chan_iax2.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * Hangup cause signalling implementation by
 * Levent Guendogdu <levon@feature-it.com>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Implementation of Inter-Asterisk eXchange Version 2
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \par See also
 * \arg \ref Config_iax
 *
 * \ingroup channel_drivers
 */

/*** MODULEINFO
   <use>zaptel</use>
        <depend>res_features</depend>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 132783 $")

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <dirent.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <signal.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <unistd.h>
#include <netdb.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <regex.h>

#ifdef HAVE_ZAPTEL
#include <sys/ioctl.h>
#include <zaptel/zaptel.h>
#endif

#include "asterisk/lock.h"
#include "asterisk/frame.h" 
#include "asterisk/channel.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/config.h"
#include "asterisk/options.h"
#include "asterisk/cli.h"
#include "asterisk/translate.h"
#include "asterisk/md5.h"
#include "asterisk/cdr.h"
#include "asterisk/crypto.h"
#include "asterisk/acl.h"
#include "asterisk/manager.h"
#include "asterisk/callerid.h"
#include "asterisk/app.h"
#include "asterisk/astdb.h"
#include "asterisk/musiconhold.h"
#include "asterisk/features.h"
#include "asterisk/utils.h"
#include "asterisk/causes.h"
#include "asterisk/localtime.h"
#include "asterisk/aes.h"
#include "asterisk/dnsmgr.h"
#include "asterisk/devicestate.h"
#include "asterisk/netsock.h"
#include "asterisk/stringfields.h"
#include "asterisk/linkedlists.h"
#include "asterisk/astobj2.h"

#include "iax2.h"
#include "iax2-parser.h"
#include "iax2-provision.h"
#include "jitterbuf.h"

/* Define SCHED_MULTITHREADED to run the scheduler in a special
   multithreaded mode. */
#define SCHED_MULTITHREADED

/* Define DEBUG_SCHED_MULTITHREADED to keep track of where each
   thread is actually doing. */
#define DEBUG_SCHED_MULTITHREAD

#ifndef IPTOS_MINCOST
#define IPTOS_MINCOST 0x02
#endif

#ifdef SO_NO_CHECK
static int nochecksums = 0;
#endif


#define PTR_TO_CALLNO(a) ((unsigned short)(unsigned long)(a))
#define CALLNO_TO_PTR(a) ((void *)(unsigned long)(a))

#define DEFAULT_THREAD_COUNT 10
#define DEFAULT_MAX_THREAD_COUNT 100
#define DEFAULT_RETRY_TIME 1000
#define MEMORY_SIZE 100
#define DEFAULT_DROP 3

#define DEBUG_SUPPORT

#define MIN_REUSE_TIME     60 /* Don't reuse a call number within 60 seconds */

/* Sample over last 100 units to determine historic jitter */
#define GAMMA (0.01)

static struct ast_codec_pref prefs;

static const char tdesc[] = "Inter Asterisk eXchange Driver (Ver 2)";

static char context[80] = "default";

static char language[MAX_LANGUAGE] = "";
static char regcontext[AST_MAX_CONTEXT] = "";

static int maxauthreq = 3;
static int max_retries = 4;
static int ping_time = 21;
static int lagrq_time = 10;
static int maxjitterbuffer=1000;
static int resyncthreshold=1000;
static int maxjitterinterps=10;
static int trunkfreq = 20;
static int authdebug = 1;
static int autokill = 0;
static int iaxcompat = 0;

static int iaxdefaultdpcache=10 * 60;  /* Cache dialplan entries for 10 minutes by default */

static int iaxdefaulttimeout = 5;      /* Default to wait no more than 5 seconds for a reply to come back */

static unsigned int tos = 0;

static int min_reg_expire;
static int max_reg_expire;

static int timingfd = -1;           /* Timing file descriptor */

static struct ast_netsock_list *netsock;
static struct ast_netsock_list *outsock;     /*!< used if sourceaddress specified and bindaddr == INADDR_ANY */
static int defaultsockfd = -1;

int (*iax2_regfunk)(const char *username, int onoff) = NULL;

/* Ethernet, etc */
#define IAX_CAPABILITY_FULLBANDWIDTH   0xFFFF
/* T1, maybe ISDN */
#define IAX_CAPABILITY_MEDBANDWIDTH    (IAX_CAPABILITY_FULLBANDWIDTH &  \
                ~AST_FORMAT_SLINEAR &        \
                ~AST_FORMAT_ULAW &        \
                ~AST_FORMAT_ALAW &        \
                ~AST_FORMAT_G722) 
/* A modem */
#define IAX_CAPABILITY_LOWBANDWIDTH (IAX_CAPABILITY_MEDBANDWIDTH &      \
                ~AST_FORMAT_G726 &        \
                ~AST_FORMAT_G726_AAL2 &      \
                ~AST_FORMAT_ADPCM)

#define IAX_CAPABILITY_LOWFREE      (IAX_CAPABILITY_LOWBANDWIDTH &      \
                ~AST_FORMAT_G723_1)


#define DEFAULT_MAXMS      2000     /* Must be faster than 2 seconds by default */
#define DEFAULT_FREQ_OK    60 * 1000   /* How often to check for the host to be up */
#define DEFAULT_FREQ_NOTOK 10 * 1000   /* How often to check, if the host is down... */

static   struct io_context *io;
static   struct sched_context *sched;

static int iax2_capability = IAX_CAPABILITY_FULLBANDWIDTH;

static int iaxdebug = 0;

static int iaxtrunkdebug = 0;

static int test_losspct = 0;
#ifdef IAXTESTS
static int test_late = 0;
static int test_resync = 0;
static int test_jit = 0;
static int test_jitpct = 0;
#endif /* IAXTESTS */

static char accountcode[AST_MAX_ACCOUNT_CODE];
static char mohinterpret[MAX_MUSICCLASS];
static char mohsuggest[MAX_MUSICCLASS];
static int amaflags = 0;
static int adsi = 0;
static int delayreject = 0;
static int iax2_encryption = 0;

static struct ast_flags globalflags = { 0 };

static pthread_t netthreadid = AST_PTHREADT_NULL;
static pthread_t schedthreadid = AST_PTHREADT_NULL;
AST_MUTEX_DEFINE_STATIC(sched_lock);
static ast_cond_t sched_cond;

enum {
   IAX_STATE_STARTED =     (1 << 0),
   IAX_STATE_AUTHENTICATED =  (1 << 1),
   IAX_STATE_TBD =      (1 << 2),
   IAX_STATE_UNCHANGED =      (1 << 3),
} iax2_state;

struct iax2_context {
   char context[AST_MAX_CONTEXT];
   struct iax2_context *next;
};

enum {
   IAX_HASCALLERID =    (1 << 0),   /*!< CallerID has been specified */
   IAX_DELME =    (1 << 1),   /*!< Needs to be deleted */
   IAX_TEMPONLY =    (1 << 2),   /*!< Temporary (realtime) */
   IAX_TRUNK =    (1 << 3),   /*!< Treat as a trunk */
   IAX_NOTRANSFER =  (1 << 4),   /*!< Don't native bridge */
   IAX_USEJITTERBUF =   (1 << 5),   /*!< Use jitter buffer */
   IAX_DYNAMIC =     (1 << 6),   /*!< dynamic peer */
   IAX_SENDANI =     (1 << 7),   /*!< Send ANI along with CallerID */
        /* (1 << 8) is currently unused due to the deprecation of an old option. Go ahead, take it! */
   IAX_ALREADYGONE = (1 << 9),   /*!< Already disconnected */
   IAX_PROVISION =      (1 << 10),  /*!< This is a provisioning request */
   IAX_QUELCH =      (1 << 11),  /*!< Whether or not we quelch audio */
   IAX_ENCRYPTED =      (1 << 12),  /*!< Whether we should assume encrypted tx/rx */
   IAX_KEYPOPULATED =   (1 << 13),  /*!< Whether we have a key populated */
   IAX_CODEC_USER_FIRST =  (1 << 14),  /*!< are we willing to let the other guy choose the codec? */
   IAX_CODEC_NOPREFS =     (1 << 15),  /*!< Force old behaviour by turning off prefs */
   IAX_CODEC_NOCAP =    (1 << 16),  /*!< only consider requested format and ignore capabilities*/
   IAX_RTCACHEFRIENDS =    (1 << 17),  /*!< let realtime stay till your reload */
   IAX_RTUPDATE =       (1 << 18),  /*!< Send a realtime update */
   IAX_RTAUTOCLEAR =    (1 << 19),  /*!< erase me on expire */ 
   IAX_FORCEJITTERBUF = (1 << 20),  /*!< Force jitterbuffer, even when bridged to a channel that can take jitter */ 
   IAX_RTIGNOREREGEXPIRE = (1 << 21),  /*!< When using realtime, ignore registration expiration */
   IAX_TRUNKTIMESTAMPS =   (1 << 22),  /*!< Send trunk timestamps */
   IAX_TRANSFERMEDIA =  (1 << 23),      /*!< When doing IAX2 transfers, transfer media only */
   IAX_MAXAUTHREQ =        (1 << 24),      /*!< Maximum outstanding AUTHREQ restriction is in place */
   IAX_DELAYPBXSTART =  (1 << 25),  /*!< Don't start a PBX on the channel until the peer sends us a
                       response, so that we've achieved a three-way handshake with
                       them before sending voice or anything else*/
   IAX_ALLOWFWDOWNLOAD = (1 << 26), /*!< Allow the FWDOWNL command? */
} iax2_flags;

static int global_rtautoclear = 120;

static int reload_config(void);
static int iax2_reload(int fd, int argc, char *argv[]);


struct iax2_user {
   AST_DECLARE_STRING_FIELDS(
      AST_STRING_FIELD(name);
      AST_STRING_FIELD(secret);
      AST_STRING_FIELD(dbsecret);
      AST_STRING_FIELD(accountcode);
      AST_STRING_FIELD(mohinterpret);
      AST_STRING_FIELD(mohsuggest);
      AST_STRING_FIELD(inkeys);               /*!< Key(s) this user can use to authenticate to us */
      AST_STRING_FIELD(language);
      AST_STRING_FIELD(cid_num);
      AST_STRING_FIELD(cid_name);
   );
   
   int authmethods;
   int encmethods;
   int amaflags;
   int adsi;
   unsigned int flags;
   int capability;
   int maxauthreq; /*!< Maximum allowed outstanding AUTHREQs */
   int curauthreq; /*!< Current number of outstanding AUTHREQs */
   struct ast_codec_pref prefs;
   struct ast_ha *ha;
   struct iax2_context *contexts;
   struct ast_variable *vars;
};

struct iax2_peer {
   AST_DECLARE_STRING_FIELDS(
      AST_STRING_FIELD(name);
      AST_STRING_FIELD(username);
      AST_STRING_FIELD(secret);
      AST_STRING_FIELD(dbsecret);
      AST_STRING_FIELD(outkey);      /*!< What key we use to talk to this peer */

      AST_STRING_FIELD(regexten);     /*!< Extension to register (if regcontext is used) */
      AST_STRING_FIELD(context);      /*!< For transfers only */
      AST_STRING_FIELD(peercontext);  /*!< Context to pass to peer */
      AST_STRING_FIELD(mailbox);     /*!< Mailbox */
      AST_STRING_FIELD(mohinterpret);
      AST_STRING_FIELD(mohsuggest);
      AST_STRING_FIELD(inkeys);     /*!< Key(s) this peer can use to authenticate to us */
      /* Suggested caller id if registering */
      AST_STRING_FIELD(cid_num);    /*!< Default context (for transfer really) */
      AST_STRING_FIELD(cid_name);      /*!< Default context (for transfer really) */
      AST_STRING_FIELD(zonetag);    /*!< Time Zone */
   );
   struct ast_codec_pref prefs;
   struct ast_dnsmgr_entry *dnsmgr;    /*!< DNS refresh manager */
   struct sockaddr_in addr;
   int formats;
   int sockfd;             /*!< Socket to use for transmission */
   struct in_addr mask;
   int adsi;
   unsigned int flags;

   /* Dynamic Registration fields */
   struct sockaddr_in defaddr;         /*!< Default address if there is one */
   int authmethods;           /*!< Authentication methods (IAX_AUTH_*) */
   int encmethods;               /*!< Encryption methods (IAX_ENCRYPT_*) */

   int expire;             /*!< Schedule entry for expiry */
   int expiry;             /*!< How soon to expire */
   int capability;               /*!< Capability */

   /* Qualification */
   int callno;             /*!< Call number of POKE request */
   int pokeexpire;               /*!< Scheduled qualification-related task (ie iax2_poke_peer_s or iax2_poke_noanswer) */
   int lastms;             /*!< How long last response took (in ms), or -1 for no response */
   int maxms;              /*!< Max ms we will accept for the host to be up, 0 to not monitor */

   int pokefreqok;               /*!< How often to check if the host is up */
   int pokefreqnotok;            /*!< How often to check when the host has been determined to be down */
   int historicms;               /*!< How long recent average responses took */
   int smoothing;             /*!< Sample over how many units to determine historic ms */
   
   struct ast_ha *ha;
};

#define IAX2_TRUNK_PREFACE (sizeof(struct iax_frame) + sizeof(struct ast_iax2_meta_hdr) + sizeof(struct ast_iax2_meta_trunk_hdr))

static struct iax2_trunk_peer {
   ast_mutex_t lock;
   int sockfd;
   struct sockaddr_in addr;
   struct timeval txtrunktime;      /*!< Transmit trunktime */
   struct timeval rxtrunktime;      /*!< Receive trunktime */
   struct timeval lasttxtime;    /*!< Last transmitted trunktime */
   struct timeval trunkact;      /*!< Last trunk activity */
   unsigned int lastsent;        /*!< Last sent time */
   /* Trunk data and length */
   unsigned char *trunkdata;
   unsigned int trunkdatalen;
   unsigned int trunkdataalloc;
   struct iax2_trunk_peer *next;
   int trunkerror;
   int calls;
} *tpeers = NULL;

AST_MUTEX_DEFINE_STATIC(tpeerlock);

struct iax_firmware {
   struct iax_firmware *next;
   int fd;
   int mmaplen;
   int dead;
   struct ast_iax2_firmware_header *fwh;
   unsigned char *buf;
};

enum iax_reg_state {
   REG_STATE_UNREGISTERED = 0,
   REG_STATE_REGSENT,
   REG_STATE_AUTHSENT,
   REG_STATE_REGISTERED,
   REG_STATE_REJECTED,
   REG_STATE_TIMEOUT,
   REG_STATE_NOAUTH
};

enum iax_transfer_state {
   TRANSFER_NONE = 0,
   TRANSFER_BEGIN,
   TRANSFER_READY,
   TRANSFER_RELEASED,
   TRANSFER_PASSTHROUGH,
   TRANSFER_MBEGIN,
   TRANSFER_MREADY,
   TRANSFER_MRELEASED,
   TRANSFER_MPASSTHROUGH,
   TRANSFER_MEDIA,
   TRANSFER_MEDIAPASS
};

struct iax2_registry {
   struct sockaddr_in addr;      /*!< Who we connect to for registration purposes */
   char username[80];
   char secret[80];        /*!< Password or key name in []'s */
   char random[80];
   int expire;          /*!< Sched ID of expiration */
   int refresh;            /*!< How often to refresh */
   enum iax_reg_state regstate;
   int messages;           /*!< Message count, low 8 bits = new, high 8 bits = old */
   int callno;          /*!< Associated call number if applicable */
   struct sockaddr_in us;        /*!< Who the server thinks we are */
   struct ast_dnsmgr_entry *dnsmgr; /*!< DNS refresh manager */
   AST_LIST_ENTRY(iax2_registry) entry;
};

static AST_LIST_HEAD_STATIC(registrations, iax2_registry);

/* Don't retry more frequently than every 10 ms, or less frequently than every 5 seconds */
#define MIN_RETRY_TIME     100
#define MAX_RETRY_TIME     10000

#define MAX_JITTER_BUFFER  50
#define MIN_JITTER_BUFFER  10

#define DEFAULT_TRUNKDATA  640 * 10 /*!< 40ms, uncompressed linear * 10 channels */
#define MAX_TRUNKDATA      640 * 200   /*!< 40ms, uncompressed linear * 200 channels */

#define MAX_TIMESTAMP_SKEW 160      /*!< maximum difference between actual and predicted ts for sending */

/* If consecutive voice frame timestamps jump by more than this many milliseconds, then jitter buffer will resync */
#define TS_GAP_FOR_JB_RESYNC  5000

static int iaxthreadcount = DEFAULT_THREAD_COUNT;
static int iaxmaxthreadcount = DEFAULT_MAX_THREAD_COUNT;
static int iaxdynamicthreadcount = 0;
static int iaxactivethreadcount = 0;

struct iax_rr {
   int jitter;
   int losspct;
   int losscnt;
   int packets;
   int delay;
   int dropped;
   int ooo;
};

struct chan_iax2_pvt {
   /*! Socket to send/receive on for this call */
   int sockfd;
   /*! Last received voice format */
   int voiceformat;
   /*! Last received video format */
   int videoformat;
   /*! Last sent voice format */
   int svoiceformat;
   /*! Last sent video format */
   int svideoformat;
   /*! What we are capable of sending */
   int capability;
   /*! Last received timestamp */
   unsigned int last;
   /*! Last sent timestamp - never send the same timestamp twice in a single call */
   unsigned int lastsent;
   /*! Timestamp of the last video frame sent */
   unsigned int lastvsent;
   /*! Next outgoing timestamp if everything is good */
   unsigned int nextpred;
   /*! True if the last voice we transmitted was not silence/CNG */
   int notsilenttx;
   /*! Ping time */
   unsigned int pingtime;
   /*! Max time for initial response */
   int maxtime;
   /*! Peer Address */
   struct sockaddr_in addr;
   /*! Actual used codec preferences */
   struct ast_codec_pref prefs;
   /*! Requested codec preferences */
   struct ast_codec_pref rprefs;
   /*! Our call number */
   unsigned short callno;
   /*! Peer callno */
   unsigned short peercallno;
   /*! Negotiated format, this is only used to remember what format was
       chosen for an unauthenticated call so that the channel can get
       created later using the right format */
   int chosenformat;
   /*! Peer selected format */
   int peerformat;
   /*! Peer capability */
   int peercapability;
   /*! timeval that we base our transmission on */
   struct timeval offset;
   /*! timeval that we base our delivery on */
   struct timeval rxcore;
   /*! The jitterbuffer */
        jitterbuf *jb;
   /*! active jb read scheduler id */
        int jbid;                       
   /*! LAG */
   int lag;
   /*! Error, as discovered by the manager */
   int error;
   /*! Owner if we have one */
   struct ast_channel *owner;
   /*! What's our state? */
   struct ast_flags state;
   /*! Expiry (optional) */
   int expiry;
   /*! Next outgoing sequence number */
   unsigned char oseqno;
   /*! Next sequence number they have not yet acknowledged */
   unsigned char rseqno;
   /*! Next incoming sequence number */
   unsigned char iseqno;
   /*! Last incoming sequence number we have acknowledged */
   unsigned char aseqno;

   AST_DECLARE_STRING_FIELDS(
      /*! Peer name */
      AST_STRING_FIELD(peer);
      /*! Default Context */
      AST_STRING_FIELD(context);
      /*! Caller ID if available */
      AST_STRING_FIELD(cid_num);
      AST_STRING_FIELD(cid_name);
      /*! Hidden Caller ID (i.e. ANI) if appropriate */
      AST_STRING_FIELD(ani);
      /*! DNID */
      AST_STRING_FIELD(dnid);
      /*! RDNIS */
      AST_STRING_FIELD(rdnis);
      /*! Requested Extension */
      AST_STRING_FIELD(exten);
      /*! Expected Username */
      AST_STRING_FIELD(username);
      /*! Expected Secret */
      AST_STRING_FIELD(secret);
      /*! MD5 challenge */
      AST_STRING_FIELD(challenge);
      /*! Public keys permitted keys for incoming authentication */
      AST_STRING_FIELD(inkeys);
      /*! Private key for outgoing authentication */
      AST_STRING_FIELD(outkey);
      /*! Preferred language */
      AST_STRING_FIELD(language);
      /*! Hostname/peername for naming purposes */
      AST_STRING_FIELD(host);

      AST_STRING_FIELD(dproot);
      AST_STRING_FIELD(accountcode);
      AST_STRING_FIELD(mohinterpret);
      AST_STRING_FIELD(mohsuggest);
   );
   
   /*! permitted authentication methods */
   int authmethods;
   /*! permitted encryption methods */
   int encmethods;
   /*! Encryption AES-128 Key */
   aes_encrypt_ctx ecx;
   /*! Decryption AES-128 Key corresponding to ecx */
   aes_decrypt_ctx mydcx;
   /*! Decryption AES-128 Key used to decrypt peer frames */
   aes_decrypt_ctx dcx;
   /*! 32 bytes of semi-random data */
   unsigned char semirand[32];
   /*! Associated registry */
   struct iax2_registry *reg;
   /*! Associated peer for poking */
   struct iax2_peer *peerpoke;
   /*! IAX_ flags */
   unsigned int flags;
   int adsi;

   /*! Transferring status */
   enum iax_transfer_state transferring;
   /*! Transfer identifier */
   int transferid;
   /*! Who we are IAX transfering to */
   struct sockaddr_in transfer;
   /*! What's the new call number for the transfer */
   unsigned short transfercallno;
   /*! Transfer decrypt AES-128 Key */
   aes_encrypt_ctx tdcx;

   /*! Status of knowledge of peer ADSI capability */
   int peeradsicpe;

   /*! Who we are bridged to */
   unsigned short bridgecallno;
   
   int pingid;       /*!< Transmit PING request */
   int lagid;        /*!< Retransmit lag request */
   int autoid;       /*!< Auto hangup for Dialplan requestor */
   int authid;       /*!< Authentication rejection ID */
   int authfail;        /*!< Reason to report failure */
   int initid;       /*!< Initial peer auto-congest ID (based on qualified peers) */
   int calling_ton;
   int calling_tns;
   int calling_pres;
   int amaflags;
   struct iax2_dpcache *dpentries;
   struct ast_variable *vars;
   /*! last received remote rr */
   struct iax_rr remote_rr;
   /*! Current base time: (just for stats) */
   int min;
   /*! Dropped frame count: (just for stats) */
   int frames_dropped;
   /*! received frame count: (just for stats) */
   int frames_received;
};

static struct ast_iax2_queue {
   AST_LIST_HEAD(, iax_frame) queue;
   int count;
} iaxq;

/*!
 * This module will get much higher performance when doing a lot of
 * user and peer lookups if the number of buckets is increased from 1.
 * However, to maintain old behavior for Asterisk 1.4, these are set to
 * 1 by default.  When using multiple buckets, search order through these
 * containers is considered random, so you will not be able to depend on
 * the order the entires are specified in iax.conf for matching order. */
#ifdef LOW_MEMORY
#define MAX_PEER_BUCKETS 1
/* #define MAX_PEER_BUCKETS 17 */
#else
#define MAX_PEER_BUCKETS 1
/* #define MAX_PEER_BUCKETS 563 */
#endif
static struct ao2_container *peers;

#define MAX_USER_BUCKETS MAX_PEER_BUCKETS
static struct ao2_container *users;

static struct ast_firmware_list {
   struct iax_firmware *wares;
   ast_mutex_t lock;
} waresl;

/*! Extension exists */
#define CACHE_FLAG_EXISTS     (1 << 0)
/*! Extension is nonexistent */
#define CACHE_FLAG_NONEXISTENT      (1 << 1)
/*! Extension can exist */
#define CACHE_FLAG_CANEXIST      (1 << 2)
/*! Waiting to hear back response */
#define CACHE_FLAG_PENDING    (1 << 3)
/*! Timed out */
#define CACHE_FLAG_TIMEOUT    (1 << 4)
/*! Request transmitted */
#define CACHE_FLAG_TRANSMITTED      (1 << 5)
/*! Timeout */
#define CACHE_FLAG_UNKNOWN    (1 << 6)
/*! Matchmore */
#define CACHE_FLAG_MATCHMORE     (1 << 7)

static struct iax2_dpcache {
   char peercontext[AST_MAX_CONTEXT];
   char exten[AST_MAX_EXTENSION];
   struct timeval orig;
   struct timeval expiry;
   int flags;
   unsigned short callno;
   int waiters[256];
   struct iax2_dpcache *next;
   struct iax2_dpcache *peer; /*!< For linking in peers */
} *dpcache;

AST_MUTEX_DEFINE_STATIC(dpcache_lock);

static void reg_source_db(struct iax2_peer *p);
static struct iax2_peer *realtime_peer(const char *peername, struct sockaddr_in *sin);

static int ast_cli_netstats(struct mansession *s, int fd, int limit_fmt);

#define IAX_IOSTATE_IDLE      0
#define IAX_IOSTATE_READY     1
#define IAX_IOSTATE_PROCESSING   2
#define IAX_IOSTATE_SCHEDREADY   3

#define IAX_TYPE_POOL    1
#define IAX_TYPE_DYNAMIC 2

struct iax2_pkt_buf {
   AST_LIST_ENTRY(iax2_pkt_buf) entry;
   size_t len;
   unsigned char buf[1];
};

struct iax2_thread {
   AST_LIST_ENTRY(iax2_thread) list;
   int type;
   int iostate;
#ifdef SCHED_MULTITHREADED
   void (*schedfunc)(const void *);
   const void *scheddata;
#endif
#ifdef DEBUG_SCHED_MULTITHREAD
   char curfunc[80];
#endif   
   int actions;
   pthread_t threadid;
   int threadnum;
   struct sockaddr_in iosin;
   unsigned char readbuf[4096]; 
   unsigned char *buf;
   ssize_t buf_len;
   size_t buf_size;
   int iofd;
   time_t checktime;
   ast_mutex_t lock;
   ast_cond_t cond;
   unsigned int ready_for_signal:1;
   /*! if this thread is processing a full frame,
     some information about that frame will be stored
     here, so we can avoid dispatching any more full
     frames for that callno to other threads */
   struct {
      unsigned short callno;
      struct sockaddr_in sin;
      unsigned char type;
      unsigned char csub;
   } ffinfo;
   /*! Queued up full frames for processing.  If more full frames arrive for
    *  a call which this thread is already processing a full frame for, they
    *  are queued up here. */
   AST_LIST_HEAD_NOLOCK(, iax2_pkt_buf) full_frames;
};

/* Thread lists */
static AST_LIST_HEAD_STATIC(idle_list, iax2_thread);
static AST_LIST_HEAD_STATIC(active_list, iax2_thread);
static AST_LIST_HEAD_STATIC(dynamic_list, iax2_thread);

static void *iax2_process_thread(void *data);

static void signal_condition(ast_mutex_t *lock, ast_cond_t *cond)
{
   ast_mutex_lock(lock);
   ast_cond_signal(cond);
   ast_mutex_unlock(lock);
}

static void iax_debug_output(const char *data)
{
   if (iaxdebug)
      ast_verbose("%s", data);
}

static void iax_error_output(const char *data)
{
   ast_log(LOG_WARNING, "%s", data);
}

static void jb_error_output(const char *fmt, ...)
{
   va_list args;
   char buf[1024];

   va_start(args, fmt);
   vsnprintf(buf, 1024, fmt, args);
   va_end(args);

   ast_log(LOG_ERROR, buf);
}

static void jb_warning_output(const char *fmt, ...)
{
   va_list args;
   char buf[1024];

   va_start(args, fmt);
   vsnprintf(buf, 1024, fmt, args);
   va_end(args);

   ast_log(LOG_WARNING, buf);
}

static void jb_debug_output(const char *fmt, ...)
{
   va_list args;
   char buf[1024];

   va_start(args, fmt);
   vsnprintf(buf, 1024, fmt, args);
   va_end(args);

   ast_verbose(buf);
}

/* XXX We probably should use a mutex when working with this XXX */
static struct chan_iax2_pvt *iaxs[IAX_MAX_CALLS];
static ast_mutex_t iaxsl[ARRAY_LEN(iaxs)];
static struct timeval lastused[ARRAY_LEN(iaxs)];

/*!
 * \brief Another container of iax2_pvt structures
 *
 * Active IAX2 pvt structs are also stored in this container, if they are a part
 * of an active call where we know the remote side's call number.  The reason
 * for this is that incoming media frames do not contain our call number.  So,
 * instead of having to iterate the entire iaxs array, we use this container to
 * look up calls where the remote side is using a given call number.
 */
static struct ao2_container *iax_peercallno_pvts;

/* Flag to use with trunk calls, keeping these calls high up.  It halves our effective use
   but keeps the division between trunked and non-trunked better. */
#define TRUNK_CALL_START   ARRAY_LEN(iaxs) / 2

static int maxtrunkcall = TRUNK_CALL_START;
static int maxnontrunkcall = 1;

static enum ast_bridge_result iax2_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc, int timeoutms);
static int expire_registry(const void *data);
static int iax2_answer(struct ast_channel *c);
static int iax2_call(struct ast_channel *c, char *dest, int timeout);
static int iax2_devicestate(void *data);
static int iax2_digit_begin(struct ast_channel *c, char digit);
static int iax2_digit_end(struct ast_channel *c, char digit, unsigned int duration);
static int iax2_do_register(struct iax2_registry *reg);
static int iax2_fixup(struct ast_channel *oldchannel, struct ast_channel *newchan);
static int iax2_hangup(struct ast_channel *c);
static int iax2_indicate(struct ast_channel *c, int condition, const void *data, size_t datalen);
static int iax2_poke_peer(struct iax2_peer *peer, int heldcall);
static int iax2_provision(struct sockaddr_in *end, int sockfd, char *dest, const char *template, int force);
static int iax2_send(struct chan_iax2_pvt *pvt, struct ast_frame *f, unsigned int ts, int seqno, int now, int transfer, int final);
static int iax2_sendhtml(struct ast_channel *c, int subclass, const char *data, int datalen);
static int iax2_sendimage(struct ast_channel *c, struct ast_frame *img);
static int iax2_sendtext(struct ast_channel *c, const char *text);
static int iax2_setoption(struct ast_channel *c, int option, void *data, int datalen);
static int iax2_transfer(struct ast_channel *c, const char *dest);
static int iax2_write(struct ast_channel *c, struct ast_frame *f);
static int send_command(struct chan_iax2_pvt *, char, int, unsigned int, const unsigned char *, int, int);
static int send_command_final(struct chan_iax2_pvt *, char, int, unsigned int, const unsigned char *, int, int);
static int send_command_immediate(struct chan_iax2_pvt *, char, int, unsigned int, const unsigned char *, int, int);
static int send_command_locked(unsigned short callno, char, int, unsigned int, const unsigned char *, int, int);
static int send_command_transfer(struct chan_iax2_pvt *, char, int, unsigned int, const unsigned char *, int);
static struct ast_channel *iax2_request(const char *type, int format, void *data, int *cause);
static struct ast_frame *iax2_read(struct ast_channel *c);
static struct iax2_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int temponly);
static struct iax2_user *build_user(const char *name, struct ast_variable *v, struct ast_variable *alt, int temponly);
static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, time_t regtime);
static void prune_peers(void);

static int decode_frame(aes_decrypt_ctx *dcx, struct ast_iax2_full_hdr *fh, struct ast_frame *f, int *datalen);
static int encrypt_frame(aes_encrypt_ctx *ecx, struct ast_iax2_full_hdr *fh, unsigned char *poo, int *datalen);
static void build_ecx_key(const unsigned char *digest, struct chan_iax2_pvt *pvt);
  
static const struct ast_channel_tech iax2_tech = {
   .type = "IAX2",
   .description = tdesc,
   .capabilities = IAX_CAPABILITY_FULLBANDWIDTH,
   .properties = AST_CHAN_TP_WANTSJITTER,
   .requester = iax2_request,
   .devicestate = iax2_devicestate,
   .send_digit_begin = iax2_digit_begin,
   .send_digit_end = iax2_digit_end,
   .send_text = iax2_sendtext,
   .send_image = iax2_sendimage,
   .send_html = iax2_sendhtml,
   .call = iax2_call,
   .hangup = iax2_hangup,
   .answer = iax2_answer,
   .read = iax2_read,
   .write = iax2_write,
   .write_video = iax2_write,
   .indicate = iax2_indicate,
   .setoption = iax2_setoption,
   .bridge = iax2_bridge,
   .transfer = iax2_transfer,
   .fixup = iax2_fixup,
};

/* WARNING: insert_idle_thread should only ever be called within the
 * context of an iax2_process_thread() thread.
 */
static void insert_idle_thread(struct iax2_thread *thread)
{
   if (thread->type == IAX_TYPE_DYNAMIC) {
      AST_LIST_LOCK(&dynamic_list);
      AST_LIST_INSERT_TAIL(&dynamic_list, thread, list);
      AST_LIST_UNLOCK(&dynamic_list);
   } else {
      AST_LIST_LOCK(&idle_list);
      AST_LIST_INSERT_TAIL(&idle_list, thread, list);
      AST_LIST_UNLOCK(&idle_list);
   }

   return;
}

static struct iax2_thread *find_idle_thread(void)
{
   pthread_attr_t attr;
   struct iax2_thread *thread = NULL;

   /* Pop the head of the list off */
   AST_LIST_LOCK(&idle_list);
   thread = AST_LIST_REMOVE_HEAD(&idle_list, list);
   AST_LIST_UNLOCK(&idle_list);

   /* If no idle thread is available from the regular list, try dynamic */
   if (thread == NULL) {
      AST_LIST_LOCK(&dynamic_list);
      thread = AST_LIST_REMOVE_HEAD(&dynamic_list, list);
      /* Make sure we absolutely have a thread... if not, try to make one if allowed */
      if (thread == NULL && iaxmaxthreadcount > iaxdynamicthreadcount) {
         /* We need to MAKE a thread! */
         if ((thread = ast_calloc(1, sizeof(*thread)))) {
            thread->threadnum = iaxdynamicthreadcount;
            thread->type = IAX_TYPE_DYNAMIC;
            ast_mutex_init(&thread->lock);
            ast_cond_init(&thread->cond, NULL);
            pthread_attr_init(&attr);
            pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);   
            if (ast_pthread_create(&thread->threadid, &attr, iax2_process_thread, thread)) {
               free(thread);
               thread = NULL;
            } else {
               /* All went well and the thread is up, so increment our count */
               iaxdynamicthreadcount++;
               
               /* Wait for the thread to be ready before returning it to the caller */
               while (!thread->ready_for_signal)
                  usleep(1);
            }
         }
      }
      AST_LIST_UNLOCK(&dynamic_list);
   }

   /* this thread is not processing a full frame (since it is idle),
      so ensure that the field for the full frame call number is empty */
   if (thread)
      memset(&thread->ffinfo, 0, sizeof(thread->ffinfo));

   return thread;
}

#ifdef SCHED_MULTITHREADED
static int __schedule_action(void (*func)(const void *data), const void *data, const char *funcname)
{
   struct iax2_thread *thread = NULL;
   static time_t lasterror;
   static time_t t;

   thread = find_idle_thread();

   if (thread != NULL) {
      thread->schedfunc = func;
      thread->scheddata = data;
      thread->iostate = IAX_IOSTATE_SCHEDREADY;
#ifdef DEBUG_SCHED_MULTITHREAD
      ast_copy_string(thread->curfunc, funcname, sizeof(thread->curfunc));
#endif
      signal_condition(&thread->lock, &thread->cond);
      return 0;
   }
   time(&t);
   if (t != lasterror && option_debug) 
      ast_log(LOG_DEBUG, "Out of idle IAX2 threads for scheduling!\n");
   lasterror = t;

   return -1;
}
#define schedule_action(func, data) __schedule_action(func, data, __PRETTY_FUNCTION__)
#endif

static int iax2_sched_add(struct sched_context *con, int when, ast_sched_cb callback, const void *data)
{
   int res;

   res = ast_sched_add(con, when, callback, data);
   signal_condition(&sched_lock, &sched_cond);

   return res;
}

static int send_ping(const void *data);

static void __send_ping(const void *data)
{
   int callno = (long) data;

   ast_mutex_lock(&iaxsl[callno]);

   while (iaxs[callno] && iaxs[callno]->pingid != -1) {
      if (iaxs[callno]->peercallno) {
         send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_PING, 0, NULL, 0, -1);
      }
      iaxs[callno]->pingid = iax2_sched_add(sched, ping_time * 1000, send_ping, data);
      break;
   }

   ast_mutex_unlock(&iaxsl[callno]);
}

static int send_ping(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__send_ping, data))
#endif      
      __send_ping(data);
   return 0;
}

static int get_encrypt_methods(const char *s)
{
   int e;
   if (!strcasecmp(s, "aes128"))
      e = IAX_ENCRYPT_AES128;
   else if (ast_true(s))
      e = IAX_ENCRYPT_AES128;
   else
      e = 0;
   return e;
}

static int send_lagrq(const void *data);

static void __send_lagrq(const void *data)
{
   int callno = (long) data;

   ast_mutex_lock(&iaxsl[callno]);

   while (iaxs[callno] && iaxs[callno]->lagid > -1) {
      if (iaxs[callno]->peercallno) {
         send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_LAGRQ, 0, NULL, 0, -1);
      }
      iaxs[callno]->lagid = iax2_sched_add(sched, lagrq_time * 1000, send_lagrq, data);
      break;
   }

   ast_mutex_unlock(&iaxsl[callno]);
}

static int send_lagrq(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__send_lagrq, data))
#endif      
      __send_lagrq(data);
   return 0;
}

static unsigned char compress_subclass(int subclass)
{
   int x;
   int power=-1;
   /* If it's 128 or smaller, just return it */
   if (subclass < IAX_FLAG_SC_LOG)
      return subclass;
   /* Otherwise find its power */
   for (x = 0; x < IAX_MAX_SHIFT; x++) {
      if (subclass & (1 << x)) {
         if (power > -1) {
            ast_log(LOG_WARNING, "Can't compress subclass %d\n", subclass);
            return 0;
         } else
            power = x;
      }
   }
   return power | IAX_FLAG_SC_LOG;
}

static int uncompress_subclass(unsigned char csub)
{
   /* If the SC_LOG flag is set, return 2^csub otherwise csub */
   if (csub & IAX_FLAG_SC_LOG) {
      /* special case for 'compressed' -1 */
      if (csub == 0xff)
         return -1;
      else
         return 1 << (csub & ~IAX_FLAG_SC_LOG & IAX_MAX_SHIFT);
   }
   else
      return csub;
}

/*!
 * \note The only member of the peer passed here guaranteed to be set is the name field
 */
static int peer_hash_cb(const void *obj, const int flags)
{
   const struct iax2_peer *peer = obj;

   return ast_str_hash(peer->name);
}

/*!
 * \note The only member of the peer passed here guaranteed to be set is the name field
 */
static int peer_cmp_cb(void *obj, void *arg, int flags)
{
   struct iax2_peer *peer = obj, *peer2 = arg;

   return !strcasecmp(peer->name, peer2->name) ? CMP_MATCH : 0;
}

/*!
 * \note The only member of the user passed here guaranteed to be set is the name field
 */
static int user_hash_cb(const void *obj, const int flags)
{
   const struct iax2_user *user = obj;

   return ast_str_hash(user->name);
}

/*!
 * \note The only member of the user passed here guaranteed to be set is the name field
 */
static int user_cmp_cb(void *obj, void *arg, int flags)
{
   struct iax2_user *user = obj, *user2 = arg;

   return !strcasecmp(user->name, user2->name) ? CMP_MATCH : 0;
}

/*!
 * \note This funtion calls realtime_peer -> reg_source_db -> iax2_poke_peer -> find_callno,
 *       so do not call it with a pvt lock held.
 */
static struct iax2_peer *find_peer(const char *name, int realtime) 
{
   struct iax2_peer *peer = NULL;
   struct iax2_peer tmp_peer = {
      .name = name,
   };

   peer = ao2_find(peers, &tmp_peer, OBJ_POINTER);

   /* Now go for realtime if applicable */
   if(!peer && realtime)
      peer = realtime_peer(name, NULL);

   return peer;
}

static struct iax2_peer *peer_ref(struct iax2_peer *peer)
{
   ao2_ref(peer, +1);
   return peer;
}

static inline struct iax2_peer *peer_unref(struct iax2_peer *peer)
{
   ao2_ref(peer, -1);
   return NULL;
}

static inline struct iax2_user *user_ref(struct iax2_user *user)
{
   ao2_ref(user, +1);
   return user;
}

static inline struct iax2_user *user_unref(struct iax2_user *user)
{
   ao2_ref(user, -1);
   return NULL;
}

static int iax2_getpeername(struct sockaddr_in sin, char *host, int len)
{
   struct iax2_peer *peer = NULL;
   int res = 0;
   struct ao2_iterator i;

   i = ao2_iterator_init(peers, 0);
   while ((peer = ao2_iterator_next(&i))) {
      if ((peer->addr.sin_addr.s_addr == sin.sin_addr.s_addr) &&
          (peer->addr.sin_port == sin.sin_port)) {
         ast_copy_string(host, peer->name, len);
         peer_unref(peer);
         res = 1;
         break;
      }
      peer_unref(peer);
   }

   if (!peer) {
      peer = realtime_peer(NULL, &sin);
      if (peer) {
         ast_copy_string(host, peer->name, len);
         peer_unref(peer);
         res = 1;
      }
   }

   return res;
}

static void iax2_destroy_helper(struct chan_iax2_pvt *pvt)
{
   /* Decrement AUTHREQ count if needed */
   if (ast_test_flag(pvt, IAX_MAXAUTHREQ)) {
      struct iax2_user *user;
      struct iax2_user tmp_user = {
         .name = pvt->username,
      };

      user = ao2_find(users, &tmp_user, OBJ_POINTER);
      if (user) {
         ast_atomic_fetchadd_int(&user->curauthreq, -1);
         user = user_unref(user);       
      }

      ast_clear_flag(pvt, IAX_MAXAUTHREQ);
   }

   /* No more pings or lagrq's */
   AST_SCHED_DEL(sched, pvt->pingid);
   AST_SCHED_DEL(sched, pvt->lagid);
   AST_SCHED_DEL(sched, pvt->autoid);
   AST_SCHED_DEL(sched, pvt->authid);
   AST_SCHED_DEL(sched, pvt->initid);
   AST_SCHED_DEL(sched, pvt->jbid);
}

static void store_by_peercallno(struct chan_iax2_pvt *pvt)
{
   if (!pvt->peercallno) {
      ast_log(LOG_ERROR, "This should not be called without a peer call number.\n");
      return;
   }

   ao2_link(iax_peercallno_pvts, pvt);
}

static void remove_by_peercallno(struct chan_iax2_pvt *pvt)
{
   if (!pvt->peercallno) {
      ast_log(LOG_ERROR, "This should not be called without a peer call number.\n");
      return;
   }

   ao2_unlink(iax_peercallno_pvts, pvt);
}

static void update_max_trunk(void)
{
   int max = TRUNK_CALL_START;
   int x;

   /* XXX Prolly don't need locks here XXX */
   for (x = TRUNK_CALL_START; x < ARRAY_LEN(iaxs) - 1; x++) {
      if (iaxs[x]) {
         max = x + 1;
      }
   }

   maxtrunkcall = max;
   if (option_debug && iaxdebug)
      ast_log(LOG_DEBUG, "New max trunk callno is %d\n", max);
}

static void iax2_frame_free(struct iax_frame *fr)
{
   AST_SCHED_DEL(sched, fr->retrans);
   iax_frame_free(fr);
}

static void iax2_destroy(int callno)
{
   struct chan_iax2_pvt *pvt;
   struct ast_channel *owner;

retry:
   pvt = iaxs[callno];
   gettimeofday(&lastused[callno], NULL);
   
   owner = pvt ? pvt->owner : NULL;

   if (owner) {
      if (ast_mutex_trylock(&owner->lock)) {
         if (option_debug > 2)
            ast_log(LOG_DEBUG, "Avoiding IAX destroy deadlock\n");
         DEADLOCK_AVOIDANCE(&iaxsl[callno]);
         goto retry;
      }
   }
   if (!owner) {
      iaxs[callno] = NULL;
   }

   if (pvt) {
      if (!owner) {
         pvt->owner = NULL;
      } else {
         /* If there's an owner, prod it to give up */
         /* It is ok to use ast_queue_hangup() here instead of iax2_queue_hangup()
          * because we already hold the owner channel lock. */
         ast_queue_hangup(owner);
      }

      if (pvt->peercallno) {
         remove_by_peercallno(pvt);
      }

      if (!owner) {
         ao2_ref(pvt, -1);
         pvt = NULL;
      }
   }

   if (owner) {
      ast_mutex_unlock(&owner->lock);
   }

   if (callno & 0x4000) {
      update_max_trunk();
   }
}

static void pvt_destructor(void *obj)
{
   struct chan_iax2_pvt *pvt = obj;
   struct iax_frame *cur = NULL;

   iax2_destroy_helper(pvt);

   /* Already gone */
   ast_set_flag(pvt, IAX_ALREADYGONE); 

   AST_LIST_LOCK(&iaxq.queue);
   AST_LIST_TRAVERSE(&iaxq.queue, cur, list) {
      /* Cancel any pending transmissions */
      if (cur->callno == pvt->callno) { 
         cur->retries = -1;
      }
   }
   AST_LIST_UNLOCK(&iaxq.queue);

   if (pvt->reg) {
      pvt->reg->callno = 0;
   }

   if (!pvt->owner) {
      jb_frame frame;
      if (pvt->vars) {
          ast_variables_destroy(pvt->vars);
          pvt->vars = NULL;
      }

      while (jb_getall(pvt->jb, &frame) == JB_OK) {
         iax2_frame_free(frame.data);
      }

      jb_destroy(pvt->jb);
      ast_string_field_free_memory(pvt);
   }
}

static struct chan_iax2_pvt *new_iax(struct sockaddr_in *sin, const char *host)
{
   struct chan_iax2_pvt *tmp;
   jb_conf jbconf;

   if (!(tmp = ao2_alloc(sizeof(*tmp), pvt_destructor))) {
      return NULL;
   }

   if (ast_string_field_init(tmp, 32)) {
      ao2_ref(tmp, -1);
      tmp = NULL;
      return NULL;
   }
      
   tmp->prefs = prefs;
   tmp->callno = 0;
   tmp->peercallno = 0;
   tmp->transfercallno = 0;
   tmp->bridgecallno = 0;
   tmp->pingid = -1;
   tmp->lagid = -1;
   tmp->autoid = -1;
   tmp->authid = -1;
   tmp->initid = -1;

   ast_string_field_set(tmp,exten, "s");
   ast_string_field_set(tmp,host, host);

   tmp->jb = jb_new();
   tmp->jbid = -1;
   jbconf.max_jitterbuf = maxjitterbuffer;
   jbconf.resync_threshold = resyncthreshold;
   jbconf.max_contig_interp = maxjitterinterps;
   jb_setconf(tmp->jb,&jbconf);

   return tmp;
}

static struct iax_frame *iaxfrdup2(struct iax_frame *fr)
{
   struct iax_frame *new = iax_frame_new(DIRECTION_INGRESS, fr->af.datalen, fr->cacheable);
   if (new) {
      size_t afdatalen = new->afdatalen;
      memcpy(new, fr, sizeof(*new));
      iax_frame_wrap(new, &fr->af);
      new->afdatalen = afdatalen;
      new->data = NULL;
      new->datalen = 0;
      new->direction = DIRECTION_INGRESS;
      new->retrans = -1;
   }
   return new;
}

#define NEW_PREVENT  0
#define NEW_ALLOW    1
#define NEW_FORCE    2

static int match(struct sockaddr_in *sin, unsigned short callno, unsigned short dcallno, struct chan_iax2_pvt *cur, int check_dcallno)
{
   if ((cur->addr.sin_addr.s_addr == sin->sin_addr.s_addr) &&
      (cur->addr.sin_port == sin->sin_port)) {
      /* This is the main host */
      if ( (cur->peercallno == 0 || cur->peercallno == callno) &&
          (check_dcallno ? dcallno == cur->callno : 1) ) {
         /* That's us.  Be sure we keep track of the peer call number */
         return 1;
      }
   }
   if ((cur->transfer.sin_addr.s_addr == sin->sin_addr.s_addr) &&
       (cur->transfer.sin_port == sin->sin_port) && (cur->transferring)) {
      /* We're transferring */
      if ((dcallno == cur->callno) || (cur->transferring == TRANSFER_MEDIAPASS && cur->transfercallno == callno))
         return 1;
   }
   return 0;
}

static void update_max_nontrunk(void)
{
   int max = 1;
   int x;
   /* XXX Prolly don't need locks here XXX */
   for (x=1;x<TRUNK_CALL_START - 1; x++) {
      if (iaxs[x])
         max = x + 1;
   }
   maxnontrunkcall = max;
   if (option_debug && iaxdebug)
      ast_log(LOG_DEBUG, "New max nontrunk callno is %d\n", max);
}

static int make_trunk(unsigned short callno, int locked)
{
   int x;
   int res= 0;
   struct timeval now;
   if (iaxs[callno]->oseqno) {
      ast_log(LOG_WARNING, "Can't make trunk once a call has started!\n");
      return -1;
   }
   if (callno & TRUNK_CALL_START) {
      ast_log(LOG_WARNING, "Call %d is already a trunk\n", callno);
      return -1;
   }
   gettimeofday(&now, NULL);
   for (x = TRUNK_CALL_START; x < ARRAY_LEN(iaxs) - 1; x++) {
      ast_mutex_lock(&iaxsl[x]);
      if (!iaxs[x] && ((now.tv_sec - lastused[x].tv_sec) > MIN_REUSE_TIME)) {
         iaxs[x] = iaxs[callno];
         iaxs[x]->callno = x;
         iaxs[callno] = NULL;
         /* Update the two timers that should have been started */
         AST_SCHED_DEL(sched, iaxs[x]->pingid);
         AST_SCHED_DEL(sched, iaxs[x]->lagid);
         iaxs[x]->pingid = iax2_sched_add(sched, ping_time * 1000, send_ping, (void *)(long)x);
         iaxs[x]->lagid = iax2_sched_add(sched, lagrq_time * 1000, send_lagrq, (void *)(long)x);
         if (locked)
            ast_mutex_unlock(&iaxsl[callno]);
         res = x;
         if (!locked)
            ast_mutex_unlock(&iaxsl[x]);
         break;
      }
      ast_mutex_unlock(&iaxsl[x]);
   }
   if (x >= ARRAY_LEN(iaxs) - 1) {
      ast_log(LOG_WARNING, "Unable to trunk call: Insufficient space\n");
      return -1;
   }
   if (option_debug)
      ast_log(LOG_DEBUG, "Made call %d into trunk call %d\n", callno, x);
   /* We move this call from a non-trunked to a trunked call */
   update_max_trunk();
   update_max_nontrunk();
   return res;
}

/*!
 * \note Calling this function while holding another pvt lock can cause a deadlock.
 */
static int __find_callno(unsigned short callno, unsigned short dcallno, struct sockaddr_in *sin, int new, int sockfd, int return_locked, int check_dcallno)
{
   int res = 0;
   int x;
   struct timeval now;
   char host[80];

   if (new <= NEW_ALLOW) {
      if (callno) {
         struct chan_iax2_pvt *pvt;
         struct chan_iax2_pvt tmp_pvt = {
            .callno = dcallno,
            .peercallno = callno,
            /* hack!! */
            .frames_received = check_dcallno,
         };
 
         memcpy(&tmp_pvt.addr, sin, sizeof(tmp_pvt.addr));
 
         if ((pvt = ao2_find(iax_peercallno_pvts, &tmp_pvt, OBJ_POINTER))) {
            if (return_locked) {
               ast_mutex_lock(&iaxsl[pvt->callno]);
            }
            res = pvt->callno;
            ao2_ref(pvt, -1);
            pvt = NULL;
            return res;
         }
      }

      /* Look for an existing connection first */
      for (x = 1; !res && x < maxnontrunkcall; x++) {
         ast_mutex_lock(&iaxsl[x]);
         if (iaxs[x]) {
            /* Look for an exact match */
            if (match(sin, callno, dcallno, iaxs[x], check_dcallno)) {
               res = x;
            }
         }
         if (!res || !return_locked)
            ast_mutex_unlock(&iaxsl[x]);
      }
      for (x = TRUNK_CALL_START; !res && x < maxtrunkcall; x++) {
         ast_mutex_lock(&iaxsl[x]);
         if (iaxs[x]) {
            /* Look for an exact match */
            if (match(sin, callno, dcallno, iaxs[x], check_dcallno)) {
               res = x;
            }
         }
         if (!res || !return_locked)
            ast_mutex_unlock(&iaxsl[x]);
      }
   }
   if (!res && (new >= NEW_ALLOW)) {
      int start, found = 0;

      /* It may seem odd that we look through the peer list for a name for
       * this *incoming* call.  Well, it is weird.  However, users don't
       * have an IP address/port number that we can match against.  So,
       * this is just checking for a peer that has that IP/port and
       * assuming that we have a user of the same name.  This isn't always
       * correct, but it will be changed if needed after authentication. */
      if (!iax2_getpeername(*sin, host, sizeof(host)))
         snprintf(host, sizeof(host), "%s:%d", ast_inet_ntoa(sin->sin_addr), ntohs(sin->sin_port));

      now = ast_tvnow();
      start = 2 + (ast_random() % (TRUNK_CALL_START - 1));
      for (x = start; 1; x++) {
         if (x == TRUNK_CALL_START) {
            x = 1;
            continue;
         }

         /* Find first unused call number that hasn't been used in a while */
         ast_mutex_lock(&iaxsl[x]);
         if (!iaxs[x] && ((now.tv_sec - lastused[x].tv_sec) > MIN_REUSE_TIME)) {
            found = 1;
            break;
         }
         ast_mutex_unlock(&iaxsl[x]);
         
         if (x == start - 1) {
            break;
         }
      }
      /* We've still got lock held if we found a spot */
      if (x == start - 1 && !found) {
         ast_log(LOG_WARNING, "No more space\n");
         return 0;
      }
      iaxs[x] = new_iax(sin, host);
      update_max_nontrunk();
      if (iaxs[x]) {
         if (option_debug && iaxdebug)
            ast_log(LOG_DEBUG, "Creating new call structure %d\n", x);
         iaxs[x]->sockfd = sockfd;
         iaxs[x]->addr.sin_port = sin->sin_port;
         iaxs[x]->addr.sin_family = sin->sin_family;
         iaxs[x]->addr.sin_addr.s_addr = sin->sin_addr.s_addr;
         iaxs[x]->peercallno = callno;
         iaxs[x]->callno = x;
         iaxs[x]->pingtime = DEFAULT_RETRY_TIME;
         iaxs[x]->expiry = min_reg_expire;
         iaxs[x]->pingid = iax2_sched_add(sched, ping_time * 1000, send_ping, (void *)(long)x);
         iaxs[x]->lagid = iax2_sched_add(sched, lagrq_time * 1000, send_lagrq, (void *)(long)x);
         iaxs[x]->amaflags = amaflags;
         ast_copy_flags(iaxs[x], (&globalflags), IAX_NOTRANSFER | IAX_TRANSFERMEDIA | IAX_USEJITTERBUF | IAX_FORCEJITTERBUF);
         
         ast_string_field_set(iaxs[x], accountcode, accountcode);
         ast_string_field_set(iaxs[x], mohinterpret, mohinterpret);
         ast_string_field_set(iaxs[x], mohsuggest, mohsuggest);

         if (iaxs[x]->peercallno) {
            store_by_peercallno(iaxs[x]);
         }
      } else {
         ast_log(LOG_WARNING, "Out of resources\n");
         ast_mutex_unlock(&iaxsl[x]);
         return 0;
      }
      if (!return_locked)
         ast_mutex_unlock(&iaxsl[x]);
      res = x;
   }
   return res;
}

static int find_callno(unsigned short callno, unsigned short dcallno, struct sockaddr_in *sin, int new, int sockfd, int full_frame) {

   return __find_callno(callno, dcallno, sin, new, sockfd, 0, full_frame);
}

static int find_callno_locked(unsigned short callno, unsigned short dcallno, struct sockaddr_in *sin, int new, int sockfd, int full_frame) {

   return __find_callno(callno, dcallno, sin, new, sockfd, 1, full_frame);
}

/*!
 * \brief Queue a frame to a call's owning asterisk channel
 *
 * \pre This function assumes that iaxsl[callno] is locked when called.
 *
 * \note IMPORTANT NOTE!!! Any time this function is used, even if iaxs[callno]
 * was valid before calling it, it may no longer be valid after calling it.
 * This function may unlock and lock the mutex associated with this callno,
 * meaning that another thread may grab it and destroy the call.
 */
static int iax2_queue_frame(int callno, struct ast_frame *f)
{
   for (;;) {
      if (iaxs[callno] && iaxs[callno]->owner) {
         if (ast_mutex_trylock(&iaxs[callno]->owner->lock)) {
            /* Avoid deadlock by pausing and trying again */
            DEADLOCK_AVOIDANCE(&iaxsl[callno]);
         } else {
            ast_queue_frame(iaxs[callno]->owner, f);
            ast_mutex_unlock(&iaxs[callno]->owner->lock);
            break;
         }
      } else
         break;
   }
   return 0;
}

/*!
 * \brief Queue a hangup frame on the ast_channel owner
 *
 * This function queues a hangup frame on the owner of the IAX2 pvt struct that
 * is active for the given call number.
 *
 * \pre Assumes lock for callno is already held.
 *
 * \note IMPORTANT NOTE!!! Any time this function is used, even if iaxs[callno]
 * was valid before calling it, it may no longer be valid after calling it.
 * This function may unlock and lock the mutex associated with this callno,
 * meaning that another thread may grab it and destroy the call.
 */
static int iax2_queue_hangup(int callno)
{
   for (;;) {
      if (iaxs[callno] && iaxs[callno]->owner) {
         if (ast_mutex_trylock(&iaxs[callno]->owner->lock)) {
            /* Avoid deadlock by pausing and trying again */
            DEADLOCK_AVOIDANCE(&iaxsl[callno]);
         } else {
            ast_queue_hangup(iaxs[callno]->owner);
            ast_mutex_unlock(&iaxs[callno]->owner->lock);
            break;
         }
      } else
         break;
   }
   return 0;
}

/*!
 * \brief Queue a control frame on the ast_channel owner
 *
 * This function queues a control frame on the owner of the IAX2 pvt struct that
 * is active for the given call number.
 *
 * \pre Assumes lock for callno is already held.
 *
 * \note IMPORTANT NOTE!!! Any time this function is used, even if iaxs[callno]
 * was valid before calling it, it may no longer be valid after calling it.
 * This function may unlock and lock the mutex associated with this callno,
 * meaning that another thread may grab it and destroy the call.
 */
static int iax2_queue_control_data(int callno, 
   enum ast_control_frame_type control, const void *data, size_t datalen)
{
   for (;;) {
      if (iaxs[callno] && iaxs[callno]->owner) {
         if (ast_mutex_trylock(&iaxs[callno]->owner->lock)) {
            /* Avoid deadlock by pausing and trying again */
            DEADLOCK_AVOIDANCE(&iaxsl[callno]);
         } else {
            ast_queue_control_data(iaxs[callno]->owner, control, data, datalen);
            ast_mutex_unlock(&iaxs[callno]->owner->lock);
            break;
         }
      } else
         break;
   }
   return 0;
}
static void destroy_firmware(struct iax_firmware *cur)
{
   /* Close firmware */
   if (cur->fwh) {
      munmap((void*)cur->fwh, ntohl(cur->fwh->datalen) + sizeof(*(cur->fwh)));
   }
   close(cur->fd);
   free(cur);
}

static int try_firmware(char *s)
{
   struct stat stbuf;
   struct iax_firmware *cur;
   int ifd;
   int fd;
   int res;
   
   struct ast_iax2_firmware_header *fwh, fwh2;
   struct MD5Context md5;
   unsigned char sum[16];
   unsigned char buf[1024];
   int len, chunk;
   char *s2;
   char *last;
   s2 = alloca(strlen(s) + 100);
   if (!s2) {
      ast_log(LOG_WARNING, "Alloca failed!\n");
      return -1;
   }
   last = strrchr(s, '/');
   if (last)
      last++;
   else
      last = s;
   snprintf(s2, strlen(s) + 100, "/var/tmp/%s-%ld", last, (unsigned long)ast_random());
   res = stat(s, &stbuf);
   if (res < 0) {
      ast_log(LOG_WARNING, "Failed to stat '%s': %s\n", s, strerror(errno));
      return -1;
   }
   /* Make sure it's not a directory */
   if (S_ISDIR(stbuf.st_mode))
      return -1;
   ifd = open(s, O_RDONLY);
   if (ifd < 0) {
      ast_log(LOG_WARNING, "Cannot open '%s': %s\n", s, strerror(errno));
      return -1;
   }
   fd = open(s2, O_RDWR | O_CREAT | O_EXCL, 0600);
   if (fd < 0) {
      ast_log(LOG_WARNING, "Cannot open '%s' for writing: %s\n", s2, strerror(errno));
      close(ifd);
      return -1;
   }
   /* Unlink our newly created file */
   unlink(s2);
   
   /* Now copy the firmware into it */
   len = stbuf.st_size;
   while(len) {
      chunk = len;
      if (chunk > sizeof(buf))
         chunk = sizeof(buf);
      res = read(ifd, buf, chunk);
      if (res != chunk) {
         ast_log(LOG_WARNING, "Only read %d of %d bytes of data :(: %s\n", res, chunk, strerror(errno));
         close(ifd);
         close(fd);
         return -1;
      }
      res = write(fd, buf, chunk);
      if (res != chunk) {
         ast_log(LOG_WARNING, "Only write %d of %d bytes of data :(: %s\n", res, chunk, strerror(errno));
         close(ifd);
         close(fd);
         return -1;
      }
      len -= chunk;
   }
   close(ifd);
   /* Return to the beginning */
   lseek(fd, 0, SEEK_SET);
   if ((res = read(fd, &fwh2, sizeof(fwh2))) != sizeof(fwh2)) {
      ast_log(LOG_WARNING, "Unable to read firmware header in '%s'\n", s);
      close(fd);
      return -1;
   }
   if (ntohl(fwh2.magic) != IAX_FIRMWARE_MAGIC) {
      ast_log(LOG_WARNING, "'%s' is not a valid firmware file\n", s);
      close(fd);
      return -1;
   }
   if (ntohl(fwh2.datalen) != (stbuf.st_size - sizeof(fwh2))) {
      ast_log(LOG_WARNING, "Invalid data length in firmware '%s'\n", s);
      close(fd);
      return -1;
   }
   if (fwh2.devname[sizeof(fwh2.devname) - 1] || ast_strlen_zero((char *)fwh2.devname)) {
      ast_log(LOG_WARNING, "No or invalid device type specified for '%s'\n", s);
      close(fd);
      return -1;
   }
   fwh = (struct ast_iax2_firmware_header*)mmap(NULL, stbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); 
   if (fwh == (void *) -1) {
      ast_log(LOG_WARNING, "mmap failed: %s\n", strerror(errno));
      close(fd);
      return -1;
   }
   MD5Init(&md5);
   MD5Update(&md5, fwh->data, ntohl(fwh->datalen));
   MD5Final(sum, &md5);
   if (memcmp(sum, fwh->chksum, sizeof(sum))) {
      ast_log(LOG_WARNING, "Firmware file '%s' fails checksum\n", s);
      munmap((void*)fwh, stbuf.st_size);
      close(fd);
      return -1;
   }
   cur = waresl.wares;
   while(cur) {
      if (!strcmp((char *)cur->fwh->devname, (char *)fwh->devname)) {
         /* Found a candidate */
         if (cur->dead || (ntohs(cur->fwh->version) < ntohs(fwh->version)))
            /* The version we have on loaded is older, load this one instead */
            break;
         /* This version is no newer than what we have.  Don't worry about it.
            We'll consider it a proper load anyhow though */
         munmap((void*)fwh, stbuf.st_size);
         close(fd);
         return 0;
      }
      cur = cur->next;
   }
   if (!cur) {
      /* Allocate a new one and link it */
      if ((cur = ast_calloc(1, sizeof(*cur)))) {
         cur->fd = -1;
         cur->next = waresl.wares;
         waresl.wares = cur;
      }
   }
   if (cur) {
      if (cur->fwh) {
         munmap((void*)cur->fwh, cur->mmaplen);
      }
      if (cur->fd > -1)
         close(cur->fd);
      cur->fwh = fwh;
      cur->fd = fd;
      cur->mmaplen = stbuf.st_size;
      cur->dead = 0;
   }
   return 0;
}

static int iax_check_version(char *dev)
{
   int res = 0;
   struct iax_firmware *cur;
   if (!ast_strlen_zero(dev)) {
      ast_mutex_lock(&waresl.lock);
      cur = waresl.wares;
      while(cur) {
         if (!strcmp(dev, (char *)cur->fwh->devname)) {
            res = ntohs(cur->fwh->version);
            break;
         }
         cur = cur->next;
      }
      ast_mutex_unlock(&waresl.lock);
   }
   return res;
}

static int iax_firmware_append(struct iax_ie_data *ied, const unsigned char *dev, unsigned int desc)
{
   int res = -1;
   unsigned int bs = desc & 0xff;
   unsigned int start = (desc >> 8) & 0xffffff;
   unsigned int bytes;
   struct iax_firmware *cur;
   if (!ast_strlen_zero((char *)dev) && bs) {
      start *= bs;
      ast_mutex_lock(&waresl.lock);
      cur = waresl.wares;
      while(cur) {
         if (!strcmp((char *)dev, (char *)cur->fwh->devname)) {
            iax_ie_append_int(ied, IAX_IE_FWBLOCKDESC, desc);
            if (start < ntohl(cur->fwh->datalen)) {
               bytes = ntohl(cur->fwh->datalen) - start;
               if (bytes > bs)
                  bytes = bs;
               iax_ie_append_raw(ied, IAX_IE_FWBLOCKDATA, cur->fwh->data + start, bytes);
            } else {
               bytes = 0;
               iax_ie_append(ied, IAX_IE_FWBLOCKDATA);
            }
            if (bytes == bs)
               res = 0;
            else
               res = 1;
            break;
         }
         cur = cur->next;
      }
      ast_mutex_unlock(&waresl.lock);
   }
   return res;
}


static void reload_firmware(int unload)
{
   struct iax_firmware *cur, *curl, *curp;
   DIR *fwd;
   struct dirent *de;
   char dir[256];
   char fn[256];
   /* Mark all as dead */
   ast_mutex_lock(&waresl.lock);
   cur = waresl.wares;
   while(cur) {
      cur->dead = 1;
      cur = cur->next;
   }

   /* Now that we've freed them, load the new ones */
   if (!unload) {
      snprintf(dir, sizeof(dir), "%s/firmware/iax", (char *)ast_config_AST_DATA_DIR);
      fwd = opendir(dir);
      if (fwd) {
         while((de = readdir(fwd))) {
            if (de->d_name[0] != '.') {
               snprintf(fn, sizeof(fn), "%s/%s", dir, de->d_name);
               if (!try_firmware(fn)) {
                  if (option_verbose > 1)
                     ast_verbose(VERBOSE_PREFIX_2 "Loaded firmware '%s'\n", de->d_name);
               }
            }
         }
         closedir(fwd);
      } else 
         ast_log(LOG_WARNING, "Error opening firmware directory '%s': %s\n", dir, strerror(errno));
   }

   /* Clean up leftovers */
   cur = waresl.wares;
   curp = NULL;
   while(cur) {
      curl = cur;
      cur = cur->next;
      if (curl->dead) {
         if (curp) {
            curp->next = cur;
         } else {
            waresl.wares = cur;
         }
         destroy_firmware(curl);
      } else {
         curp = cur;
      }
   }
   ast_mutex_unlock(&waresl.lock);
}

/*!
 * \note This function assumes that iaxsl[callno] is locked when called.
 *
 * \note IMPORTANT NOTE!!! Any time this function is used, even if iaxs[callno]
 * was valid before calling it, it may no longer be valid after calling it.
 * This function calls iax2_queue_frame(), which may unlock and lock the mutex 
 * associated with this callno, meaning that another thread may grab it and destroy the call.
 */
static int __do_deliver(void *data)
{
   /* Just deliver the packet by using queueing.  This is called by
     the IAX thread with the iaxsl lock held. */
   struct iax_frame *fr = data;
   fr->retrans = -1;
   ast_clear_flag(&fr->af, AST_FRFLAG_HAS_TIMING_INFO);
   if (iaxs[fr->callno] && !ast_test_flag(iaxs[fr->callno], IAX_ALREADYGONE))
      iax2_queue_frame(fr->callno, &fr->af);
   /* Free our iax frame */
   iax2_frame_free(fr);
   /* And don't run again */
   return 0;
}

static int handle_error(void)
{
   /* XXX Ideally we should figure out why an error occured and then abort those
      rather than continuing to try.  Unfortunately, the published interface does
      not seem to work XXX */
#if 0
   struct sockaddr_in *sin;
   int res;
   struct msghdr m;
   struct sock_extended_err e;
   m.msg_name = NULL;
   m.msg_namelen = 0;
   m.msg_iov = NULL;
   m.msg_control = &e;
   m.msg_controllen = sizeof(e);
   m.msg_flags = 0;
   res = recvmsg(netsocket, &m, MSG_ERRQUEUE);
   if (res < 0)
      ast_log(LOG_WARNING, "Error detected, but unable to read error: %s\n", strerror(errno));
   else {
      if (m.msg_controllen) {
         sin = (struct sockaddr_in *)SO_EE_OFFENDER(&e);
         if (sin) 
            ast_log(LOG_WARNING, "Receive error from %s\n", ast_inet_ntoa(sin->sin_addr));
         else
            ast_log(LOG_WARNING, "No address detected??\n");
      } else {
         ast_log(LOG_WARNING, "Local error: %s\n", strerror(e.ee_errno));
      }
   }
#endif
   return 0;
}

static int transmit_trunk(struct iax_frame *f, struct sockaddr_in *sin, int sockfd)
{
   int res;
   res = sendto(sockfd, f->data, f->datalen, 0,(struct sockaddr *)sin,
               sizeof(*sin));
   if (res < 0) {
      if (option_debug)
         ast_log(LOG_DEBUG, "Received error: %s\n", strerror(errno));
      handle_error();
   } else
      res = 0;
   return res;
}

static int send_packet(struct iax_frame *f)
{
   int res;
   int callno = f->callno;

   /* Don't send if there was an error, but return error instead */
   if (!callno || !iaxs[callno] || iaxs[callno]->error)
       return -1;
   
   /* Called with iaxsl held */
   if (option_debug > 2 && iaxdebug)
      ast_log(LOG_DEBUG, "Sending %d on %d/%d to %s:%d\n", f->ts, callno, iaxs[callno]->peercallno, ast_inet_ntoa(iaxs[callno]->addr.sin_addr), ntohs(iaxs[callno]->addr.sin_port));
   if (f->transfer) {
      if (iaxdebug)
         iax_showframe(f, NULL, 0, &iaxs[callno]->transfer, f->datalen - sizeof(struct ast_iax2_full_hdr));
      res = sendto(iaxs[callno]->sockfd, f->data, f->datalen, 0,(struct sockaddr *)&iaxs[callno]->transfer,
               sizeof(iaxs[callno]->transfer));
   } else {
      if (iaxdebug)
         iax_showframe(f, NULL, 0, &iaxs[callno]->addr, f->datalen - sizeof(struct ast_iax2_full_hdr));
      res = sendto(iaxs[callno]->sockfd, f->data, f->datalen, 0,(struct sockaddr *)&iaxs[callno]->addr,
               sizeof(iaxs[callno]->addr));
   }
   if (res < 0) {
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Received error: %s\n", strerror(errno));
      handle_error();
   } else
      res = 0;
   return res;
}

/*!
 * \note Since this function calls iax2_queue_hangup(), the pvt struct
 *       for the given call number may disappear during its execution.
 */
static int iax2_predestroy(int callno)
{
   struct ast_channel *c;
   struct chan_iax2_pvt *pvt = iaxs[callno];

   if (!pvt)
      return -1;
   if (!ast_test_flag(pvt, IAX_ALREADYGONE)) {
      iax2_destroy_helper(pvt);
      ast_set_flag(pvt, IAX_ALREADYGONE); 
   }
   c = pvt->owner;
   if (c) {
      c->tech_pvt = NULL;
      iax2_queue_hangup(callno);
      pvt->owner = NULL;
      ast_module_unref(ast_module_info->self);
   }
   return 0;
}

static int update_packet(struct iax_frame *f)
{
   /* Called with iaxsl lock held, and iaxs[callno] non-NULL */
   struct ast_iax2_full_hdr *fh = f->data;
   struct ast_frame af;

   /* if frame is encrypted. decrypt before updating it. */
   if (f->encmethods) {
      decode_frame(&f->mydcx, fh, &af, &f->datalen);
   }
   /* Mark this as a retransmission */
   fh->dcallno = ntohs(IAX_FLAG_RETRANS | f->dcallno);
   /* Update iseqno */
   f->iseqno = iaxs[f->callno]->iseqno;
   fh->iseqno = f->iseqno;

   /* Now re-encrypt the frame */
   if (f->encmethods) {
      encrypt_frame(&f->ecx, fh, f->semirand, &f->datalen);
   }
   return 0;
}

static int attempt_transmit(const void *data);
static void __attempt_transmit(const void *data)
{
   /* Attempt to transmit the frame to the remote peer...
      Called without iaxsl held. */
   struct iax_frame *f = (struct iax_frame *)data;
   int freeme=0;
   int callno = f->callno;
   /* Make sure this call is still active */
   if (callno) 
      ast_mutex_lock(&iaxsl[callno]);
   if (callno && iaxs[callno]) {
      if ((f->retries < 0) /* Already ACK'd */ ||
          (f->retries >= max_retries) /* Too many attempts */) {
            /* Record an error if we've transmitted too many times */
            if (f->retries >= max_retries) {
               if (f->transfer) {
                  /* Transfer timeout */
                  send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_TXREJ, 0, NULL, 0, -1);
               } else if (f->final) {
                  if (f->final) 
                     iax2_destroy(callno);
               } else {
                  if (iaxs[callno]->owner)
                     ast_log(LOG_WARNING, "Max retries exceeded to host %s on %s (type = %d, subclass = %d, ts=%d, seqno=%d)\n", ast_inet_ntoa(iaxs[f->callno]->addr.sin_addr),iaxs[f->callno]->owner->name , f->af.frametype, f->af.subclass, f->ts, f->oseqno);
                  iaxs[callno]->error = ETIMEDOUT;
                  if (iaxs[callno]->owner) {
                     struct ast_frame fr = { 0, };
                     /* Hangup the fd */
                     fr.frametype = AST_FRAME_CONTROL;
                     fr.subclass = AST_CONTROL_HANGUP;
                     iax2_queue_frame(callno, &fr); // XXX
                     /* Remember, owner could disappear */
                     if (iaxs[callno] && iaxs[callno]->owner)
                        iaxs[callno]->owner->hangupcause = AST_CAUSE_DESTINATION_OUT_OF_ORDER;
                  } else {
                     if (iaxs[callno]->reg) {
                        memset(&iaxs[callno]->reg->us, 0, sizeof(iaxs[callno]->reg->us));
                        iaxs[callno]->reg->regstate = REG_STATE_TIMEOUT;
                        iaxs[callno]->reg->refresh = IAX_DEFAULT_REG_EXPIRE;
                     }
                     iax2_destroy(callno);
                  }
               }

            }
            freeme++;
      } else {
         /* Update it if it needs it */
         update_packet(f);
         /* Attempt transmission */
         send_packet(f);
         f->retries++;
         /* Try again later after 10 times as long */
         f->retrytime *= 10;
         if (f->retrytime > MAX_RETRY_TIME)
            f->retrytime = MAX_RETRY_TIME;
         /* Transfer messages max out at one second */
         if (f->transfer && (f->retrytime > 1000))
            f->retrytime = 1000;
         f->retrans = iax2_sched_add(sched, f->retrytime, attempt_transmit, f);
      }
   } else {
      /* Make sure it gets freed */
      f->retries = -1;
      freeme++;
   }
   if (callno)
      ast_mutex_unlock(&iaxsl[callno]);
   /* Do not try again */
   if (freeme) {
      /* Don't attempt delivery, just remove it from the queue */
      AST_LIST_LOCK(&iaxq.queue);
      AST_LIST_REMOVE(&iaxq.queue, f, list);
      iaxq.count--;
      AST_LIST_UNLOCK(&iaxq.queue);
      f->retrans = -1;
      /* Free the IAX frame */
      iax2_frame_free(f);
   }
}

static int attempt_transmit(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__attempt_transmit, data))
#endif      
      __attempt_transmit(data);
   return 0;
}

static int iax2_prune_realtime(int fd, int argc, char *argv[])
{
   struct iax2_peer *peer;

   if (argc != 4)
        return RESULT_SHOWUSAGE;
   if (!strcmp(argv[3],"all")) {
      reload_config();
      ast_cli(fd, "OK cache is flushed.\n");
   } else if ((peer = find_peer(argv[3], 0))) {
      if(ast_test_flag(peer, IAX_RTCACHEFRIENDS)) {
         ast_set_flag(peer, IAX_RTAUTOCLEAR);
         expire_registry(peer_ref(peer));
         ast_cli(fd, "OK peer %s was removed from the cache.\n", argv[3]);
      } else {
         ast_cli(fd, "SORRY peer %s is not eligible for this operation.\n", argv[3]);
      }
      peer_unref(peer);
   } else {
      ast_cli(fd, "SORRY peer %s was not found in the cache.\n", argv[3]);
   }
   
   return RESULT_SUCCESS;
}

static int iax2_test_losspct(int fd, int argc, char *argv[])
{
       if (argc != 4)
               return RESULT_SHOWUSAGE;

       test_losspct = atoi(argv[3]);

       return RESULT_SUCCESS;
}

#ifdef IAXTESTS
static int iax2_test_late(int fd, int argc, char *argv[])
{
   if (argc != 4)
      return RESULT_SHOWUSAGE;

   test_late = atoi(argv[3]);

   return RESULT_SUCCESS;
}

static int iax2_test_resync(int fd, int argc, char *argv[])
{
   if (argc != 4)
      return RESULT_SHOWUSAGE;

   test_resync = atoi(argv[3]);

   return RESULT_SUCCESS;
}

static int iax2_test_jitter(int fd, int argc, char *argv[])
{
   if (argc < 4 || argc > 5)
      return RESULT_SHOWUSAGE;

   test_jit = atoi(argv[3]);
   if (argc == 5) 
      test_jitpct = atoi(argv[4]);

   return RESULT_SUCCESS;
}
#endif /* IAXTESTS */

/*! \brief  peer_status: Report Peer status in character string */
/*    returns 1 if peer is online, -1 if unmonitored */
static int peer_status(struct iax2_peer *peer, char *status, int statuslen)
{
   int res = 0;
   if (peer->maxms) {
      if (peer->lastms < 0) {
         ast_copy_string(status, "UNREACHABLE", statuslen);
      } else if (peer->lastms > peer->maxms) {
         snprintf(status, statuslen, "LAGGED (%d ms)", peer->lastms);
         res = 1;
      } else if (peer->lastms) {
         snprintf(status, statuslen, "OK (%d ms)", peer->lastms);
         res = 1;
      } else {
         ast_copy_string(status, "UNKNOWN", statuslen);
      }
   } else { 
      ast_copy_string(status, "Unmonitored", statuslen);
      res = -1;
   }
   return res;
}

/*! \brief Show one peer in detail */
static int iax2_show_peer(int fd, int argc, char *argv[])
{
   char status[30];
   char cbuf[256];
   struct iax2_peer *peer;
   char codec_buf[512];
   int x = 0, codec = 0, load_realtime = 0;

   if (argc < 4)
      return RESULT_SHOWUSAGE;

   load_realtime = (argc == 5 && !strcmp(argv[4], "load")) ? 1 : 0;

   peer = find_peer(argv[3], load_realtime);
   if (peer) {
      ast_cli(fd,"\n\n");
      ast_cli(fd, "  * Name       : %s\n", peer->name);
      ast_cli(fd, "  Secret       : %s\n", ast_strlen_zero(peer->secret)?"<Not set>":"<Set>");
      ast_cli(fd, "  Context      : %s\n", peer->context);
      ast_cli(fd, "  Mailbox      : %s\n", peer->mailbox);
      ast_cli(fd, "  Dynamic      : %s\n", ast_test_flag(peer, IAX_DYNAMIC) ? "Yes":"No");
      ast_cli(fd, "  Callerid     : %s\n", ast_callerid_merge(cbuf, sizeof(cbuf), peer->cid_name, peer->cid_num, "<unspecified>"));
      ast_cli(fd, "  Expire       : %d\n", peer->expire);
      ast_cli(fd, "  ACL          : %s\n", (peer->ha?"Yes":"No"));
      ast_cli(fd, "  Addr->IP     : %s Port %d\n",  peer->addr.sin_addr.s_addr ? ast_inet_ntoa(peer->addr.sin_addr) : "(Unspecified)", ntohs(peer->addr.sin_port));
      ast_cli(fd, "  Defaddr->IP  : %s Port %d\n", ast_inet_ntoa(peer->defaddr.sin_addr), ntohs(peer->defaddr.sin_port));
      ast_cli(fd, "  Username     : %s\n", peer->username);
      ast_cli(fd, "  Codecs       : ");
      ast_getformatname_multiple(codec_buf, sizeof(codec_buf) -1, peer->capability);
      ast_cli(fd, "%s\n", codec_buf);

      ast_cli(fd, "  Codec Order  : (");
      for(x = 0; x < 32 ; x++) {
         codec = ast_codec_pref_index(&peer->prefs,x);
         if(!codec)
            break;
         ast_cli(fd, "%s", ast_getformatname(codec));
         if(x < 31 && ast_codec_pref_index(&peer->prefs,x+1))
            ast_cli(fd, "|");
      }

      if (!x)
         ast_cli(fd, "none");
      ast_cli(fd, ")\n");

      ast_cli(fd, "  Status       : ");
      peer_status(peer, status, sizeof(status));   
      ast_cli(fd, "%s\n",status);
      ast_cli(fd, "  Qualify      : every %dms when OK, every %dms when UNREACHABLE (sample smoothing %s)\n", peer->pokefreqok, peer->pokefreqnotok, peer->smoothing ? "On" : "Off");
      ast_cli(fd,"\n");
      peer_unref(peer);
   } else {
      ast_cli(fd,"Peer %s not found.\n", argv[3]);
      ast_cli(fd,"\n");
   }

   return RESULT_SUCCESS;
}

static char *complete_iax2_show_peer(const char *line, const char *word, int pos, int state)
{
   int which = 0;
   struct iax2_peer *peer;
   char *res = NULL;
   int wordlen = strlen(word);
   struct ao2_iterator i;

   /* 0 - iax2; 1 - show; 2 - peer; 3 - <peername> */
   if (pos != 3)
      return NULL;

   i = ao2_iterator_init(peers, 0);
   while ((peer = ao2_iterator_next(&i))) {
      if (!strncasecmp(peer->name, word, wordlen) && ++which > state) {
         res = ast_strdup(peer->name);
         peer_unref(peer);
         break;
      }
      peer_unref(peer);
   }

   return res;
}

static int iax2_show_stats(int fd, int argc, char *argv[])
{
   struct iax_frame *cur;
   int cnt = 0, dead=0, final=0;

   if (argc != 3)
      return RESULT_SHOWUSAGE;

   AST_LIST_LOCK(&iaxq.queue);
   AST_LIST_TRAVERSE(&iaxq.queue, cur, list) {
      if (cur->retries < 0)
         dead++;
      if (cur->final)
         final++;
      cnt++;
   }
   AST_LIST_UNLOCK(&iaxq.queue);

   ast_cli(fd, "    IAX Statistics\n");
   ast_cli(fd, "---------------------\n");
   ast_cli(fd, "Outstanding frames: %d (%d ingress, %d egress)\n", iax_get_frames(), iax_get_iframes(), iax_get_oframes());
   ast_cli(fd, "Packets in transmit queue: %d dead, %d final, %d total\n\n", dead, final, cnt);
   
   return RESULT_SUCCESS;
}

static int iax2_show_cache(int fd, int argc, char *argv[])
{
   struct iax2_dpcache *dp;
   char tmp[1024], *pc;
   int s;
   int x,y;
   struct timeval tv;
   gettimeofday(&tv, NULL);
   ast_mutex_lock(&dpcache_lock);
   dp = dpcache;
   ast_cli(fd, "%-20.20s %-12.12s %-9.9s %-8.8s %s\n", "Peer/Context", "Exten", "Exp.", "Wait.", "Flags");
   while(dp) {
      s = dp->expiry.tv_sec - tv.tv_sec;
      tmp[0] = '\0';
      if (dp->flags & CACHE_FLAG_EXISTS)
         strncat(tmp, "EXISTS|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_NONEXISTENT)
         strncat(tmp, "NONEXISTENT|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_CANEXIST)
         strncat(tmp, "CANEXIST|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_PENDING)
         strncat(tmp, "PENDING|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_TIMEOUT)
         strncat(tmp, "TIMEOUT|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_TRANSMITTED)
         strncat(tmp, "TRANSMITTED|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_MATCHMORE)
         strncat(tmp, "MATCHMORE|", sizeof(tmp) - strlen(tmp) - 1);
      if (dp->flags & CACHE_FLAG_UNKNOWN)
         strncat(tmp, "UNKNOWN|", sizeof(tmp) - strlen(tmp) - 1);
      /* Trim trailing pipe */
      if (!ast_strlen_zero(tmp))
         tmp[strlen(tmp) - 1] = '\0';
      else
         ast_copy_string(tmp, "(none)", sizeof(tmp));
      y=0;
      pc = strchr(dp->peercontext, '@');
      if (!pc)
         pc = dp->peercontext;
      else
         pc++;
      for (x=0;x<sizeof(dp->waiters) / sizeof(dp->waiters[0]); x++)
         if (dp->waiters[x] > -1)
            y++;
      if (s > 0)
         ast_cli(fd, "%-20.20s %-12.12s %-9d %-8d %s\n", pc, dp->exten, s, y, tmp);
      else
         ast_cli(fd, "%-20.20s %-12.12s %-9.9s %-8d %s\n", pc, dp->exten, "(expired)", y, tmp);
      dp = dp->next;
   }
   ast_mutex_unlock(&dpcache_lock);
   return RESULT_SUCCESS;
}

static unsigned int calc_rxstamp(struct chan_iax2_pvt *p, unsigned int offset);

static void unwrap_timestamp(struct iax_frame *fr)
{
   int x;

   if ( (fr->ts & 0xFFFF0000) == (iaxs[fr->callno]->last & 0xFFFF0000) ) {
      x = fr->ts - iaxs[fr->callno]->last;
      if (x < -50000) {
         /* Sudden big jump backwards in timestamp:
            What likely happened here is that miniframe timestamp has circled but we haven't
            gotten the update from the main packet.  We'll just pretend that we did, and
            update the timestamp appropriately. */
         fr->ts = ( (iaxs[fr->callno]->last & 0xFFFF0000) + 0x10000) | (fr->ts & 0xFFFF);
         if (option_debug && iaxdebug)
            ast_log(LOG_DEBUG, "schedule_delivery: pushed forward timestamp\n");
      }
      if (x > 50000) {
         /* Sudden apparent big jump forwards in timestamp:
            What's likely happened is this is an old miniframe belonging to the previous
            top-16-bit timestamp that has turned up out of order.
            Adjust the timestamp appropriately. */
         fr->ts = ( (iaxs[fr->callno]->last & 0xFFFF0000) - 0x10000) | (fr->ts & 0xFFFF);
         if (option_debug && iaxdebug)
            ast_log(LOG_DEBUG, "schedule_delivery: pushed back timestamp\n");
      }
   }
}

static int get_from_jb(const void *p);

static void update_jbsched(struct chan_iax2_pvt *pvt)
{
   int when;
   
   when = ast_tvdiff_ms(ast_tvnow(), pvt->rxcore);
   
   when = jb_next(pvt->jb) - when;

   AST_SCHED_DEL(sched, pvt->jbid);

   if(when <= 0) {
      /* XXX should really just empty until when > 0.. */
      when = 1;
   }
   
   pvt->jbid = iax2_sched_add(sched, when, get_from_jb, CALLNO_TO_PTR(pvt->callno));
}

static void __get_from_jb(const void *p) 
{
   int callno = PTR_TO_CALLNO(p);
   struct chan_iax2_pvt *pvt = NULL;
   struct iax_frame *fr;
   jb_frame frame;
   int ret;
   long now;
   long next;
   struct timeval tv;
   
   /* Make sure we have a valid private structure before going on */
   ast_mutex_lock(&iaxsl[callno]);
   pvt = iaxs[callno];
   if (!pvt) {
      /* No go! */
      ast_mutex_unlock(&iaxsl[callno]);
      return;
   }

   pvt->jbid = -1;
   
   gettimeofday(&tv,NULL);
   /* round up a millisecond since ast_sched_runq does; */
   /* prevents us from spinning while waiting for our now */
   /* to catch up with runq's now */
   tv.tv_usec += 1000;
   
   now = ast_tvdiff_ms(tv, pvt->rxcore);
   
   if(now >= (next = jb_next(pvt->jb))) {
      ret = jb_get(pvt->jb,&frame,now,ast_codec_interp_len(pvt->voiceformat));
      switch(ret) {
      case JB_OK:
         fr = frame.data;
         __do_deliver(fr);
         /* __do_deliver() can cause the call to disappear */
         pvt = iaxs[callno];
         break;
      case JB_INTERP:
      {
         struct ast_frame af = { 0, };
         
         /* create an interpolation frame */
         af.frametype = AST_FRAME_VOICE;
         af.subclass = pvt->voiceformat;
         af.samples  = frame.ms * 8;
         af.src  = "IAX2 JB interpolation";
         af.delivery = ast_tvadd(pvt->rxcore, ast_samp2tv(next, 1000));
         af.offset = AST_FRIENDLY_OFFSET;
         
         /* queue the frame:  For consistency, we would call __do_deliver here, but __do_deliver wants an iax_frame,
          * which we'd need to malloc, and then it would free it.  That seems like a drag */
         if (!ast_test_flag(iaxs[callno], IAX_ALREADYGONE)) {
            iax2_queue_frame(callno, &af);
            /* iax2_queue_frame() could cause the call to disappear */
            pvt = iaxs[callno];
         }
      }
         break;
      case JB_DROP:
         iax2_frame_free(frame.data);
         break;
      case JB_NOFRAME:
      case JB_EMPTY:
         /* do nothing */
         break;
      default:
         /* shouldn't happen */
         break;
      }
   }
   if (pvt)
      update_jbsched(pvt);
   ast_mutex_unlock(&iaxsl[callno]);
}

static int get_from_jb(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__get_from_jb, data))
#endif      
      __get_from_jb(data);
   return 0;
}

/*!
 * \note This function assumes fr->callno is locked
 *
 * \note IMPORTANT NOTE!!! Any time this function is used, even if iaxs[callno]
 * was valid before calling it, it may no longer be valid after calling it.
 */
static int schedule_delivery(struct iax_frame *fr, int updatehistory, int fromtrunk, unsigned int *tsout)
{
   int type, len;
   int ret;
   int needfree = 0;
   struct ast_channel *owner = NULL;
   struct ast_channel *bridge = NULL;
   
   /* Attempt to recover wrapped timestamps */
   unwrap_timestamp(fr);

   /* delivery time is sender's sent timestamp converted back into absolute time according to our clock */
   if ( !fromtrunk && !ast_tvzero(iaxs[fr->callno]->rxcore))
      fr->af.delivery = ast_tvadd(iaxs[fr->callno]->rxcore, ast_samp2tv(fr->ts, 1000));
   else {
#if 0
      if (option_debug)
         ast_log(LOG_DEBUG, "schedule_delivery: set delivery to 0 as we don't have an rxcore yet, or frame is from trunk.\n");
#endif
      fr->af.delivery = ast_tv(0,0);
   }

   type = JB_TYPE_CONTROL;
   len = 0;

   if(fr->af.frametype == AST_FRAME_VOICE) {
      type = JB_TYPE_VOICE;
      len = ast_codec_get_samples(&fr->af) / 8;
   } else if(fr->af.frametype == AST_FRAME_CNG) {
      type = JB_TYPE_SILENCE;
   }

   if ( (!ast_test_flag(iaxs[fr->callno], IAX_USEJITTERBUF)) ) {
      if (tsout)
         *tsout = fr->ts;
      __do_deliver(fr);
      return -1;
   }

   if ((owner = iaxs[fr->callno]->owner))
      bridge = ast_bridged_channel(owner);

   /* if the user hasn't requested we force the use of the jitterbuffer, and we're bridged to
    * a channel that can accept jitter, then flush and suspend the jb, and send this frame straight through */
   if ( (!ast_test_flag(iaxs[fr->callno], IAX_FORCEJITTERBUF)) && owner && bridge && (bridge->tech->properties & AST_CHAN_TP_WANTSJITTER) ) {
      jb_frame frame;

      /* deliver any frames in the jb */
      while (jb_getall(iaxs[fr->callno]->jb, &frame) == JB_OK) {
         __do_deliver(frame.data);
         /* __do_deliver() can make the call disappear */
         if (!iaxs[fr->callno])
            return -1;
      }

      jb_reset(iaxs[fr->callno]->jb);

      AST_SCHED_DEL(sched, iaxs[fr->callno]->jbid);

      /* deliver this frame now */
      if (tsout)
         *tsout = fr->ts;
      __do_deliver(fr);
      return -1;
   }

   /* insert into jitterbuffer */
   /* TODO: Perhaps we could act immediately if it's not droppable and late */
   ret = jb_put(iaxs[fr->callno]->jb, fr, type, len, fr->ts,
         calc_rxstamp(iaxs[fr->callno],fr->ts));
   if (ret == JB_DROP) {
      needfree++;
   } else if (ret == JB_SCHED) {
      update_jbsched(iaxs[fr->callno]);
   }
   if (tsout)
      *tsout = fr->ts;
   if (needfree) {
      /* Free our iax frame */
      iax2_frame_free(fr);
      return -1;
   }
   return 0;
}

static int iax2_transmit(struct iax_frame *fr)
{
   /* Lock the queue and place this packet at the end */
   /* By setting this to 0, the network thread will send it for us, and
      queue retransmission if necessary */
   fr->sentyet = 0;
   AST_LIST_LOCK(&iaxq.queue);
   AST_LIST_INSERT_TAIL(&iaxq.queue, fr, list);
   iaxq.count++;
   AST_LIST_UNLOCK(&iaxq.queue);
   /* Wake up the network and scheduler thread */
   if (netthreadid != AST_PTHREADT_NULL)
      pthread_kill(netthreadid, SIGURG);
   signal_condition(&sched_lock, &sched_cond);
   return 0;
}



static int iax2_digit_begin(struct ast_channel *c, char digit)
{
   return send_command_locked(PTR_TO_CALLNO(c->tech_pvt), AST_FRAME_DTMF_BEGIN, digit, 0, NULL, 0, -1);
}

static int iax2_digit_end(struct ast_channel *c, char digit, unsigned int duration)
{
   return send_command_locked(PTR_TO_CALLNO(c->tech_pvt), AST_FRAME_DTMF_END, digit, 0, NULL, 0, -1);
}

static int iax2_sendtext(struct ast_channel *c, const char *text)
{
   
   return send_command_locked(PTR_TO_CALLNO(c->tech_pvt), AST_FRAME_TEXT,
      0, 0, (unsigned char *)text, strlen(text) + 1, -1);
}

static int iax2_sendimage(struct ast_channel *c, struct ast_frame *img)
{
   return send_command_locked(PTR_TO_CALLNO(c->tech_pvt), AST_FRAME_IMAGE, img->subclass, 0, img->data, img->datalen, -1);
}

static int iax2_sendhtml(struct ast_channel *c, int subclass, const char *data, int datalen)
{
   return send_command_locked(PTR_TO_CALLNO(c->tech_pvt), AST_FRAME_HTML, subclass, 0, (unsigned char *)data, datalen, -1);
}

static int iax2_fixup(struct ast_channel *oldchannel, struct ast_channel *newchan)
{
   unsigned short callno = PTR_TO_CALLNO(newchan->tech_pvt);
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno])
      iaxs[callno]->owner = newchan;
   else
      ast_log(LOG_WARNING, "Uh, this isn't a good sign...\n");
   ast_mutex_unlock(&iaxsl[callno]);
   return 0;
}

/*!
 * \note This function calls reg_source_db -> iax2_poke_peer -> find_callno,
 *       so do not call this with a pvt lock held.
 */
static struct iax2_peer *realtime_peer(const char *peername, struct sockaddr_in *sin)
{
   struct ast_variable *var = NULL;
   struct ast_variable *tmp;
   struct iax2_peer *peer=NULL;
   time_t regseconds = 0, nowtime;
   int dynamic=0;

   if (peername) {
      var = ast_load_realtime("iaxpeers", "name", peername, "host", "dynamic", NULL);
      if (!var && sin)
         var = ast_load_realtime("iaxpeers", "name", peername, "host", ast_inet_ntoa(sin->sin_addr), NULL);
   } else if (sin) {
      char porta[25];
      sprintf(porta, "%d", ntohs(sin->sin_port));
      var = ast_load_realtime("iaxpeers", "ipaddr", ast_inet_ntoa(sin->sin_addr), "port", porta, NULL);
      if (var) {
         /* We'll need the peer name in order to build the structure! */
         for (tmp = var; tmp; tmp = tmp->next) {
            if (!strcasecmp(tmp->name, "name"))
               peername = tmp->value;
         }
      }
   }
   if (!var && peername) { /* Last ditch effort */
      var = ast_load_realtime("iaxpeers", "name", peername, NULL);
      /*!\note
       * If this one loaded something, then we need to ensure that the host
       * field matched.  The only reason why we can't have this as a criteria
       * is because we only have the IP address and the host field might be
       * set as a name (and the reverse PTR might not match).
       */
      if (var && sin) {
         for (tmp = var; tmp; tmp = tmp->next) {
            if (!strcasecmp(tmp->name, "host")) {
               struct ast_hostent ahp;
               struct hostent *hp;
               if (!(hp = ast_gethostbyname(tmp->value, &ahp)) || (memcmp(&hp->h_addr, &sin->sin_addr, sizeof(hp->h_addr)))) {
                  /* No match */
                  ast_variables_destroy(var);
                  var = NULL;
               }
               break;
            }
         }
      }
   }
   if (!var)
      return NULL;

   peer = build_peer(peername, var, NULL, ast_test_flag((&globalflags), IAX_RTCACHEFRIENDS) ? 0 : 1);
   
   if (!peer) {
      ast_variables_destroy(var);
      return NULL;
   }

   for (tmp = var; tmp; tmp = tmp->next) {
      /* Make sure it's not a user only... */
      if (!strcasecmp(tmp->name, "type")) {
         if (strcasecmp(tmp->value, "friend") &&
             strcasecmp(tmp->value, "peer")) {
            /* Whoops, we weren't supposed to exist! */
            peer = peer_unref(peer);
            break;
         } 
      } else if (!strcasecmp(tmp->name, "regseconds")) {
         ast_get_time_t(tmp->value, &regseconds, 0, NULL);
      } else if (!strcasecmp(tmp->name, "ipaddr")) {
         inet_aton(tmp->value, &(peer->addr.sin_addr));
      } else if (!strcasecmp(tmp->name, "port")) {
         peer->addr.sin_port = htons(atoi(tmp->value));
      } else if (!strcasecmp(tmp->name, "host")) {
         if (!strcasecmp(tmp->value, "dynamic"))
            dynamic = 1;
      }
   }

   ast_variables_destroy(var);

   if (!peer)
      return NULL;

   if (ast_test_flag((&globalflags), IAX_RTCACHEFRIENDS)) {
      ast_copy_flags(peer, &globalflags, IAX_RTAUTOCLEAR|IAX_RTCACHEFRIENDS);
      if (ast_test_flag(peer, IAX_RTAUTOCLEAR)) {
         if (peer->expire > -1) {
            if (!ast_sched_del(sched, peer->expire)) {
               peer->expire = -1;
               peer_unref(peer);
            }
         }
         peer->expire = iax2_sched_add(sched, (global_rtautoclear) * 1000, expire_registry, peer_ref(peer));
         if (peer->expire == -1)
            peer_unref(peer);
      }
      ao2_link(peers, peer);
      if (ast_test_flag(peer, IAX_DYNAMIC))
         reg_source_db(peer);
   } else {
      ast_set_flag(peer, IAX_TEMPONLY);   
   }

   if (!ast_test_flag(&globalflags, IAX_RTIGNOREREGEXPIRE) && dynamic) {
      time(&nowtime);
      if ((nowtime - regseconds) > IAX_DEFAULT_REG_EXPIRE) {
         memset(&peer->addr, 0, sizeof(peer->addr));
         realtime_update_peer(peer->name, &peer->addr, 0);
         if (option_debug)
            ast_log(LOG_DEBUG, "realtime_peer: Bah, '%s' is expired (%d/%d/%d)!\n",
                  peername, (int)(nowtime - regseconds), (int)regseconds, (int)nowtime);
      }
      else {
         if (option_debug)
            ast_log(LOG_DEBUG, "realtime_peer: Registration for '%s' still active (%d/%d/%d)!\n",
                  peername, (int)(nowtime - regseconds), (int)regseconds, (int)nowtime);
      }
   }

   return peer;
}

static struct iax2_user *realtime_user(const char *username, struct sockaddr_in *sin)
{
   struct ast_variable *var;
   struct ast_variable *tmp;
   struct iax2_user *user=NULL;

   var = ast_load_realtime("iaxusers", "name", username, "host", "dynamic", NULL);
   if (!var)
      var = ast_load_realtime("iaxusers", "name", username, "host", ast_inet_ntoa(sin->sin_addr), NULL);
   if (!var && sin) {
      char porta[6];
      snprintf(porta, sizeof(porta), "%d", ntohs(sin->sin_port));
      var = ast_load_realtime("iaxusers", "name", username, "ipaddr", ast_inet_ntoa(sin->sin_addr), "port", porta, NULL);
      if (!var)
         var = ast_load_realtime("iaxusers", "ipaddr", ast_inet_ntoa(sin->sin_addr), "port", porta, NULL);
   }
   if (!var) { /* Last ditch effort */
      var = ast_load_realtime("iaxusers", "name", username, NULL);
      /*!\note
       * If this one loaded something, then we need to ensure that the host
       * field matched.  The only reason why we can't have this as a criteria
       * is because we only have the IP address and the host field might be
       * set as a name (and the reverse PTR might not match).
       */
      if (var) {
         for (tmp = var; tmp; tmp = tmp->next) {
            if (!strcasecmp(tmp->name, "host")) {
               struct ast_hostent ahp;
               struct hostent *hp;
               if (!(hp = ast_gethostbyname(tmp->value, &ahp)) || (memcmp(&hp->h_addr, &sin->sin_addr, sizeof(hp->h_addr)))) {
                  /* No match */
                  ast_variables_destroy(var);
                  var = NULL;
               }
               break;
            }
         }
      }
   }
   if (!var)
      return NULL;

   tmp = var;
   while(tmp) {
      /* Make sure it's not a peer only... */
      if (!strcasecmp(tmp->name, "type")) {
         if (strcasecmp(tmp->value, "friend") &&
             strcasecmp(tmp->value, "user")) {
            return NULL;
         } 
      }
      tmp = tmp->next;
   }

   user = build_user(username, var, NULL, !ast_test_flag((&globalflags), IAX_RTCACHEFRIENDS));

   ast_variables_destroy(var);

   if (!user)
      return NULL;

   if (ast_test_flag((&globalflags), IAX_RTCACHEFRIENDS)) {
      ast_set_flag(user, IAX_RTCACHEFRIENDS);
      ao2_link(users, user);
   } else {
      ast_set_flag(user, IAX_TEMPONLY);   
   }

   return user;
}

static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, time_t regtime)
{
   char port[10];
   char regseconds[20];
   
   snprintf(regseconds, sizeof(regseconds), "%d", (int)regtime);
   snprintf(port, sizeof(port), "%d", ntohs(sin->sin_port));
   ast_update_realtime("iaxpeers", "name", peername, 
      "ipaddr", ast_inet_ntoa(sin->sin_addr), "port", port, 
      "regseconds", regseconds, NULL);
}

struct create_addr_info {
   int capability;
   unsigned int flags;
   int maxtime;
   int encmethods;
   int found;
   int sockfd;
   int adsi;
   char username[80];
   char secret[80];
   char outkey[80];
   char timezone[80];
   char prefs[32];
   char context[AST_MAX_CONTEXT];
   char peercontext[AST_MAX_CONTEXT];
   char mohinterpret[MAX_MUSICCLASS];
   char mohsuggest[MAX_MUSICCLASS];
};

static int create_addr(const char *peername, struct ast_channel *c, struct sockaddr_in *sin, struct create_addr_info *cai)
{
   struct ast_hostent ahp;
   struct hostent *hp;
   struct iax2_peer *peer;
   int res = -1;
   struct ast_codec_pref ourprefs;

   ast_clear_flag(cai, IAX_SENDANI | IAX_TRUNK);
   cai->sockfd = defaultsockfd;
   cai->maxtime = 0;
   sin->sin_family = AF_INET;

   if (!(peer = find_peer(peername, 1))) {
      cai->found = 0;

      hp = ast_gethostbyname(peername, &ahp);
      if (hp) {
         memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
         sin->sin_port = htons(IAX_DEFAULT_PORTNO);
         /* use global iax prefs for unknown peer/user */
         /* But move the calling channel's native codec to the top of the preference list */
         memcpy(&ourprefs, &prefs, sizeof(ourprefs));
         if (c)
            ast_codec_pref_prepend(&ourprefs, c->nativeformats, 1);
         ast_codec_pref_convert(&ourprefs, cai->prefs, sizeof(cai->prefs), 1);
         return 0;
      } else {
         ast_log(LOG_WARNING, "No such host: %s\n", peername);
         return -1;
      }
   }

   cai->found = 1;
   
   /* if the peer has no address (current or default), return failure */
   if (!(peer->addr.sin_addr.s_addr || peer->defaddr.sin_addr.s_addr))
      goto return_unref;

   /* if the peer is being monitored and is currently unreachable, return failure */
   if (peer->maxms && ((peer->lastms > peer->maxms) || (peer->lastms < 0)))
      goto return_unref;

   ast_copy_flags(cai, peer, IAX_SENDANI | IAX_TRUNK | IAX_NOTRANSFER | IAX_TRANSFERMEDIA | IAX_USEJITTERBUF | IAX_FORCEJITTERBUF);
   cai->maxtime = peer->maxms;
   cai->capability = peer->capability;
   cai->encmethods = peer->encmethods;
   cai->sockfd = peer->sockfd;
   cai->adsi = peer->adsi;
   memcpy(&ourprefs, &peer->prefs, sizeof(ourprefs));
   /* Move the calling channel's native codec to the top of the preference list */
   if (c) {
      ast_log(LOG_DEBUG, "prepending %x to prefs\n", c->nativeformats);
      ast_codec_pref_prepend(&ourprefs, c->nativeformats, 1);
   }
   ast_codec_pref_convert(&ourprefs, cai->prefs, sizeof(cai->prefs), 1);
   ast_copy_string(cai->context, peer->context, sizeof(cai->context));
   ast_copy_string(cai->peercontext, peer->peercontext, sizeof(cai->peercontext));
   ast_copy_string(cai->username, peer->username, sizeof(cai->username));
   ast_copy_string(cai->timezone, peer->zonetag, sizeof(cai->timezone));
   ast_copy_string(cai->outkey, peer->outkey, sizeof(cai->outkey));
   ast_copy_string(cai->mohinterpret, peer->mohinterpret, sizeof(cai->mohinterpret));
   ast_copy_string(cai->mohsuggest, peer->mohsuggest, sizeof(cai->mohsuggest));
   if (ast_strlen_zero(peer->dbsecret)) {
      ast_copy_string(cai->secret, peer->secret, sizeof(cai->secret));
   } else {
      char *family;
      char *key = NULL;

      family = ast_strdupa(peer->dbsecret);
      key = strchr(family, '/');
      if (key)
         *key++ = '\0';
      if (!key || ast_db_get(family, key, cai->secret, sizeof(cai->secret))) {
         ast_log(LOG_WARNING, "Unable to retrieve database password for family/key '%s'!\n", peer->dbsecret);
         goto return_unref;
      }
   }

   if (peer->addr.sin_addr.s_addr) {
      sin->sin_addr = peer->addr.sin_addr;
      sin->sin_port = peer->addr.sin_port;
   } else {
      sin->sin_addr = peer->defaddr.sin_addr;
      sin->sin_port = peer->defaddr.sin_port;
   }

   res = 0;

return_unref:
   peer_unref(peer);

   return res;
}

static void __auto_congest(const void *nothing)
{
   int callno = PTR_TO_CALLNO(nothing);
   struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_CONGESTION };
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
      iaxs[callno]->initid = -1;
      iax2_queue_frame(callno, &f);
      ast_log(LOG_NOTICE, "Auto-congesting call due to slow response\n");
   }
   ast_mutex_unlock(&iaxsl[callno]);
}

static int auto_congest(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__auto_congest, data))
#endif      
      __auto_congest(data);
   return 0;
}

static unsigned int iax2_datetime(const char *tz)
{
   time_t t;
   struct tm tm;
   unsigned int tmp;
   time(&t);
   if (!ast_strlen_zero(tz))
      ast_localtime(&t, &tm, tz);
   else
      ast_localtime(&t, &tm, NULL);
   tmp  = (tm.tm_sec >> 1) & 0x1f;        /* 5 bits of seconds */
   tmp |= (tm.tm_min & 0x3f) << 5;        /* 6 bits of minutes */
   tmp |= (tm.tm_hour & 0x1f) << 11;      /* 5 bits of hours */
   tmp |= (tm.tm_mday & 0x1f) << 16;      /* 5 bits of day of month */
   tmp |= ((tm.tm_mon + 1) & 0xf) << 21;     /* 4 bits of month */
   tmp |= ((tm.tm_year - 100) & 0x7f) << 25; /* 7 bits of year */
   return tmp;
}

struct parsed_dial_string {
   char *username;
   char *password;
   char *key;
   char *peer;
   char *port;
   char *exten;
   char *context;
   char *options;
};

static int send_apathetic_reply(unsigned short callno, unsigned short dcallno, struct sockaddr_in *sin, int command, int ts, unsigned char seqno)
{
   struct ast_iax2_full_hdr f = { .scallno = htons(0x8000 | callno), .dcallno = htons(dcallno),
      .ts = htonl(ts), .iseqno = seqno, .oseqno = seqno, .type = AST_FRAME_IAX,
      .csub = compress_subclass(command) };

   return sendto(defaultsockfd, &f, sizeof(f), 0, (struct sockaddr *)sin, sizeof(*sin));
}

/*!
 * \brief Parses an IAX dial string into its component parts.
 * \param data the string to be parsed
 * \param pds pointer to a \c struct \c parsed_dial_string to be filled in
 * \return nothing
 *
 * This function parses the string and fills the structure
 * with pointers to its component parts. The input string
 * will be modified.
 *
 * \note This function supports both plaintext passwords and RSA
 * key names; if the password string is formatted as '[keyname]',
 * then the keyname will be placed into the key field, and the
 * password field will be set to NULL.
 *
 * \note The dial string format is:
 *       [username[:password]@]peer[:port][/exten[@@context]][/options]
 */
static void parse_dial_string(char *data, struct parsed_dial_string *pds)
{
   if (ast_strlen_zero(data))
      return;

   pds->peer = strsep(&data, "/");
   pds->exten = strsep(&data, "/");
   pds->options = data;

   if (pds->exten) {
      data = pds->exten;
      pds->exten = strsep(&data, "@");
      pds->context = data;
   }

   if (strchr(pds->peer, '@')) {
      data = pds->peer;
      pds->username = strsep(&data, "@");
      pds->peer = data;
   }

   if (pds->username) {
      data = pds->username;
      pds->username = strsep(&data, ":");
      pds->password = data;
   }

   data = pds->peer;
   pds->peer = strsep(&data, ":");
   pds->port = data;

   /* check for a key name wrapped in [] in the secret position, if found,
      move it to the key field instead
   */
   if (pds->password && (pds->password[0] == '[')) {
      pds->key = ast_strip_quoted(pds->password, "[", "]");
      pds->password = NULL;
   }
}

static int iax2_call(struct ast_channel *c, char *dest, int timeout)
{
   struct sockaddr_in sin;
   char *l=NULL, *n=NULL, *tmpstr;
   struct iax_ie_data ied;
   char *defaultrdest = "s";
   unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
   struct parsed_dial_string pds;
   struct create_addr_info cai;

   if ((c->_state != AST_STATE_DOWN) && (c->_state != AST_STATE_RESERVED)) {
      ast_log(LOG_WARNING, "Channel is already in use (%s)?\n", c->name);
      return -1;
   }

   memset(&cai, 0, sizeof(cai));
   cai.encmethods = iax2_encryption;

   memset(&pds, 0, sizeof(pds));
   tmpstr = ast_strdupa(dest);
   parse_dial_string(tmpstr, &pds);

   if (ast_strlen_zero(pds.peer)) {
      ast_log(LOG_WARNING, "No peer provided in the IAX2 dial string '%s'\n", dest);
      return -1;
   }

   if (!pds.exten) {
      pds.exten = defaultrdest;
   }

   if (create_addr(pds.peer, c, &sin, &cai)) {
      ast_log(LOG_WARNING, "No address associated with '%s'\n", pds.peer);
      return -1;
   }

   if (!pds.username && !ast_strlen_zero(cai.username))
      pds.username = cai.username;
   if (!pds.password && !ast_strlen_zero(cai.secret))
      pds.password = cai.secret;
   if (!pds.key && !ast_strlen_zero(cai.outkey))
      pds.key = cai.outkey;
   if (!pds.context && !ast_strlen_zero(cai.peercontext))
      pds.context = cai.peercontext;

   /* Keep track of the context for outgoing calls too */
   ast_copy_string(c->context, cai.context, sizeof(c->context));

   if (pds.port)
      sin.sin_port = htons(atoi(pds.port));

   l = c->cid.cid_num;
   n = c->cid.cid_name;

   /* Now build request */ 
   memset(&ied, 0, sizeof(ied));

   /* On new call, first IE MUST be IAX version of caller */
   iax_ie_append_short(&ied, IAX_IE_VERSION, IAX_PROTO_VERSION);
   iax_ie_append_str(&ied, IAX_IE_CALLED_NUMBER, pds.exten);
   if (pds.options && strchr(pds.options, 'a')) {
      /* Request auto answer */
      iax_ie_append(&ied, IAX_IE_AUTOANSWER);
   }

   iax_ie_append_str(&ied, IAX_IE_CODEC_PREFS, cai.prefs);

   if (l) {
      iax_ie_append_str(&ied, IAX_IE_CALLING_NUMBER, l);
      iax_ie_append_byte(&ied, IAX_IE_CALLINGPRES, c->cid.cid_pres);
   } else {
      if (n)
         iax_ie_append_byte(&ied, IAX_IE_CALLINGPRES, c->cid.cid_pres);
      else
         iax_ie_append_byte(&ied, IAX_IE_CALLINGPRES, AST_PRES_NUMBER_NOT_AVAILABLE);
   }

   iax_ie_append_byte(&ied, IAX_IE_CALLINGTON, c->cid.cid_ton);
   iax_ie_append_short(&ied, IAX_IE_CALLINGTNS, c->cid.cid_tns);

   if (n)
      iax_ie_append_str(&ied, IAX_IE_CALLING_NAME, n);
   if (ast_test_flag(iaxs[callno], IAX_SENDANI) && c->cid.cid_ani)
      iax_ie_append_str(&ied, IAX_IE_CALLING_ANI, c->cid.cid_ani);

   if (!ast_strlen_zero(c->language))
      iax_ie_append_str(&ied, IAX_IE_LANGUAGE, c->language);
   if (!ast_strlen_zero(c->cid.cid_dnid))
      iax_ie_append_str(&ied, IAX_IE_DNID, c->cid.cid_dnid);
   if (!ast_strlen_zero(c->cid.cid_rdnis))
      iax_ie_append_str(&ied, IAX_IE_RDNIS, c->cid.cid_rdnis);

   if (pds.context)
      iax_ie_append_str(&ied, IAX_IE_CALLED_CONTEXT, pds.context);

   if (pds.username)
      iax_ie_append_str(&ied, IAX_IE_USERNAME, pds.username);

   if (cai.encmethods)
      iax_ie_append_short(&ied, IAX_IE_ENCRYPTION, cai.encmethods);

   ast_mutex_lock(&iaxsl[callno]);

   if (!ast_strlen_zero(c->context))
      ast_string_field_set(iaxs[callno], context, c->context);

   if (pds.username)
      ast_string_field_set(iaxs[callno], username, pds.username);

   iaxs[callno]->encmethods = cai.encmethods;

   iaxs[callno]->adsi = cai.adsi;
   
   ast_string_field_set(iaxs[callno], mohinterpret, cai.mohinterpret);
   ast_string_field_set(iaxs[callno], mohsuggest, cai.mohsuggest);

   if (pds.key)
      ast_string_field_set(iaxs[callno], outkey, pds.key);
   if (pds.password)
      ast_string_field_set(iaxs[callno], secret, pds.password);

   iax_ie_append_int(&ied, IAX_IE_FORMAT, c->nativeformats);
   iax_ie_append_int(&ied, IAX_IE_CAPABILITY, iaxs[callno]->capability);
   iax_ie_append_short(&ied, IAX_IE_ADSICPE, c->adsicpe);
   iax_ie_append_int(&ied, IAX_IE_DATETIME, iax2_datetime(cai.timezone));

   if (iaxs[callno]->maxtime) {
      /* Initialize pingtime and auto-congest time */
      iaxs[callno]->pingtime = iaxs[callno]->maxtime / 2;
      iaxs[callno]->initid = iax2_sched_add(sched, iaxs[callno]->maxtime * 2, auto_congest, CALLNO_TO_PTR(callno));
   } else if (autokill) {
      iaxs[callno]->pingtime = autokill / 2;
      iaxs[callno]->initid = iax2_sched_add(sched, autokill * 2, auto_congest, CALLNO_TO_PTR(callno));
   }

   /* send the command using the appropriate socket for this peer */
   iaxs[callno]->sockfd = cai.sockfd;

   /* Transmit the string in a "NEW" request */
   send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_NEW, 0, ied.buf, ied.pos, -1);

   ast_mutex_unlock(&iaxsl[callno]);
   ast_setstate(c, AST_STATE_RINGING);
   
   return 0;
}

static int iax2_hangup(struct ast_channel *c) 
{
   unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
   int alreadygone;
   struct iax_ie_data ied;
   memset(&ied, 0, sizeof(ied));
   ast_mutex_lock(&iaxsl[callno]);
   if (callno && iaxs[callno]) {
      if (option_debug)
         ast_log(LOG_DEBUG, "We're hanging up %s with cause %i now...\n", c->name, c->hangupcause);
      alreadygone = ast_test_flag(iaxs[callno], IAX_ALREADYGONE);
      /* Send the hangup unless we have had a transmission error or are already gone */
      iax_ie_append_byte(&ied, IAX_IE_CAUSECODE, (unsigned char)c->hangupcause);
      if (!iaxs[callno]->error && !alreadygone) {
         send_command_final(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_HANGUP, 0, ied.buf, ied.pos, -1);
         if (!iaxs[callno]) {
            ast_mutex_unlock(&iaxsl[callno]);
            return 0;
         }
      }
      /* Explicitly predestroy it */
      iax2_predestroy(callno);
      /* If we were already gone to begin with, destroy us now */
      if (alreadygone && iaxs[callno]) {
         if (option_debug)
            ast_log(LOG_DEBUG, "Really destroying %s now...\n", c->name);
         iax2_destroy(callno);
      }
   }
   ast_mutex_unlock(&iaxsl[callno]);
   if (option_verbose > 2) 
      ast_verbose(VERBOSE_PREFIX_3 "Hungup '%s'\n", c->name);
   return 0;
}

static int iax2_setoption(struct ast_channel *c, int option, void *data, int datalen)
{
   struct ast_option_header *h;
   int res;

   switch (option) {
   case AST_OPTION_TXGAIN:
   case AST_OPTION_RXGAIN:
      /* these two cannot be sent, because they require a result */
      errno = ENOSYS;
      return -1;
   default:
      if (!(h = ast_malloc(datalen + sizeof(*h))))
         return -1;

      h->flag = AST_OPTION_FLAG_REQUEST;
      h->option = htons(option);
      memcpy(h->data, data, datalen);
      res = send_command_locked(PTR_TO_CALLNO(c->tech_pvt), AST_FRAME_CONTROL,
                 AST_CONTROL_OPTION, 0, (unsigned char *) h,
                 datalen + sizeof(*h), -1);
      free(h);
      return res;
   }
}

static struct ast_frame *iax2_read(struct ast_channel *c) 
{
   if (option_verbose > 3)
       ast_log(LOG_NOTICE, "I should never be called!\n");
   return &ast_null_frame;
}

static int iax2_start_transfer(unsigned short callno0, unsigned short callno1, int mediaonly)
{
   int res;
   struct iax_ie_data ied0;
   struct iax_ie_data ied1;
   unsigned int transferid = (unsigned int)ast_random();
   memset(&ied0, 0, sizeof(ied0));
   iax_ie_append_addr(&ied0, IAX_IE_APPARENT_ADDR, &iaxs[callno1]->addr);
   iax_ie_append_short(&ied0, IAX_IE_CALLNO, iaxs[callno1]->peercallno);
   iax_ie_append_int(&ied0, IAX_IE_TRANSFERID, transferid);

   memset(&ied1, 0, sizeof(ied1));
   iax_ie_append_addr(&ied1, IAX_IE_APPARENT_ADDR, &iaxs[callno0]->addr);
   iax_ie_append_short(&ied1, IAX_IE_CALLNO, iaxs[callno0]->peercallno);
   iax_ie_append_int(&ied1, IAX_IE_TRANSFERID, transferid);
   
   res = send_command(iaxs[callno0], AST_FRAME_IAX, IAX_COMMAND_TXREQ, 0, ied0.buf, ied0.pos, -1);
   if (res)
      return -1;
   res = send_command(iaxs[callno1], AST_FRAME_IAX, IAX_COMMAND_TXREQ, 0, ied1.buf, ied1.pos, -1);
   if (res)
      return -1;
   iaxs[callno0]->transferring = mediaonly ? TRANSFER_MBEGIN : TRANSFER_BEGIN;
   iaxs[callno1]->transferring = mediaonly ? TRANSFER_MBEGIN : TRANSFER_BEGIN;
   return 0;
}

static void lock_both(unsigned short callno0, unsigned short callno1)
{
   ast_mutex_lock(&iaxsl[callno0]);
   while (ast_mutex_trylock(&iaxsl[callno1])) {
      DEADLOCK_AVOIDANCE(&iaxsl[callno0]);
   }
}

static void unlock_both(unsigned short callno0, unsigned short callno1)
{
   ast_mutex_unlock(&iaxsl[callno1]);
   ast_mutex_unlock(&iaxsl[callno0]);
}

static enum ast_bridge_result iax2_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc, int timeoutms)
{
   struct ast_channel *cs[3];
   struct ast_channel *who, *other;
   int to = -1;
   int res = -1;
   int transferstarted=0;
   struct ast_frame *f;
   unsigned short callno0 = PTR_TO_CALLNO(c0->tech_pvt);
   unsigned short callno1 = PTR_TO_CALLNO(c1->tech_pvt);
   struct timeval waittimer = {0, 0}, tv;

   lock_both(callno0, callno1);
   if (!iaxs[callno0] || !iaxs[callno1]) {
      unlock_both(callno0, callno1);
      return AST_BRIDGE_FAILED;
   }
   /* Put them in native bridge mode */
   if (!flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1)) {
      iaxs[callno0]->bridgecallno = callno1;
      iaxs[callno1]->bridgecallno = callno0;
   }
   unlock_both(callno0, callno1);

   /* If not, try to bridge until we can execute a transfer, if we can */
   cs[0] = c0;
   cs[1] = c1;
   for (/* ever */;;) {
      /* Check in case we got masqueraded into */
      if ((c0->tech != &iax2_tech) || (c1->tech != &iax2_tech)) {
         if (option_verbose > 2)
            ast_verbose(VERBOSE_PREFIX_3 "Can't masquerade, we're different...\n");
         /* Remove from native mode */
         if (c0->tech == &iax2_tech) {
            ast_mutex_lock(&iaxsl[callno0]);
            iaxs[callno0]->bridgecallno = 0;
            ast_mutex_unlock(&iaxsl[callno0]);
         }
         if (c1->tech == &iax2_tech) {
            ast_mutex_lock(&iaxsl[callno1]);
            iaxs[callno1]->bridgecallno = 0;
            ast_mutex_unlock(&iaxsl[callno1]);
         }
         return AST_BRIDGE_FAILED_NOWARN;
      }
      if (c0->nativeformats != c1->nativeformats) {
         if (option_verbose > 2) {
            char buf0[255];
            char buf1[255];
            ast_getformatname_multiple(buf0, sizeof(buf0) -1, c0->nativeformats);
            ast_getformatname_multiple(buf1, sizeof(buf1) -1, c1->nativeformats);
            ast_verbose(VERBOSE_PREFIX_3 "Operating with different codecs %d[%s] %d[%s] , can't native bridge...\n", c0->nativeformats, buf0, c1->nativeformats, buf1);
         }
         /* Remove from native mode */
         lock_both(callno0, callno1);
         if (iaxs[callno0])
            iaxs[callno0]->bridgecallno = 0;
         if (iaxs[callno1])
            iaxs[callno1]->bridgecallno = 0;
         unlock_both(callno0, callno1);
         return AST_BRIDGE_FAILED_NOWARN;
      }
      /* check if transfered and if we really want native bridging */
      if (!transferstarted && !ast_test_flag(iaxs[callno0], IAX_NOTRANSFER) && !ast_test_flag(iaxs[callno1], IAX_NOTRANSFER)) {
         /* Try the transfer */
         if (iax2_start_transfer(callno0, callno1, (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1)) ||
                     ast_test_flag(iaxs[callno0], IAX_TRANSFERMEDIA) | ast_test_flag(iaxs[callno1], IAX_TRANSFERMEDIA)))
            ast_log(LOG_WARNING, "Unable to start the transfer\n");
         transferstarted = 1;
      }
      if ((iaxs[callno0]->transferring == TRANSFER_RELEASED) && (iaxs[callno1]->transferring == TRANSFER_RELEASED)) {
         /* Call has been transferred.  We're no longer involved */
         gettimeofday(&tv, NULL);
         if (ast_tvzero(waittimer)) {
            waittimer = tv;
         } else if (tv.tv_sec - waittimer.tv_sec > IAX_LINGER_TIMEOUT) {
            c0->_softhangup |= AST_SOFTHANGUP_DEV;
            c1->_softhangup |= AST_SOFTHANGUP_DEV;
            *fo = NULL;
            *rc = c0;
            res = AST_BRIDGE_COMPLETE;
            break;
         }
      }
      to = 1000;
      who = ast_waitfor_n(cs, 2, &to);
      if (timeoutms > -1) {
         timeoutms -= (1000 - to);
         if (timeoutms < 0)
            timeoutms = 0;
      }
      if (!who) {
         if (!timeoutms) {
            res = AST_BRIDGE_RETRY;
            break;
         }
         if (ast_check_hangup(c0) || ast_check_hangup(c1)) {
            res = AST_BRIDGE_FAILED;
            break;
         }
         continue;
      }
      f = ast_read(who);
      if (!f) {
         *fo = NULL;
         *rc = who;
         res = AST_BRIDGE_COMPLETE;
         break;
      }
      if ((f->frametype == AST_FRAME_CONTROL) && !(flags & AST_BRIDGE_IGNORE_SIGS)) {
         *fo = f;
         *rc = who;
         res =  AST_BRIDGE_COMPLETE;
         break;
      }
      other = (who == c0) ? c1 : c0;  /* the 'other' channel */
      if ((f->frametype == AST_FRAME_VOICE) ||
          (f->frametype == AST_FRAME_TEXT) ||
          (f->frametype == AST_FRAME_VIDEO) || 
          (f->frametype == AST_FRAME_IMAGE) ||
          (f->frametype == AST_FRAME_DTMF)) {
         /* monitored dtmf take out of the bridge.
          * check if we monitor the specific source.
          */
         int monitored_source = (who == c0) ? AST_BRIDGE_DTMF_CHANNEL_0 : AST_BRIDGE_DTMF_CHANNEL_1;
         if (f->frametype == AST_FRAME_DTMF && (flags & monitored_source)) {
            *rc = who;
            *fo = f;
            res = AST_BRIDGE_COMPLETE;
            /* Remove from native mode */
            break;
         }
         /* everything else goes to the other side */
         ast_write(other, f);
      }
      ast_frfree(f);
      /* Swap who gets priority */
      cs[2] = cs[0];
      cs[0] = cs[1];
      cs[1] = cs[2];
   }
   lock_both(callno0, callno1);
   if(iaxs[callno0])
      iaxs[callno0]->bridgecallno = 0;
   if(iaxs[callno1])
      iaxs[callno1]->bridgecallno = 0;
   unlock_both(callno0, callno1);
   return res;
}

static int iax2_answer(struct ast_channel *c)
{
   unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
   if (option_debug)
      ast_log(LOG_DEBUG, "Answering IAX2 call\n");
   return send_command_locked(callno, AST_FRAME_CONTROL, AST_CONTROL_ANSWER, 0, NULL, 0, -1);
}

static int iax2_indicate(struct ast_channel *c, int condition, const void *data, size_t datalen)
{
   unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
   struct chan_iax2_pvt *pvt;
   int res = 0;

   if (option_debug && iaxdebug)
      ast_log(LOG_DEBUG, "Indicating condition %d\n", condition);

   ast_mutex_lock(&iaxsl[callno]);
   pvt = iaxs[callno];

   if (!pvt->peercallno) {
      /* We don't know the remote side's call number, yet.  :( */
      int count = 10;
      while (count-- && pvt && !pvt->peercallno) {
         DEADLOCK_AVOIDANCE(&iaxsl[callno]);
         pvt = iaxs[callno];
      }
      if (!pvt->peercallno) {
         res = -1;
         goto done;
      }
   }

   switch (condition) {
   case AST_CONTROL_HOLD:
      if (strcasecmp(pvt->mohinterpret, "passthrough")) {
         ast_moh_start(c, data, pvt->mohinterpret);
         goto done;
      }
      break;
   case AST_CONTROL_UNHOLD:
      if (strcasecmp(pvt->mohinterpret, "passthrough")) {
         ast_moh_stop(c);
         goto done;
      }
   }

   res = send_command(pvt, AST_FRAME_CONTROL, condition, 0, data, datalen, -1);

done:
   ast_mutex_unlock(&iaxsl[callno]);

   return res;
}
   
static int iax2_transfer(struct ast_channel *c, const char *dest)
{
   unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
   struct iax_ie_data ied;
   char tmp[256], *context;
   ast_copy_string(tmp, dest, sizeof(tmp));
   context = strchr(tmp, '@');
   if (context) {
      *context = '\0';
      context++;
   }
   memset(&ied, 0, sizeof(ied));
   iax_ie_append_str(&ied, IAX_IE_CALLED_NUMBER, tmp);
   if (context)
      iax_ie_append_str(&ied, IAX_IE_CALLED_CONTEXT, context);
   if (option_debug)
      ast_log(LOG_DEBUG, "Transferring '%s' to '%s'\n", c->name, dest);
   return send_command_locked(callno, AST_FRAME_IAX, IAX_COMMAND_TRANSFER, 0, ied.buf, ied.pos, -1);
}
   
static int iax2_getpeertrunk(struct sockaddr_in sin)
{
   struct iax2_peer *peer;
   int res = 0;
   struct ao2_iterator i;

   i = ao2_iterator_init(peers, 0);
   while ((peer = ao2_iterator_next(&i))) {
      if ((peer->addr.sin_addr.s_addr == sin.sin_addr.s_addr) &&
          (peer->addr.sin_port == sin.sin_port)) {
         res = ast_test_flag(peer, IAX_TRUNK);
         peer_unref(peer);
         break;
      }
      peer_unref(peer);
   }

   return res;
}

/*! \brief  Create new call, interface with the PBX core */
static struct ast_channel *ast_iax2_new(int callno, int state, int capability)
{
   struct ast_channel *tmp;
   struct chan_iax2_pvt *i;
   struct ast_variable *v = NULL;

   if (!(i = iaxs[callno])) {
      ast_log(LOG_WARNING, "No IAX2 pvt found for callno '%d' !\n", callno);
      return NULL;
   }

   /* Don't hold call lock */
   ast_mutex_unlock(&iaxsl[callno]);
   tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, i->accountcode, i->exten, i->context, i->amaflags, "IAX2/%s-%d", i->host, i->callno);
   ast_mutex_lock(&iaxsl[callno]);
   if (!iaxs[callno]) {
      if (tmp) {
         ast_channel_free(tmp);
      }
      ast_mutex_unlock(&iaxsl[callno]);
      return NULL;
   }

   if (!tmp)
      return NULL;
   tmp->tech = &iax2_tech;
   /* We can support any format by default, until we get restricted */
   tmp->nativeformats = capability;
   tmp->readformat = ast_best_codec(capability);
   tmp->writeformat = ast_best_codec(capability);
   tmp->tech_pvt = CALLNO_TO_PTR(i->callno);

   /* Don't use ast_set_callerid() here because it will
    * generate a NewCallerID event before the NewChannel event */
   if (!ast_strlen_zero(i->ani))
      tmp->cid.cid_ani = ast_strdup(i->ani);
   else
      tmp->cid.cid_ani = ast_strdup(i->cid_num);
   tmp->cid.cid_dnid = ast_strdup(i->dnid);
   tmp->cid.cid_rdnis = ast_strdup(i->rdnis);
   tmp->cid.cid_pres = i->calling_pres;
   tmp->cid.cid_ton = i->calling_ton;
   tmp->cid.cid_tns = i->calling_tns;
   if (!ast_strlen_zero(i->language))
      ast_string_field_set(tmp, language, i->language);
   if (!ast_strlen_zero(i->accountcode))
      ast_string_field_set(tmp, accountcode, i->accountcode);
   if (i->amaflags)
      tmp->amaflags = i->amaflags;
   ast_copy_string(tmp->context, i->context, sizeof(tmp->context));
   ast_copy_string(tmp->exten, i->exten, sizeof(tmp->exten));
   if (i->adsi)
      tmp->adsicpe = i->peeradsicpe;
   else
      tmp->adsicpe = AST_ADSI_UNAVAILABLE;
   i->owner = tmp;
   i->capability = capability;

   for (v = i->vars ; v ; v = v->next)
      pbx_builtin_setvar_helper(tmp, v->name, v->value);

   if (state != AST_STATE_DOWN) {
      if (ast_pbx_start(tmp)) {
         ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
         ast_hangup(tmp);
         i->owner = NULL;
         return NULL;
      }
   }

   ast_module_ref(ast_module_info->self);
   
   return tmp;
}

static unsigned int calc_txpeerstamp(struct iax2_trunk_peer *tpeer, int sampms, struct timeval *tv)
{
   unsigned long int mssincetx; /* unsigned to handle overflows */
   long int ms, pred;

   tpeer->trunkact = *tv;
   mssincetx = ast_tvdiff_ms(*tv, tpeer->lasttxtime);
   if (mssincetx > 5000 || ast_tvzero(tpeer->txtrunktime)) {
      /* If it's been at least 5 seconds since the last time we transmitted on this trunk, reset our timers */
      tpeer->txtrunktime = *tv;
      tpeer->lastsent = 999999;
   }
   /* Update last transmit time now */
   tpeer->lasttxtime = *tv;
   
   /* Calculate ms offset */
   ms = ast_tvdiff_ms(*tv, tpeer->txtrunktime);
   /* Predict from last value */
   pred = tpeer->lastsent + sampms;
   if (abs(ms - pred) < MAX_TIMESTAMP_SKEW)
      ms = pred;
   
   /* We never send the same timestamp twice, so fudge a little if we must */
   if (ms == tpeer->lastsent)
      ms = tpeer->lastsent + 1;
   tpeer->lastsent = ms;
   return ms;
}

static unsigned int fix_peerts(struct timeval *tv, int callno, unsigned int ts)
{
   long ms; /* NOT unsigned */
   if (ast_tvzero(iaxs[callno]->rxcore)) {
      /* Initialize rxcore time if appropriate */
      gettimeofday(&iaxs[callno]->rxcore, NULL);
      /* Round to nearest 20ms so traces look pretty */
      iaxs[callno]->rxcore.tv_usec -= iaxs[callno]->rxcore.tv_usec % 20000;
   }
   /* Calculate difference between trunk and channel */
   ms = ast_tvdiff_ms(*tv, iaxs[callno]->rxcore);
   /* Return as the sum of trunk time and the difference between trunk and real time */
   return ms + ts;
}

static unsigned int calc_timestamp(struct chan_iax2_pvt *p, unsigned int ts, struct ast_frame *f)
{
   int ms;
   int voice = 0;
   int genuine = 0;
   int adjust;
   struct timeval *delivery = NULL;


   /* What sort of frame do we have?: voice is self-explanatory
      "genuine" means an IAX frame - things like LAGRQ/RP, PING/PONG, ACK
      non-genuine frames are CONTROL frames [ringing etc], DTMF
      The "genuine" distinction is needed because genuine frames must get a clock-based timestamp,
      the others need a timestamp slaved to the voice frames so that they go in sequence
   */
   if (f) {
      if (f->frametype == AST_FRAME_VOICE) {
         voice = 1;
         delivery = &f->delivery;
      } else if (f->frametype == AST_FRAME_IAX) {
         genuine = 1;
      } else if (f->frametype == AST_FRAME_CNG) {
         p->notsilenttx = 0;  
      }
   }
   if (ast_tvzero(p->offset)) {
      gettimeofday(&p->offset, NULL);
      /* Round to nearest 20ms for nice looking traces */
      p->offset.tv_usec -= p->offset.tv_usec % 20000;
   }
   /* If the timestamp is specified, just send it as is */
   if (ts)
      return ts;
   /* If we have a time that the frame arrived, always use it to make our timestamp */
   if (delivery && !ast_tvzero(*delivery)) {
      ms = ast_tvdiff_ms(*delivery, p->offset);
      if (option_debug > 2 && iaxdebug)
         ast_log(LOG_DEBUG, "calc_timestamp: call %d/%d: Timestamp slaved to delivery time\n", p->callno, iaxs[p->callno]->peercallno);
   } else {
      ms = ast_tvdiff_ms(ast_tvnow(), p->offset);
      if (ms < 0)
         ms = 0;
      if (voice) {
         /* On a voice frame, use predicted values if appropriate */
         if (p->notsilenttx && abs(ms - p->nextpred) <= MAX_TIMESTAMP_SKEW) {
            /* Adjust our txcore, keeping voice and non-voice synchronized */
            /* AN EXPLANATION:
               When we send voice, we usually send "calculated" timestamps worked out
               on the basis of the number of samples sent. When we send other frames,
               we usually send timestamps worked out from the real clock.
               The problem is that they can tend to drift out of step because the 
                  source channel's clock and our clock may not be exactly at the same rate.
               We fix this by continuously "tweaking" p->offset.  p->offset is "time zero"
               for this call.  Moving it adjusts timestamps for non-voice frames.
               We make the adjustment in the style of a moving average.  Each time we
               adjust p->offset by 10% of the difference between our clock-derived
               timestamp and the predicted timestamp.  That's why you see "10000"
               below even though IAX2 timestamps are in milliseconds.
               The use of a moving average avoids offset moving too radically.
               Generally, "adjust" roams back and forth around 0, with offset hardly
               changing at all.  But if a consistent different starts to develop it
               will be eliminated over the course of 10 frames (200-300msecs) 
            */
            adjust = (ms - p->nextpred);
            if (adjust < 0)
               p->offset = ast_tvsub(p->offset, ast_samp2tv(abs(adjust), 10000));
            else if (adjust > 0)
               p->offset = ast_tvadd(p->offset, ast_samp2tv(adjust, 10000));

            if (!p->nextpred) {
               p->nextpred = ms; /*f->samples / 8;*/
               if (p->nextpred <= p->lastsent)
                  p->nextpred = p->lastsent + 3;
            }
            ms = p->nextpred;
         } else {
                /* in this case, just use the actual
            * time, since we're either way off
            * (shouldn't happen), or we're  ending a
            * silent period -- and seed the next
            * predicted time.  Also, round ms to the
            * next multiple of frame size (so our
            * silent periods are multiples of
            * frame size too) */

            if (option_debug && iaxdebug && abs(ms - p->nextpred) > MAX_TIMESTAMP_SKEW )
               ast_log(LOG_DEBUG, "predicted timestamp skew (%u) > max (%u), using real ts instead.\n",
                  abs(ms - p->nextpred), MAX_TIMESTAMP_SKEW);

            if (f->samples >= 8) /* check to make sure we dont core dump */
            {
               int diff = ms % (f->samples / 8);
               if (diff)
                   ms += f->samples/8 - diff;
            }

            p->nextpred = ms;
            p->notsilenttx = 1;
         }
      } else if ( f->frametype == AST_FRAME_VIDEO ) {
         /*
         * IAX2 draft 03 says that timestamps MUST be in order.
         * It does not say anything about several frames having the same timestamp
         * When transporting video, we can have a frame that spans multiple iax packets
         * (so called slices), so it would make sense to use the same timestamp for all of
         * them
         * We do want to make sure that frames don't go backwards though
         */
         if ( (unsigned int)ms < p->lastsent )
            ms = p->lastsent;
      } else {
         /* On a dataframe, use last value + 3 (to accomodate jitter buffer shrinking) if appropriate unless
            it's a genuine frame */
         if (genuine) {
            /* genuine (IAX LAGRQ etc) must keep their clock-based stamps */
            if (ms <= p->lastsent)
               ms = p->lastsent + 3;
         } else if (abs(ms - p->lastsent) <= MAX_TIMESTAMP_SKEW) {
            /* non-genuine frames (!?) (DTMF, CONTROL) should be pulled into the predicted stream stamps */
            ms = p->lastsent + 3;
         }
      }
   }
   p->lastsent = ms;
   if (voice)
      p->nextpred = p->nextpred + f->samples / 8;
   return ms;
}

static unsigned int calc_rxstamp(struct chan_iax2_pvt *p, unsigned int offset)
{
   /* Returns where in "receive time" we are.  That is, how many ms
      since we received (or would have received) the frame with timestamp 0 */
   int ms;
#ifdef IAXTESTS
   int jit;
#endif /* IAXTESTS */
   /* Setup rxcore if necessary */
   if (ast_tvzero(p->rxcore)) {
      p->rxcore = ast_tvnow();
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "calc_rxstamp: call=%d: rxcore set to %d.%6.6d - %dms\n",
               p->callno, (int)(p->rxcore.tv_sec), (int)(p->rxcore.tv_usec), offset);
      p->rxcore = ast_tvsub(p->rxcore, ast_samp2tv(offset, 1000));
#if 1
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "calc_rxstamp: call=%d: works out as %d.%6.6d\n",
               p->callno, (int)(p->rxcore.tv_sec),(int)( p->rxcore.tv_usec));
#endif
   }

   ms = ast_tvdiff_ms(ast_tvnow(), p->rxcore);
#ifdef IAXTESTS
   if (test_jit) {
      if (!test_jitpct || ((100.0 * ast_random() / (RAND_MAX + 1.0)) < test_jitpct)) {
         jit = (int)((float)test_jit * ast_random() / (RAND_MAX + 1.0));
         if ((int)(2.0 * ast_random() / (RAND_MAX + 1.0)))
            jit = -jit;
         ms += jit;
      }
   }
   if (test_late) {
      ms += test_late;
      test_late = 0;
   }
#endif /* IAXTESTS */
   return ms;
}

static struct iax2_trunk_peer *find_tpeer(struct sockaddr_in *sin, int fd)
{
   struct iax2_trunk_peer *tpeer;
   
   /* Finds and locks trunk peer */
   ast_mutex_lock(&tpeerlock);
   for (tpeer = tpeers; tpeer; tpeer = tpeer->next) {
      /* We don't lock here because tpeer->addr *never* changes */
      if (!inaddrcmp(&tpeer->addr, sin)) {
         ast_mutex_lock(&tpeer->lock);
         break;
      }
   }
   if (!tpeer) {
      if ((tpeer = ast_calloc(1, sizeof(*tpeer)))) {
         ast_mutex_init(&tpeer->lock);
         tpeer->lastsent = 9999;
         memcpy(&tpeer->addr, sin, sizeof(tpeer->addr));
         tpeer->trunkact = ast_tvnow();
         ast_mutex_lock(&tpeer->lock);
         tpeer->next = tpeers;
         tpeer->sockfd = fd;
         tpeers = tpeer;
#ifdef SO_NO_CHECK
         setsockopt(tpeer->sockfd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
#endif
         if (option_debug)
            ast_log(LOG_DEBUG, "Created trunk peer for '%s:%d'\n", ast_inet_ntoa(tpeer->addr.sin_addr), ntohs(tpeer->addr.sin_port));
      }
   }
   ast_mutex_unlock(&tpeerlock);
   return tpeer;
}

static int iax2_trunk_queue(struct chan_iax2_pvt *pvt, struct iax_frame *fr)
{
   struct ast_frame *f;
   struct iax2_trunk_peer *tpeer;
   void *tmp, *ptr;
   struct ast_iax2_meta_trunk_entry *met;
   struct ast_iax2_meta_trunk_mini *mtm;

   f = &fr->af;
   tpeer = find_tpeer(&pvt->addr, pvt->sockfd);
   if (tpeer) {
      if (tpeer->trunkdatalen + f->datalen + 4 >= tpeer->trunkdataalloc) {
         /* Need to reallocate space */
         if (tpeer->trunkdataalloc < MAX_TRUNKDATA) {
            if (!(tmp = ast_realloc(tpeer->trunkdata, tpeer->trunkdataalloc + DEFAULT_TRUNKDATA + IAX2_TRUNK_PREFACE))) {
               ast_mutex_unlock(&tpeer->lock);
               return -1;
            }
            
            tpeer->trunkdataalloc += DEFAULT_TRUNKDATA;
            tpeer->trunkdata = tmp;
            if (option_debug)
               ast_log(LOG_DEBUG, "Expanded trunk '%s:%d' to %d bytes\n", ast_inet_ntoa(tpeer->addr.sin_addr), ntohs(tpeer->addr.sin_port), tpeer->trunkdataalloc);
         } else {
            ast_log(LOG_WARNING, "Maximum trunk data space exceeded to %s:%d\n", ast_inet_ntoa(tpeer->addr.sin_addr), ntohs(tpeer->addr.sin_port));
            ast_mutex_unlock(&tpeer->lock);
            return -1;
         }
      }

      /* Append to meta frame */
      ptr = tpeer->trunkdata + IAX2_TRUNK_PREFACE + tpeer->trunkdatalen;
      if (ast_test_flag(&globalflags, IAX_TRUNKTIMESTAMPS)) {
         mtm = (struct ast_iax2_meta_trunk_mini *)ptr;
         mtm->len = htons(f->datalen);
         mtm->mini.callno = htons(pvt->callno);
         mtm->mini.ts = htons(0xffff & fr->ts);
         ptr += sizeof(struct ast_iax2_meta_trunk_mini);
         tpeer->trunkdatalen += sizeof(struct ast_iax2_meta_trunk_mini);
      } else {
         met = (struct ast_iax2_meta_trunk_entry *)ptr;
         /* Store call number and length in meta header */
         met->callno = htons(pvt->callno);
         met->len = htons(f->datalen);
         /* Advance pointers/decrease length past trunk entry header */
         ptr += sizeof(struct ast_iax2_meta_trunk_entry);
         tpeer->trunkdatalen += sizeof(struct ast_iax2_meta_trunk_entry);
      }
      /* Copy actual trunk data */
      memcpy(ptr, f->data, f->datalen);
      tpeer->trunkdatalen += f->datalen;

      tpeer->calls++;
      ast_mutex_unlock(&tpeer->lock);
   }
   return 0;
}

static void build_encryption_keys(const unsigned char *digest, struct chan_iax2_pvt *pvt)
{
   build_ecx_key(digest, pvt);
   aes_decrypt_key128(digest, &pvt->dcx);
}
  
static void build_ecx_key(const unsigned char *digest, struct chan_iax2_pvt *pvt)
{
   /* it is required to hold the corresponding decrypt key to our encrypt key
    * in the pvt struct because queued frames occasionally need to be decrypted and
    * re-encrypted when updated for a retransmission */
   aes_encrypt_key128(digest, &pvt->ecx);
   aes_decrypt_key128(digest, &pvt->mydcx);
}

static void memcpy_decrypt(unsigned char *dst, const unsigned char *src, int len, aes_decrypt_ctx *dcx)
{
#if 0
   /* Debug with "fake encryption" */
   int x;
   if (len % 16)
      ast_log(LOG_WARNING, "len should be multiple of 16, not %d!\n", len);
   for (x=0;x<len;x++)
      dst[x] = src[x] ^ 0xff;
#else 
   unsigned char lastblock[16] = { 0 };
   int x;
   while(len > 0) {
      aes_decrypt(src, dst, dcx);
      for (x=0;x<16;x++)
         dst[x] ^= lastblock[x];
      memcpy(lastblock, src, sizeof(lastblock));
      dst += 16;
      src += 16;
      len -= 16;
   }
#endif
}

static void memcpy_encrypt(unsigned char *dst, const unsigned char *src, int len, aes_encrypt_ctx *ecx)
{
#if 0
   /* Debug with "fake encryption" */
   int x;
   if (len % 16)
      ast_log(LOG_WARNING, "len should be multiple of 16, not %d!\n", len);
   for (x=0;x<len;x++)
      dst[x] = src[x] ^ 0xff;
#else
   unsigned char curblock[16] = { 0 };
   int x;
   while(len > 0) {
      for (x=0;x<16;x++)
         curblock[x] ^= src[x];
      aes_encrypt(curblock, dst, ecx);
      memcpy(curblock, dst, sizeof(curblock)); 
      dst += 16;
      src += 16;
      len -= 16;
   }
#endif
}

static int decode_frame(aes_decrypt_ctx *dcx, struct ast_iax2_full_hdr *fh, struct ast_frame *f, int *datalen)
{
   int padding;
   unsigned char *workspace;

   workspace = alloca(*datalen);
   memset(f, 0, sizeof(*f));
   if (ntohs(fh->scallno) & IAX_FLAG_FULL) {
      struct ast_iax2_full_enc_hdr *efh = (struct ast_iax2_full_enc_hdr *)fh;
      if (*datalen < 16 + sizeof(struct ast_iax2_full_hdr))
         return -1;
      /* Decrypt */
      memcpy_decrypt(workspace, efh->encdata, *datalen - sizeof(struct ast_iax2_full_enc_hdr), dcx);

      padding = 16 + (workspace[15] & 0xf);
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Decoding full frame with length %d (padding = %d) (15=%02x)\n", *datalen, padding, workspace[15]);
      if (*datalen < padding + sizeof(struct ast_iax2_full_hdr))
         return -1;

      *datalen -= padding;
      memcpy(efh->encdata, workspace + padding, *datalen - sizeof(struct ast_iax2_full_enc_hdr));
      f->frametype = fh->type;
      if (f->frametype == AST_FRAME_VIDEO) {
         f->subclass = uncompress_subclass(fh->csub & ~0x40) | ((fh->csub >> 6) & 0x1);
      } else {
         f->subclass = uncompress_subclass(fh->csub);
      }
   } else {
      struct ast_iax2_mini_enc_hdr *efh = (struct ast_iax2_mini_enc_hdr *)fh;
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Decoding mini with length %d\n", *datalen);
      if (*datalen < 16 + sizeof(struct ast_iax2_mini_hdr))
         return -1;
      /* Decrypt */
      memcpy_decrypt(workspace, efh->encdata, *datalen - sizeof(struct ast_iax2_mini_enc_hdr), dcx);
      padding = 16 + (workspace[15] & 0x0f);
      if (*datalen < padding + sizeof(struct ast_iax2_mini_hdr))
         return -1;
      *datalen -= padding;
      memcpy(efh->encdata, workspace + padding, *datalen - sizeof(struct ast_iax2_mini_enc_hdr));
   }
   return 0;
}

static int encrypt_frame(aes_encrypt_ctx *ecx, struct ast_iax2_full_hdr *fh, unsigned char *poo, int *datalen)
{
   int padding;
   unsigned char *workspace;
   workspace = alloca(*datalen + 32);
   if (!workspace)
      return -1;
   if (ntohs(fh->scallno) & IAX_FLAG_FULL) {
      struct ast_iax2_full_enc_hdr *efh = (struct ast_iax2_full_enc_hdr *)fh;
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Encoding full frame %d/%d with length %d\n", fh->type, fh->csub, *datalen);
      padding = 16 - ((*datalen - sizeof(struct ast_iax2_full_enc_hdr)) % 16);
      padding = 16 + (padding & 0xf);
      memcpy(workspace, poo, padding);
      memcpy(workspace + padding, efh->encdata, *datalen - sizeof(struct ast_iax2_full_enc_hdr));
      workspace[15] &= 0xf0;
      workspace[15] |= (padding & 0xf);
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Encoding full frame %d/%d with length %d + %d padding (15=%02x)\n", fh->type, fh->csub, *datalen, padding, workspace[15]);
      *datalen += padding;
      memcpy_encrypt(efh->encdata, workspace, *datalen - sizeof(struct ast_iax2_full_enc_hdr), ecx);
      if (*datalen >= 32 + sizeof(struct ast_iax2_full_enc_hdr))
         memcpy(poo, workspace + *datalen - 32, 32);
   } else {
      struct ast_iax2_mini_enc_hdr *efh = (struct ast_iax2_mini_enc_hdr *)fh;
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Encoding mini frame with length %d\n", *datalen);
      padding = 16 - ((*datalen - sizeof(struct ast_iax2_mini_enc_hdr)) % 16);
      padding = 16 + (padding & 0xf);
      memcpy(workspace, poo, padding);
      memcpy(workspace + padding, efh->encdata, *datalen - sizeof(struct ast_iax2_mini_enc_hdr));
      workspace[15] &= 0xf0;
      workspace[15] |= (padding & 0x0f);
      *datalen += padding;
      memcpy_encrypt(efh->encdata, workspace, *datalen - sizeof(struct ast_iax2_mini_enc_hdr), ecx);
      if (*datalen >= 32 + sizeof(struct ast_iax2_mini_enc_hdr))
         memcpy(poo, workspace + *datalen - 32, 32);
   }
   return 0;
}

static int decrypt_frame(int callno, struct ast_iax2_full_hdr *fh, struct ast_frame *f, int *datalen)
{
   int res=-1;
   if (!ast_test_flag(iaxs[callno], IAX_KEYPOPULATED)) {
      /* Search for possible keys, given secrets */
      struct MD5Context md5;
      unsigned char digest[16];
      char *tmppw, *stringp;
      
      tmppw = ast_strdupa(iaxs[callno]->secret);
      stringp = tmppw;
      while ((tmppw = strsep(&stringp, ";"))) {
         MD5Init(&md5);
         MD5Update(&md5, (unsigned char *)iaxs[callno]->challenge, strlen(iaxs[callno]->challenge));
         MD5Update(&md5, (unsigned char *)tmppw, strlen(tmppw));
         MD5Final(digest, &md5);
         build_encryption_keys(digest, iaxs[callno]);
         res = decode_frame(&iaxs[callno]->dcx, fh, f, datalen);
         if (!res) {
            ast_set_flag(iaxs[callno], IAX_KEYPOPULATED);
            break;
         }
      }
   } else 
      res = decode_frame(&iaxs[callno]->dcx, fh, f, datalen);
   return res;
}

static int iax2_send(struct chan_iax2_pvt *pvt, struct ast_frame *f, unsigned int ts, int seqno, int now, int transfer, int final)
{
   /* Queue a packet for delivery on a given private structure.  Use "ts" for
      timestamp, or calculate if ts is 0.  Send immediately without retransmission
      or delayed, with retransmission */
   struct ast_iax2_full_hdr *fh;
   struct ast_iax2_mini_hdr *mh;
   struct ast_iax2_video_hdr *vh;
   struct {
      struct iax_frame fr2;
      unsigned char buffer[4096];
   } frb;
   struct iax_frame *fr;
   int res;
   int sendmini=0;
   unsigned int lastsent;
   unsigned int fts;

   frb.fr2.afdatalen = sizeof(frb.buffer);

   if (!pvt) {
      ast_log(LOG_WARNING, "No private structure for packet?\n");
      return -1;
   }
   
   lastsent = pvt->lastsent;

   /* Calculate actual timestamp */
   fts = calc_timestamp(pvt, ts, f);

   /* Bail here if this is an "interp" frame; we don't want or need to send these placeholders out
    * (the endpoint should detect the lost packet itself).  But, we want to do this here, so that we
    * increment the "predicted timestamps" for voice, if we're predecting */
   if(f->frametype == AST_FRAME_VOICE && f->datalen == 0)
       return 0;


   if ((ast_test_flag(pvt, IAX_TRUNK) || 
         (((fts & 0xFFFF0000L) == (lastsent & 0xFFFF0000L)) ||
         ((fts & 0xFFFF0000L) == ((lastsent + 0x10000) & 0xFFFF0000L))))
      /* High two bytes are the same on timestamp, or sending on a trunk */ &&
       (f->frametype == AST_FRAME_VOICE) 
      /* is a voice frame */ &&
      (f->subclass == pvt->svoiceformat) 
      /* is the same type */ ) {
         /* Force immediate rather than delayed transmission */
         now = 1;
         /* Mark that mini-style frame is appropriate */
         sendmini = 1;
   }
   if ( f->frametype == AST_FRAME_VIDEO ) {
      /*
       * If the lower 15 bits of the timestamp roll over, or if
       * the video format changed then send a full frame.
       * Otherwise send a mini video frame
       */
      if (((fts & 0xFFFF8000L) == (pvt->lastvsent & 0xFFFF8000L)) &&
          ((f->subclass & ~0x1) == pvt->svideoformat)
         ) {
         now = 1;
         sendmini = 1;
      } else {
         now = 0;
         sendmini = 0;
      }
      pvt->lastvsent = fts;
   }
   /* Allocate an iax_frame */
   if (now) {
      fr = &frb.fr2;
   } else
      fr = iax_frame_new(DIRECTION_OUTGRESS, ast_test_flag(pvt, IAX_ENCRYPTED) ? f->datalen + 32 : f->datalen, (f->frametype == AST_FRAME_VOICE) || (f->frametype == AST_FRAME_VIDEO));
   if (!fr) {
      ast_log(LOG_WARNING, "Out of memory\n");
      return -1;
   }
   /* Copy our prospective frame into our immediate or retransmitted wrapper */
   iax_frame_wrap(fr, f);

   fr->ts = fts;
   fr->callno = pvt->callno;
   fr->transfer = transfer;
   fr->final = final;
   fr->encmethods = 0;
   if (!sendmini) {
      /* We need a full frame */
      if (seqno > -1)
         fr->oseqno = seqno;
      else
         fr->oseqno = pvt->oseqno++;
      fr->iseqno = pvt->iseqno;
      fh = (struct ast_iax2_full_hdr *)(fr->af.data - sizeof(struct ast_iax2_full_hdr));
      fh->scallno = htons(fr->callno | IAX_FLAG_FULL);
      fh->ts = htonl(fr->ts);
      fh->oseqno = fr->oseqno;
      if (transfer) {
         fh->iseqno = 0;
      } else
         fh->iseqno = fr->iseqno;
      /* Keep track of the last thing we've acknowledged */
      if (!transfer)
         pvt->aseqno = fr->iseqno;
      fh->type = fr->af.frametype & 0xFF;
      if (fr->af.frametype == AST_FRAME_VIDEO)
         fh->csub = compress_subclass(fr->af.subclass & ~0x1) | ((fr->af.subclass & 0x1) << 6);
      else
         fh->csub = compress_subclass(fr->af.subclass);
      if (transfer) {
         fr->dcallno = pvt->transfercallno;
      } else
         fr->dcallno = pvt->peercallno;
      fh->dcallno = htons(fr->dcallno);
      fr->datalen = fr->af.datalen + sizeof(struct ast_iax2_full_hdr);
      fr->data = fh;
      fr->retries = 0;
      /* Retry after 2x the ping time has passed */
      fr->retrytime = pvt->pingtime * 2;
      if (fr->retrytime < MIN_RETRY_TIME)
         fr->retrytime = MIN_RETRY_TIME;
      if (fr->retrytime > MAX_RETRY_TIME)
         fr->retrytime = MAX_RETRY_TIME;
      /* Acks' don't get retried */
      if ((f->frametype == AST_FRAME_IAX) && (f->subclass == IAX_COMMAND_ACK))
         fr->retries = -1;
      else if (f->frametype == AST_FRAME_VOICE)
         pvt->svoiceformat = f->subclass;
      else if (f->frametype == AST_FRAME_VIDEO)
         pvt->svideoformat = f->subclass & ~0x1;
      if (ast_test_flag(pvt, IAX_ENCRYPTED)) {
         if (ast_test_flag(pvt, IAX_KEYPOPULATED)) {
            if (iaxdebug) {
               if (fr->transfer)
                  iax_showframe(fr, NULL, 2, &pvt->transfer, fr->datalen - sizeof(struct ast_iax2_full_hdr));
               else
                  iax_showframe(fr, NULL, 2, &pvt->addr, fr->datalen - sizeof(struct ast_iax2_full_hdr));
            }
            encrypt_frame(&pvt->ecx, fh, pvt->semirand, &fr->datalen);
            fr->encmethods = pvt->encmethods;
            fr->ecx = pvt->ecx;
            fr->mydcx = pvt->mydcx;
            memcpy(fr->semirand, pvt->semirand, sizeof(fr->semirand));
         } else
            ast_log(LOG_WARNING, "Supposed to send packet encrypted, but no key?\n");
      }
   
      if (now) {
         res = send_packet(fr);
      } else
         res = iax2_transmit(fr);
   } else {
      if (ast_test_flag(pvt, IAX_TRUNK)) {
         iax2_trunk_queue(pvt, fr);
         res = 0;
      } else if (fr->af.frametype == AST_FRAME_VIDEO) {
         /* Video frame have no sequence number */
         fr->oseqno = -1;
         fr->iseqno = -1;
         vh = (struct ast_iax2_video_hdr *)(fr->af.data - sizeof(struct ast_iax2_video_hdr));
         vh->zeros = 0;
         vh->callno = htons(0x8000 | fr->callno);
         vh->ts = htons((fr->ts & 0x7FFF) | (fr->af.subclass & 0x1 ? 0x8000 : 0));
         fr->datalen = fr->af.datalen + sizeof(struct ast_iax2_video_hdr);
         fr->data = vh;
         fr->retries = -1;
         res = send_packet(fr);        
      } else {
         /* Mini-frames have no sequence number */
         fr->oseqno = -1;
         fr->iseqno = -1;
         /* Mini frame will do */
         mh = (struct ast_iax2_mini_hdr *)(fr->af.data - sizeof(struct ast_iax2_mini_hdr));
         mh->callno = htons(fr->callno);
         mh->ts = htons(fr->ts & 0xFFFF);
         fr->datalen = fr->af.datalen + sizeof(struct ast_iax2_mini_hdr);
         fr->data = mh;
         fr->retries = -1;
         if (pvt->transferring == TRANSFER_MEDIAPASS)
            fr->transfer = 1;
         if (ast_test_flag(pvt, IAX_ENCRYPTED)) {
            if (ast_test_flag(pvt, IAX_KEYPOPULATED)) {
               encrypt_frame(&pvt->ecx, (struct ast_iax2_full_hdr *)mh, pvt->semirand, &fr->datalen);
            } else
               ast_log(LOG_WARNING, "Supposed to send packet encrypted, but no key?\n");
         }
         res = send_packet(fr);
      }
   }
   return res;
}

static int iax2_show_users(int fd, int argc, char *argv[])
{
   regex_t regexbuf;
   int havepattern = 0;

#define FORMAT "%-15.15s  %-20.20s  %-15.15s  %-15.15s  %-5.5s  %-5.10s\n"
#define FORMAT2 "%-15.15s  %-20.20s  %-15.15d  %-15.15s  %-5.5s  %-5.10s\n"

   struct iax2_user *user = NULL;
   char auth[90];
   char *pstr = "";
   struct ao2_iterator i;

   switch (argc) {
   case 5:
      if (!strcasecmp(argv[3], "like")) {
         if (regcomp(&regexbuf, argv[4], REG_EXTENDED | REG_NOSUB))
            return RESULT_SHOWUSAGE;
         havepattern = 1;
      } else
         return RESULT_SHOWUSAGE;
   case 3:
      break;
   default:
      return RESULT_SHOWUSAGE;
   }

   ast_cli(fd, FORMAT, "Username", "Secret", "Authen", "Def.Context", "A/C","Codec Pref");
   i = ao2_iterator_init(users, 0);
   for (user = ao2_iterator_next(&i); user; 
      user_unref(user), user = ao2_iterator_next(&i)) {
      if (havepattern && regexec(&regexbuf, user->name, 0, NULL, 0))
         continue;
      
      if (!ast_strlen_zero(user->secret)) {
         ast_copy_string(auth,user->secret,sizeof(auth));
      } else if (!ast_strlen_zero(user->inkeys)) {
         snprintf(auth, sizeof(auth), "Key: %-15.15s ", user->inkeys);
      } else
         ast_copy_string(auth, "-no secret-", sizeof(auth));
      
      if(ast_test_flag(user,IAX_CODEC_NOCAP))
         pstr = "REQ Only";
      else if(ast_test_flag(user,IAX_CODEC_NOPREFS))
         pstr = "Disabled";
      else
         pstr = ast_test_flag(user,IAX_CODEC_USER_FIRST) ? "Caller" : "Host";
      
      ast_cli(fd, FORMAT2, user->name, auth, user->authmethods, 
         user->contexts ? user->contexts->context : context,
         user->ha ? "Yes" : "No", pstr);
   }

   if (havepattern)
      regfree(&regexbuf);

   return RESULT_SUCCESS;
#undef FORMAT
#undef FORMAT2
}

static int __iax2_show_peers(int manager, int fd, struct mansession *s, int argc, char *argv[])
{
   regex_t regexbuf;
   int havepattern = 0;
   int total_peers = 0;
   int online_peers = 0;
   int offline_peers = 0;
   int unmonitored_peers = 0;
   struct ao2_iterator i;

#define FORMAT2 "%-15.15s  %-15.15s %s  %-15.15s  %-8s  %s %-10s%s"
#define FORMAT "%-15.15s  %-15.15s %s  %-15.15s  %-5d%s  %s %-10s%s"

   struct iax2_peer *peer = NULL;
   char name[256];
   int registeredonly=0;
   char *term = manager ? "\r\n" : "\n";

   switch (argc) {
   case 6:
      if (!strcasecmp(argv[3], "registered"))
         registeredonly = 1;
      else
         return RESULT_SHOWUSAGE;
      if (!strcasecmp(argv[4], "like")) {
         if (regcomp(&regexbuf, argv[5], REG_EXTENDED | REG_NOSUB))
            return RESULT_SHOWUSAGE;
         havepattern = 1;
      } else
         return RESULT_SHOWUSAGE;
      break;
   case 5:
      if (!strcasecmp(argv[3], "like")) {
         if (regcomp(&regexbuf, argv[4], REG_EXTENDED | REG_NOSUB))
            return RESULT_SHOWUSAGE;
         havepattern = 1;
      } else
         return RESULT_SHOWUSAGE;
      break;
   case 4:
      if (!strcasecmp(argv[3], "registered"))
         registeredonly = 1;
      else
         return RESULT_SHOWUSAGE;
      break;
   case 3:
      break;
   default:
      return RESULT_SHOWUSAGE;
   }


   if (s)
      astman_append(s, FORMAT2, "Name/Username", "Host", "   ", "Mask", "Port", "   ", "Status", term);
   else
      ast_cli(fd, FORMAT2, "Name/Username", "Host", "   ", "Mask", "Port", "   ", "Status", term);

   i = ao2_iterator_init(peers, 0);
   for (peer = ao2_iterator_next(&i); peer; 
      peer_unref(peer), peer = ao2_iterator_next(&i)) {
      char nm[20];
      char status[20];
      char srch[2000];
      int retstatus;

      if (registeredonly && !peer->addr.sin_addr.s_addr)
         continue;
      if (havepattern && regexec(&regexbuf, peer->name, 0, NULL, 0))
         continue;

      if (!ast_strlen_zero(peer->username))
         snprintf(name, sizeof(name), "%s/%s", peer->name, peer->username);
      else
         ast_copy_string(name, peer->name, sizeof(name));
      
      retstatus = peer_status(peer, status, sizeof(status));
      if (retstatus > 0)
         online_peers++;
      else if (!retstatus)
         offline_peers++;
      else
         unmonitored_peers++;
      
      ast_copy_string(nm, ast_inet_ntoa(peer->mask), sizeof(nm));
      
      snprintf(srch, sizeof(srch), FORMAT, name, 
          peer->addr.sin_addr.s_addr ? ast_inet_ntoa(peer->addr.sin_addr) : "(Unspecified)",
          ast_test_flag(peer, IAX_DYNAMIC) ? "(D)" : "(S)",
          nm,
          ntohs(peer->addr.sin_port), ast_test_flag(peer, IAX_TRUNK) ? "(T)" : "   ",
          peer->encmethods ? "(E)" : "   ", status, term);
      
      if (s)
         astman_append(s, FORMAT, name, 
                  peer->addr.sin_addr.s_addr ? ast_inet_ntoa( peer->addr.sin_addr) : "(Unspecified)",
                  ast_test_flag(peer, IAX_DYNAMIC) ? "(D)" : "(S)",
                  nm,
                  ntohs(peer->addr.sin_port), ast_test_flag(peer, IAX_TRUNK) ? "(T)" : "   ",
                  peer->encmethods ? "(E)" : "   ", status, term);
      else
         ast_cli(fd, FORMAT, name, 
            peer->addr.sin_addr.s_addr ? ast_inet_ntoa(peer->addr.sin_addr) : "(Unspecified)",
            ast_test_flag(peer, IAX_DYNAMIC) ? "(D)" : "(S)",
            nm,
            ntohs(peer->addr.sin_port), ast_test_flag(peer, IAX_TRUNK) ? "(T)" : "   ",
            peer->encmethods ? "(E)" : "   ", status, term);
      total_peers++;
   }

   if (s)
      astman_append(s,"%d iax2 peers [%d online, %d offline, %d unmonitored]%s", total_peers, online_peers, offline_peers, unmonitored_peers, term);
   else
      ast_cli(fd,"%d iax2 peers [%d online, %d offline, %d unmonitored]%s", total_peers, online_peers, offline_peers, unmonitored_peers, term);

   if (havepattern)
      regfree(&regexbuf);

   return RESULT_SUCCESS;
#undef FORMAT
#undef FORMAT2
}

static int iax2_show_threads(int fd, int argc, char *argv[])
{
   struct iax2_thread *thread = NULL;
   time_t t;
   int threadcount = 0, dynamiccount = 0;
   char type;

   if (argc != 3)
      return RESULT_SHOWUSAGE;
      
   ast_cli(fd, "IAX2 Thread Information\n");
   time(&t);
   ast_cli(fd, "Idle Threads:\n");
   AST_LIST_LOCK(&idle_list);
   AST_LIST_TRAVERSE(&idle_list, thread, list) {
#ifdef DEBUG_SCHED_MULTITHREAD
      ast_cli(fd, "Thread %d: state=%d, update=%d, actions=%d, func ='%s'\n", 
         thread->threadnum, thread->iostate, (int)(t - thread->checktime), thread->actions, thread->curfunc);
#else
      ast_cli(fd, "Thread %d: state=%d, update=%d, actions=%d\n", 
         thread->threadnum, thread->iostate, (int)(t - thread->checktime), thread->actions);
#endif
      threadcount++;
   }
   AST_LIST_UNLOCK(&idle_list);
   ast_cli(fd, "Active Threads:\n");
   AST_LIST_LOCK(&active_list);
   AST_LIST_TRAVERSE(&active_list, thread, list) {
      if (thread->type == IAX_TYPE_DYNAMIC)
         type = 'D';
      else
         type = 'P';
#ifdef DEBUG_SCHED_MULTITHREAD
      ast_cli(fd, "Thread %c%d: state=%d, update=%d, actions=%d, func ='%s'\n", 
         type, thread->threadnum, thread->iostate, (int)(t - thread->checktime), thread->actions, thread->curfunc);
#else
      ast_cli(fd, "Thread %c%d: state=%d, update=%d, actions=%d\n", 
         type, thread->threadnum, thread->iostate, (int)(t - thread->checktime), thread->actions);
#endif
      threadcount++;
   }
   AST_LIST_UNLOCK(&active_list);
   ast_cli(fd, "Dynamic Threads:\n");
        AST_LIST_LOCK(&dynamic_list);
        AST_LIST_TRAVERSE(&dynamic_list, thread, list) {
#ifdef DEBUG_SCHED_MULTITHREAD
                ast_cli(fd, "Thread %d: state=%d, update=%d, actions=%d, func ='%s'\n",
                        thread->threadnum, thread->iostate, (int)(t - thread->checktime), thread->actions, thread->curfunc);
#else
                ast_cli(fd, "Thread %d: state=%d, update=%d, actions=%d\n",
                        thread->threadnum, thread->iostate, (int)(t - thread->checktime), thread->actions);
#endif
      dynamiccount++;
        }
        AST_LIST_UNLOCK(&dynamic_list);
   ast_cli(fd, "%d of %d threads accounted for with %d dynamic threads\n", threadcount, iaxthreadcount, dynamiccount);
   return RESULT_SUCCESS;
}

static int iax2_show_peers(int fd, int argc, char *argv[])
{
   return __iax2_show_peers(0, fd, NULL, argc, argv);
}
static int manager_iax2_show_netstats(struct mansession *s, const struct message *m)
{
   ast_cli_netstats(s, -1, 0);
   astman_append(s, "\r\n");
   return RESULT_SUCCESS;
}

static int iax2_show_firmware(int fd, int argc, char *argv[])
{
#define FORMAT2 "%-15.15s  %-15.15s %-15.15s\n"
#if !defined(__FreeBSD__)
#define FORMAT "%-15.15s  %-15d %-15d\n"
#else /* __FreeBSD__ */
#define FORMAT "%-15.15s  %-15d %-15d\n" /* XXX 2.95 ? */
#endif /* __FreeBSD__ */
   struct iax_firmware *cur;
   if ((argc != 3) && (argc != 4))
      return RESULT_SHOWUSAGE;
   ast_mutex_lock(&waresl.lock);
   
   ast_cli(fd, FORMAT2, "Device", "Version", "Size");
   for (cur = waresl.wares;cur;cur = cur->next) {
      if ((argc == 3) || (!strcasecmp(argv[3], (char *)cur->fwh->devname))) 
         ast_cli(fd, FORMAT, cur->fwh->devname, ntohs(cur->fwh->version),
            (int)ntohl(cur->fwh->datalen));
   }
   ast_mutex_unlock(&waresl.lock);
   return RESULT_SUCCESS;
#undef FORMAT
#undef FORMAT2
}

/* JDG: callback to display iax peers in manager */
static int manager_iax2_show_peers(struct mansession *s, const struct message *m)
{
   char *a[] = { "iax2", "show", "users" };
   int ret;
   const char *id = astman_get_header(m,"ActionID");

   if (!ast_strlen_zero(id))
      astman_append(s, "ActionID: %s\r\n",id);
   ret = __iax2_show_peers(1, -1, s, 3, a );
   astman_append(s, "\r\n\r\n" );
   return ret;
} /* /JDG */

static char *regstate2str(int regstate)
{
   switch(regstate) {
   case REG_STATE_UNREGISTERED:
      return "Unregistered";
   case REG_STATE_REGSENT:
      return "Request Sent";
   case REG_STATE_AUTHSENT:
      return "Auth. Sent";
   case REG_STATE_REGISTERED:
      return "Registered";
   case REG_STATE_REJECTED:
      return "Rejected";
   case REG_STATE_TIMEOUT:
      return "Timeout";
   case REG_STATE_NOAUTH:
      return "No Authentication";
   default:
      return "Unknown";
   }
}

static int iax2_show_registry(int fd, int argc, char *argv[])
{
#define FORMAT2 "%-20.20s  %-6.6s  %-10.10s  %-20.20s %8.8s  %s\n"
#define FORMAT  "%-20.20s  %-6.6s  %-10.10s  %-20.20s %8d  %s\n"
   struct iax2_registry *reg = NULL;

   char host[80];
   char perceived[80];
   if (argc != 3)
      return RESULT_SHOWUSAGE;
   ast_cli(fd, FORMAT2, "Host", "dnsmgr", "Username", "Perceived", "Refresh", "State");
   AST_LIST_LOCK(&registrations);
   AST_LIST_TRAVERSE(&registrations, reg, entry) {
      snprintf(host, sizeof(host), "%s:%d", ast_inet_ntoa(reg->addr.sin_addr), ntohs(reg->addr.sin_port));
      if (reg->us.sin_addr.s_addr) 
         snprintf(perceived, sizeof(perceived), "%s:%d", ast_inet_ntoa(reg->us.sin_addr), ntohs(reg->us.sin_port));
      else
         ast_copy_string(perceived, "<Unregistered>", sizeof(perceived));
      ast_cli(fd, FORMAT, host, 
               (reg->dnsmgr) ? "Y" : "N", 
               reg->username, perceived, reg->refresh, regstate2str(reg->regstate));
   }
   AST_LIST_UNLOCK(&registrations);
   return RESULT_SUCCESS;
#undef FORMAT
#undef FORMAT2
}

static int iax2_show_channels(int fd, int argc, char *argv[])
{
#define FORMAT2 "%-20.20s  %-15.15s  %-10.10s  %-11.11s  %-11.11s  %-7.7s  %-6.6s  %-6.6s  %s\n"
#define FORMAT  "%-20.20s  %-15.15s  %-10.10s  %5.5d/%5.5d  %5.5d/%5.5d  %-5.5dms  %-4.4dms  %-4.4dms  %-6.6s\n"
#define FORMATB "%-20.20s  %-15.15s  %-10.10s  %5.5d/%5.5d  %5.5d/%5.5d  [Native Bridged to ID=%5.5d]\n"
   int x;
   int numchans = 0;

   if (argc != 3)
      return RESULT_SHOWUSAGE;
   ast_cli(fd, FORMAT2, "Channel", "Peer", "Username", "ID (Lo/Rem)", "Seq (Tx/Rx)", "Lag", "Jitter", "JitBuf", "Format");
   for (x = 0; x < ARRAY_LEN(iaxs); x++) {
      ast_mutex_lock(&iaxsl[x]);
      if (iaxs[x]) {
         int lag, jitter, localdelay;
         jb_info jbinfo;
         
         if(ast_test_flag(iaxs[x], IAX_USEJITTERBUF)) {
            jb_getinfo(iaxs[x]->jb, &jbinfo);
            jitter = jbinfo.jitter;
            localdelay = jbinfo.current - jbinfo.min;
         } else {
            jitter = -1;
            localdelay = 0;
         }
         lag = iaxs[x]->remote_rr.delay;
         ast_cli(fd, FORMAT,
            iaxs[x]->owner ? iaxs[x]->owner->name : "(None)",
            ast_inet_ntoa(iaxs[x]->addr.sin_addr), 
            S_OR(iaxs[x]->username, "(None)"),
            iaxs[x]->callno, iaxs[x]->peercallno,
            iaxs[x]->oseqno, iaxs[x]->iseqno,
            lag,
            jitter,
            localdelay,
            ast_getformatname(iaxs[x]->voiceformat) );
         numchans++;
      }
      ast_mutex_unlock(&iaxsl[x]);
   }
   ast_cli(fd, "%d active IAX channel%s\n", numchans, (numchans != 1) ? "s" : "");
   return RESULT_SUCCESS;
#undef FORMAT
#undef FORMAT2
#undef FORMATB
}

static int ast_cli_netstats(struct mansession *s, int fd, int limit_fmt)
{
   int x;
   int numchans = 0;
   for (x = 0; x < ARRAY_LEN(iaxs); x++) {
      ast_mutex_lock(&iaxsl[x]);
      if (iaxs[x]) {
         int localjitter, localdelay, locallost, locallosspct, localdropped, localooo;
         char *fmt;
         jb_info jbinfo;
         
         if(ast_test_flag(iaxs[x], IAX_USEJITTERBUF)) {
            jb_getinfo(iaxs[x]->jb, &jbinfo);
            localjitter = jbinfo.jitter;
            localdelay = jbinfo.current - jbinfo.min;
            locallost = jbinfo.frames_lost;
            locallosspct = jbinfo.losspct/1000;
            localdropped = jbinfo.frames_dropped;
            localooo = jbinfo.frames_ooo;
         } else {
            localjitter = -1;
            localdelay = 0;
            locallost = -1;
            locallosspct = -1;
            localdropped = 0;
            localooo = -1;
         }
         if (limit_fmt)
            fmt = "%-25.25s %4d %4d %4d %5d %3d %5d %4d %6d %4d %4d %5d %3d %5d %4d %6d\n";
         else
            fmt = "%s %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d\n";
         if (s)
            
            astman_append(s, fmt,
                     iaxs[x]->owner ? iaxs[x]->owner->name : "(None)",
                     iaxs[x]->pingtime,
                     localjitter, 
                     localdelay,
                     locallost,
                     locallosspct,
                     localdropped,
                     localooo,
                     iaxs[x]->frames_received/1000,
                     iaxs[x]->remote_rr.jitter,
                     iaxs[x]->remote_rr.delay,
                     iaxs[x]->remote_rr.losscnt,
                     iaxs[x]->remote_rr.losspct,
                     iaxs[x]->remote_rr.dropped,
                     iaxs[x]->remote_rr.ooo,
                     iaxs[x]->remote_rr.packets/1000);
         else
            ast_cli(fd, fmt,
               iaxs[x]->owner ? iaxs[x]->owner->name : "(None)",
               iaxs[x]->pingtime,
               localjitter, 
               localdelay,
               locallost,
               locallosspct,
               localdropped,
               localooo,
               iaxs[x]->frames_received/1000,
               iaxs[x]->remote_rr.jitter,
               iaxs[x]->remote_rr.delay,
               iaxs[x]->remote_rr.losscnt,
               iaxs[x]->remote_rr.losspct,
               iaxs[x]->remote_rr.dropped,
               iaxs[x]->remote_rr.ooo,
               iaxs[x]->remote_rr.packets/1000
               );
         numchans++;
      }
      ast_mutex_unlock(&iaxsl[x]);
   }
   return numchans;
}

static int iax2_show_netstats(int fd, int argc, char *argv[])
{
   int numchans = 0;
   if (argc != 3)
      return RESULT_SHOWUSAGE;
   ast_cli(fd, "                                -------- LOCAL ---------------------  -------- REMOTE --------------------\n");
   ast_cli(fd, "Channel                    RTT  Jit  Del  Lost   %%  Drop  OOO  Kpkts  Jit  Del  Lost   %%  Drop  OOO  Kpkts\n");
   numchans = ast_cli_netstats(NULL, fd, 1);
   ast_cli(fd, "%d active IAX channel%s\n", numchans, (numchans != 1) ? "s" : "");
   return RESULT_SUCCESS;
}

static int iax2_do_debug(int fd, int argc, char *argv[])
{
   if (argc < 2 || argc > 3)
      return RESULT_SHOWUSAGE;
   iaxdebug = 1;
   ast_cli(fd, "IAX2 Debugging Enabled\n");
   return RESULT_SUCCESS;
}

static int iax2_do_trunk_debug(int fd, int argc, char *argv[])
{
   if (argc < 3 || argc > 4)
      return RESULT_SHOWUSAGE;
   iaxtrunkdebug = 1;
   ast_cli(fd, "IAX2 Trunk Debug Requested\n");
   return RESULT_SUCCESS;
}

static int iax2_do_jb_debug(int fd, int argc, char *argv[])
{
   if (argc < 3 || argc > 4)
      return RESULT_SHOWUSAGE;
   jb_setoutput(jb_error_output, jb_warning_output, jb_debug_output);
   ast_cli(fd, "IAX2 Jitterbuffer Debugging Enabled\n");
   return RESULT_SUCCESS;
}

static int iax2_no_debug(int fd, int argc, char *argv[])
{
   if (argc < 3 || argc > 4)
      return RESULT_SHOWUSAGE;
   iaxdebug = 0;
   ast_cli(fd, "IAX2 Debugging Disabled\n");
   return RESULT_SUCCESS;
}

static int iax2_no_trunk_debug(int fd, int argc, char *argv[])
{
   if (argc < 4 || argc > 5)
      return RESULT_SHOWUSAGE;
   iaxtrunkdebug = 0;
   ast_cli(fd, "IAX2 Trunk Debugging Disabled\n");
   return RESULT_SUCCESS;
}

static int iax2_no_jb_debug(int fd, int argc, char *argv[])
{
   if (argc < 4 || argc > 5)
      return RESULT_SHOWUSAGE;
   jb_setoutput(jb_error_output, jb_warning_output, NULL);
   jb_debug_output("\n");
   ast_cli(fd, "IAX2 Jitterbuffer Debugging Disabled\n");
   return RESULT_SUCCESS;
}

static int iax2_write(struct ast_channel *c, struct ast_frame *f)
{
   unsigned short callno = PTR_TO_CALLNO(c->tech_pvt);
   int res = -1;
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
   /* If there's an outstanding error, return failure now */
      if (!iaxs[callno]->error) {
         if (ast_test_flag(iaxs[callno], IAX_ALREADYGONE))
            res = 0;
            /* Don't waste bandwidth sending null frames */
         else if (f->frametype == AST_FRAME_NULL)
            res = 0;
         else if ((f->frametype == AST_FRAME_VOICE) && ast_test_flag(iaxs[callno], IAX_QUELCH))
            res = 0;
         else if (!ast_test_flag(&iaxs[callno]->state, IAX_STATE_STARTED))
            res = 0;
         else
         /* Simple, just queue for transmission */
            res = iax2_send(iaxs[callno], f, 0, -1, 0, 0, 0);
      } else {
         if (option_debug)
            ast_log(LOG_DEBUG, "Write error: %s\n", strerror(errno));
      }
   }
   /* If it's already gone, just return */
   ast_mutex_unlock(&iaxsl[callno]);
   return res;
}

static int __send_command(struct chan_iax2_pvt *i, char type, int command, unsigned int ts, const unsigned char *data, int datalen, int seqno, 
      int now, int transfer, int final)
{
   struct ast_frame f = { 0, };

   f.frametype = type;
   f.subclass = command;
   f.datalen = datalen;
   f.src = __FUNCTION__;
   f.data = (void *) data;

   return iax2_send(i, &f, ts, seqno, now, transfer, final);
}

static int send_command(struct chan_iax2_pvt *i, char type, int command, unsigned int ts, const unsigned char *data, int datalen, int seqno)
{
   return __send_command(i, type, command, ts, data, datalen, seqno, 0, 0, 0);
}

static int send_command_locked(unsigned short callno, char type, int command, unsigned int ts, const unsigned char *data, int datalen, int seqno)
{
   int res;
   ast_mutex_lock(&iaxsl[callno]);
   res = send_command(iaxs[callno], type, command, ts, data, datalen, seqno);
   ast_mutex_unlock(&iaxsl[callno]);
   return res;
}

/*!
 * \note Since this function calls iax2_predestroy() -> iax2_queue_hangup(),
 *       the pvt struct for the given call number may disappear during its 
 *       execution.
 */
static int send_command_final(struct chan_iax2_pvt *i, char type, int command, unsigned int ts, const unsigned char *data, int datalen, int seqno)
{
   int call_num = i->callno;
   /* It is assumed that the callno has already been locked */
   iax2_predestroy(i->callno);
   if (!iaxs[call_num])
      return -1;
   return __send_command(i, type, command, ts, data, datalen, seqno, 0, 0, 1);
}

static int send_command_immediate(struct chan_iax2_pvt *i, char type, int command, unsigned int ts, const unsigned char *data, int datalen, int seqno)
{
   return __send_command(i, type, command, ts, data, datalen, seqno, 1, 0, 0);
}

static int send_command_transfer(struct chan_iax2_pvt *i, char type, int command, unsigned int ts, const unsigned char *data, int datalen)
{
   return __send_command(i, type, command, ts, data, datalen, 0, 0, 1, 0);
}

static int apply_context(struct iax2_context *con, const char *context)
{
   while(con) {
      if (!strcmp(con->context, context) || !strcmp(con->context, "*"))
         return -1;
      con = con->next;
   }
   return 0;
}


static int check_access(int callno, struct sockaddr_in *sin, struct iax_ies *ies)
{
   /* Start pessimistic */
   int res = -1;
   int version = 2;
   struct iax2_user *user = NULL, *best = NULL;
   int bestscore = 0;
   int gotcapability = 0;
   struct ast_variable *v = NULL, *tmpvar = NULL;
   struct ao2_iterator i;

   if (!iaxs[callno])
      return res;
   if (ies->called_number)
      ast_string_field_set(iaxs[callno], exten, ies->called_number);
   if (ies->calling_number) {
      ast_shrink_phone_number(ies->calling_number);
      ast_string_field_set(iaxs[callno], cid_num, ies->calling_number);
   }
   if (ies->calling_name)
      ast_string_field_set(iaxs[callno], cid_name, ies->calling_name);
   if (ies->calling_ani)
      ast_string_field_set(iaxs[callno], ani, ies->calling_ani);
   if (ies->dnid)
      ast_string_field_set(iaxs[callno], dnid, ies->dnid);
   if (ies->rdnis)
      ast_string_field_set(iaxs[callno], rdnis, ies->rdnis);
   if (ies->called_context)
      ast_string_field_set(iaxs[callno], context, ies->called_context);
   if (ies->language)
      ast_string_field_set(iaxs[callno], language, ies->language);
   if (ies->username)
      ast_string_field_set(iaxs[callno], username, ies->username);
   if (ies->calling_ton > -1)
      iaxs[callno]->calling_ton = ies->calling_ton;
   if (ies->calling_tns > -1)
      iaxs[callno]->calling_tns = ies->calling_tns;
   if (ies->calling_pres > -1)
      iaxs[callno]->calling_pres = ies->calling_pres;
   if (ies->format)
      iaxs[callno]->peerformat = ies->format;
   if (ies->adsicpe)
      iaxs[callno]->peeradsicpe = ies->adsicpe;
   if (ies->capability) {
      gotcapability = 1;
      iaxs[callno]->peercapability = ies->capability;
   } 
   if (ies->version)
      version = ies->version;

   /* Use provided preferences until told otherwise for actual preferences */
   if(ies->codec_prefs) {
      ast_codec_pref_convert(&iaxs[callno]->rprefs, ies->codec_prefs, 32, 0);
      ast_codec_pref_convert(&iaxs[callno]->prefs, ies->codec_prefs, 32, 0);
   }

   if (!gotcapability) 
      iaxs[callno]->peercapability = iaxs[callno]->peerformat;
   if (version > IAX_PROTO_VERSION) {
      ast_log(LOG_WARNING, "Peer '%s' has too new a protocol version (%d) for me\n", 
         ast_inet_ntoa(sin->sin_addr), version);
      return res;
   }
   /* Search the userlist for a compatible entry, and fill in the rest */
   i = ao2_iterator_init(users, 0);
   while ((user = ao2_iterator_next(&i))) {
      if ((ast_strlen_zero(iaxs[callno]->username) ||          /* No username specified */
         !strcmp(iaxs[callno]->username, user->name)) /* Or this username specified */
         && ast_apply_ha(user->ha, sin)   /* Access is permitted from this IP */
         && (ast_strlen_zero(iaxs[callno]->context) ||         /* No context specified */
              apply_context(user->contexts, iaxs[callno]->context))) {        /* Context is permitted */
         if (!ast_strlen_zero(iaxs[callno]->username)) {
            /* Exact match, stop right now. */
            if (best)
               user_unref(best);
            best = user;
            break;
         } else if (ast_strlen_zero(user->secret) && ast_strlen_zero(user->dbsecret) && ast_strlen_zero(user->inkeys)) {
            /* No required authentication */
            if (user->ha) {
               /* There was host authentication and we passed, bonus! */
               if (bestscore < 4) {
                  bestscore = 4;
                  if (best)
                     user_unref(best);
                  best = user;
                  continue;
               }
            } else {
               /* No host access, but no secret, either, not bad */
               if (bestscore < 3) {
                  bestscore = 3;
                  if (best)
                     user_unref(best);
                  best = user;
                  continue;
               }
            }
         } else {
            if (user->ha) {
               /* Authentication, but host access too, eh, it's something.. */
               if (bestscore < 2) {
                  bestscore = 2;
                  if (best)
                     user_unref(best);
                  best = user;
                  continue;
               }
            } else {
               /* Authentication and no host access...  This is our baseline */
               if (bestscore < 1) {
                  bestscore = 1;
                  if (best)
                     user_unref(best);
                  best = user;
                  continue;
               }
            }
         }
      }
      user_unref(user);
   }
   user = best;
   if (!user && !ast_strlen_zero(iaxs[callno]->username)) {
      user = realtime_user(iaxs[callno]->username, sin);
      if (user && !ast_strlen_zero(iaxs[callno]->context) &&         /* No context specified */
          !apply_context(user->contexts, iaxs[callno]->context)) {      /* Context is permitted */
         user = user_unref(user);
      }
   }
   if (user) {
      /* We found our match (use the first) */
      /* copy vars */
      for (v = user->vars ; v ; v = v->next) {
         if((tmpvar = ast_variable_new(v->name, v->value))) {
            tmpvar->next = iaxs[callno]->vars; 
            iaxs[callno]->vars = tmpvar;
         }
      }
      /* If a max AUTHREQ restriction is in place, activate it */
      if (user->maxauthreq > 0)
         ast_set_flag(iaxs[callno], IAX_MAXAUTHREQ);
      iaxs[callno]->prefs = user->prefs;
      ast_copy_flags(iaxs[callno], user, IAX_CODEC_USER_FIRST);
      ast_copy_flags(iaxs[callno], user, IAX_CODEC_NOPREFS);
      ast_copy_flags(iaxs[callno], user, IAX_CODEC_NOCAP);
      iaxs[callno]->encmethods = user->encmethods;
      /* Store the requested username if not specified */
      if (ast_strlen_zero(iaxs[callno]->username))
         ast_string_field_set(iaxs[callno], username, user->name);
      /* Store whether this is a trunked call, too, of course, and move if appropriate */
      ast_copy_flags(iaxs[callno], user, IAX_TRUNK);
      iaxs[callno]->capability = user->capability;
      /* And use the default context */
      if (ast_strlen_zero(iaxs[callno]->context)) {
         if (user->contexts)
            ast_string_field_set(iaxs[callno], context, user->contexts->context);
         else
            ast_string_field_set(iaxs[callno], context, context);
      }
      /* And any input keys */
      ast_string_field_set(iaxs[callno], inkeys, user->inkeys);
      /* And the permitted authentication methods */
      iaxs[callno]->authmethods = user->authmethods;
      iaxs[callno]->adsi = user->adsi;
      /* If they have callerid, override the given caller id.  Always store the ANI */
      if (!ast_strlen_zero(iaxs[callno]->cid_num) || !ast_strlen_zero(iaxs[callno]->cid_name)) {
         if (ast_test_flag(user, IAX_HASCALLERID)) {
            iaxs[callno]->calling_tns = 0;
            iaxs[callno]->calling_ton = 0;
            ast_string_field_set(iaxs[callno], cid_num, user->cid_num);
            ast_string_field_set(iaxs[callno], cid_name, user->cid_name);
            iaxs[callno]->calling_pres = AST_PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN;
         }
         if (ast_strlen_zero(iaxs[callno]->ani))
            ast_string_field_set(iaxs[callno], ani, user->cid_num);
      } else {
         iaxs[callno]->calling_pres = AST_PRES_NUMBER_NOT_AVAILABLE;
      }
      if (!ast_strlen_zero(user->accountcode))
         ast_string_field_set(iaxs[callno], accountcode, user->accountcode);
      if (!ast_strlen_zero(user->mohinterpret))
         ast_string_field_set(iaxs[callno], mohinterpret, user->mohinterpret);
      if (!ast_strlen_zero(user->mohsuggest))
         ast_string_field_set(iaxs[callno], mohsuggest, user->mohsuggest);
      if (user->amaflags)
         iaxs[callno]->amaflags = user->amaflags;
      if (!ast_strlen_zero(user->language))
         ast_string_field_set(iaxs[callno], language, user->language);
      ast_copy_flags(iaxs[callno], user, IAX_NOTRANSFER | IAX_TRANSFERMEDIA | IAX_USEJITTERBUF | IAX_FORCEJITTERBUF);   
      /* Keep this check last */
      if (!ast_strlen_zero(user->dbsecret)) {
         char *family, *key=NULL;
         char buf[80];
         family = ast_strdupa(user->dbsecret);
         key = strchr(family, '/');
         if (key) {
            *key = '\0';
            key++;
         }
         if (!key || ast_db_get(family, key, buf, sizeof(buf)))
            ast_log(LOG_WARNING, "Unable to retrieve database password for family/key '%s'!\n", user->dbsecret);
         else
            ast_string_field_set(iaxs[callno], secret, buf);
      } else
         ast_string_field_set(iaxs[callno], secret, user->secret);
      res = 0;
      user = user_unref(user);
   }
   ast_set2_flag(iaxs[callno], iax2_getpeertrunk(*sin), IAX_TRUNK);  
   return res;
}

static int raw_hangup(struct sockaddr_in *sin, unsigned short src, unsigned short dst, int sockfd)
{
   struct ast_iax2_full_hdr fh;
   fh.scallno = htons(src | IAX_FLAG_FULL);
   fh.dcallno = htons(dst);
   fh.ts = 0;
   fh.oseqno = 0;
   fh.iseqno = 0;
   fh.type = AST_FRAME_IAX;
   fh.csub = compress_subclass(IAX_COMMAND_INVAL);
   if (iaxdebug)
       iax_showframe(NULL, &fh, 0, sin, 0);
   if (option_debug)
      ast_log(LOG_DEBUG, "Raw Hangup %s:%d, src=%d, dst=%d\n",
         ast_inet_ntoa(sin->sin_addr), ntohs(sin->sin_port), src, dst);
   return sendto(sockfd, &fh, sizeof(fh), 0, (struct sockaddr *)sin, sizeof(*sin));
}

static void merge_encryption(struct chan_iax2_pvt *p, unsigned int enc)
{
   /* Select exactly one common encryption if there are any */
   p->encmethods &= enc;
   if (p->encmethods) {
      if (p->encmethods & IAX_ENCRYPT_AES128)
         p->encmethods = IAX_ENCRYPT_AES128;
      else
         p->encmethods = 0;
   }
}

/*!
 * \pre iaxsl[call_num] is locked
 *
 * \note Since this function calls send_command_final(), the pvt struct for the given
 *       call number may disappear while executing this function.
 */
static int authenticate_request(int call_num)
{
   struct iax_ie_data ied;
   int res = -1, authreq_restrict = 0;
   char challenge[10];
   struct chan_iax2_pvt *p = iaxs[call_num];

   memset(&ied, 0, sizeof(ied));

   /* If an AUTHREQ restriction is in place, make sure we can send an AUTHREQ back */
   if (ast_test_flag(p, IAX_MAXAUTHREQ)) {
      struct iax2_user *user, tmp_user = {
         .name = p->username, 
      };

      user = ao2_find(users, &tmp_user, OBJ_POINTER);
      if (user) {
         if (user->curauthreq == user->maxauthreq)
            authreq_restrict = 1;
         else
            user->curauthreq++;
         user = user_unref(user);
      }
   }

   /* If the AUTHREQ limit test failed, send back an error */
   if (authreq_restrict) {
      iax_ie_append_str(&ied, IAX_IE_CAUSE, "Unauthenticated call limit reached");
      iax_ie_append_byte(&ied, IAX_IE_CAUSECODE, AST_CAUSE_CALL_REJECTED);
      send_command_final(p, AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied.buf, ied.pos, -1);
      return 0;
   }

   iax_ie_append_short(&ied, IAX_IE_AUTHMETHODS, p->authmethods);
   if (p->authmethods & (IAX_AUTH_MD5 | IAX_AUTH_RSA)) {
      snprintf(challenge, sizeof(challenge), "%d", (int)ast_random());
      ast_string_field_set(p, challenge, challenge);
      /* snprintf(p->challenge, sizeof(p->challenge), "%d", (int)ast_random()); */
      iax_ie_append_str(&ied, IAX_IE_CHALLENGE, p->challenge);
   }
   if (p->encmethods)
      iax_ie_append_short(&ied, IAX_IE_ENCRYPTION, p->encmethods);

   iax_ie_append_str(&ied,IAX_IE_USERNAME, p->username);

   res = send_command(p, AST_FRAME_IAX, IAX_COMMAND_AUTHREQ, 0, ied.buf, ied.pos, -1);

   if (p->encmethods)
      ast_set_flag(p, IAX_ENCRYPTED);

   return res;
}

static int authenticate_verify(struct chan_iax2_pvt *p, struct iax_ies *ies)
{
   char requeststr[256];
   char md5secret[256] = "";
   char secret[256] = "";
   char rsasecret[256] = "";
   int res = -1; 
   int x;
   struct iax2_user *user, tmp_user = {
      .name = p->username, 
   };

   user = ao2_find(users, &tmp_user, OBJ_POINTER);
   if (user) {
      if (ast_test_flag(p, IAX_MAXAUTHREQ)) {
         ast_atomic_fetchadd_int(&user->curauthreq, -1);
         ast_clear_flag(p, IAX_MAXAUTHREQ);
      }
      ast_string_field_set(p, host, user->name);
      user = user_unref(user);
   }

   if (!ast_test_flag(&p->state, IAX_STATE_AUTHENTICATED))
      return res;
   if (ies->password)
      ast_copy_string(secret, ies->password, sizeof(secret));
   if (ies->md5_result)
      ast_copy_string(md5secret, ies->md5_result, sizeof(md5secret));
   if (ies->rsa_result)
      ast_copy_string(rsasecret, ies->rsa_result, sizeof(rsasecret));
   if ((p->authmethods & IAX_AUTH_RSA) && !ast_strlen_zero(rsasecret) && !ast_strlen_zero(p->inkeys)) {
      struct ast_key *key;
      char *keyn;
      char tmpkey[256];
      char *stringp=NULL;
      ast_copy_string(tmpkey, p->inkeys, sizeof(tmpkey));
      stringp=tmpkey;
      keyn = strsep(&stringp, ":");
      while(keyn) {
         key = ast_key_get(keyn, AST_KEY_PUBLIC);
         if (key && !ast_check_signature(key, p->challenge, rsasecret)) {
            res = 0;
            break;
         } else if (!key)
            ast_log(LOG_WARNING, "requested inkey '%s' for RSA authentication does not exist\n", keyn);
         keyn = strsep(&stringp, ":");
      }
   } else if (p->authmethods & IAX_AUTH_MD5) {
      struct MD5Context md5;
      unsigned char digest[16];
      char *tmppw, *stringp;
      
      tmppw = ast_strdupa(p->secret);
      stringp = tmppw;
      while((tmppw = strsep(&stringp, ";"))) {
         MD5Init(&md5);
         MD5Update(&md5, (unsigned char *)p->challenge, strlen(p->challenge));
         MD5Update(&md5, (unsigned char *)tmppw, strlen(tmppw));
         MD5Final(digest, &md5);
         /* If they support md5, authenticate with it.  */
         for (x=0;x<16;x++)
            sprintf(requeststr + (x << 1), "%2.2x", digest[x]); /* safe */
         if (!strcasecmp(requeststr, md5secret)) {
            res = 0;
            break;
         }
      }
   } else if (p->authmethods & IAX_AUTH_PLAINTEXT) {
      if (!strcmp(secret, p->secret))
         res = 0;
   }
   return res;
}

/*! \brief Verify inbound registration */
static int register_verify(int callno, struct sockaddr_in *sin, struct iax_ies *ies)
{
   char requeststr[256] = "";
   char peer[256] = "";
   char md5secret[256] = "";
   char rsasecret[256] = "";
   char secret[256] = "";
   struct iax2_peer *p = NULL;
   struct ast_key *key;
   char *keyn;
   int x;
   int expire = 0;
   int res = -1;

   ast_clear_flag(&iaxs[callno]->state, IAX_STATE_AUTHENTICATED | IAX_STATE_UNCHANGED);
   /* iaxs[callno]->peer[0] = '\0'; not necc. any more-- stringfield is pre-inited to null string */
   if (ies->username)
      ast_copy_string(peer, ies->username, sizeof(peer));
   if (ies->password)
      ast_copy_string(secret, ies->password, sizeof(secret));
   if (ies->md5_result)
      ast_copy_string(md5secret, ies->md5_result, sizeof(md5secret));
   if (ies->rsa_result)
      ast_copy_string(rsasecret, ies->rsa_result, sizeof(rsasecret));
   if (ies->refresh)
      expire = ies->refresh;

   if (ast_strlen_zero(peer)) {
      ast_log(LOG_NOTICE, "Empty registration from %s\n", ast_inet_ntoa(sin->sin_addr));
      return -1;
   }

   /* SLD: first call to lookup peer during registration */
   ast_mutex_unlock(&iaxsl[callno]);
   p = find_peer(peer, 1);
   ast_mutex_lock(&iaxsl[callno]);
   if (!p || !iaxs[callno]) {
      if (authdebug && !p)
         ast_log(LOG_NOTICE, "No registration for peer '%s' (from %s)\n", peer, ast_inet_ntoa(sin->sin_addr));
      goto return_unref;
   }

   if (!ast_test_flag(p, IAX_DYNAMIC)) {
      if (authdebug)
         ast_log(LOG_NOTICE, "Peer '%s' is not dynamic (from %s)\n", peer, ast_inet_ntoa(sin->sin_addr));
      goto return_unref;
   }

   if (!ast_apply_ha(p->ha, sin)) {
      if (authdebug)
         ast_log(LOG_NOTICE, "Host %s denied access to register peer '%s'\n", ast_inet_ntoa(sin->sin_addr), p->name);
      goto return_unref;
   }
   if (!inaddrcmp(&p->addr, sin))
      ast_set_flag(&iaxs[callno]->state, IAX_STATE_UNCHANGED);
   ast_string_field_set(iaxs[callno], secret, p->secret);
   ast_string_field_set(iaxs[callno], inkeys, p->inkeys);
   /* Check secret against what we have on file */
   if (!ast_strlen_zero(rsasecret) && (p->authmethods & IAX_AUTH_RSA) && !ast_strlen_zero(iaxs[callno]->challenge)) {
      if (!ast_strlen_zero(p->inkeys)) {
         char tmpkeys[256];
         char *stringp=NULL;
         ast_copy_string(tmpkeys, p->inkeys, sizeof(tmpkeys));
         stringp=tmpkeys;
         keyn = strsep(&stringp, ":");
         while(keyn) {
            key = ast_key_get(keyn, AST_KEY_PUBLIC);
            if (key && !ast_check_signature(key, iaxs[callno]->challenge, rsasecret)) {
               ast_set_flag(&iaxs[callno]->state, IAX_STATE_AUTHENTICATED);
               break;
            } else if (!key) 
               ast_log(LOG_WARNING, "requested inkey '%s' does not exist\n", keyn);
            keyn = strsep(&stringp, ":");
         }
         if (!keyn) {
            if (authdebug)
               ast_log(LOG_NOTICE, "Host %s failed RSA authentication with inkeys '%s'\n", peer, p->inkeys);
            goto return_unref;
         }
      } else {
         if (authdebug)
            ast_log(LOG_NOTICE, "Host '%s' trying to do RSA authentication, but we have no inkeys\n", peer);
         goto return_unref;
      }
   } else if (!ast_strlen_zero(md5secret) && (p->authmethods & IAX_AUTH_MD5) && !ast_strlen_zero(iaxs[callno]->challenge)) {
      struct MD5Context md5;
      unsigned char digest[16];
      char *tmppw, *stringp;
      
      tmppw = ast_strdupa(p->secret);
      stringp = tmppw;
      while((tmppw = strsep(&stringp, ";"))) {
         MD5Init(&md5);
         MD5Update(&md5, (unsigned char *)iaxs[callno]->challenge, strlen(iaxs[callno]->challenge));
         MD5Update(&md5, (unsigned char *)tmppw, strlen(tmppw));
         MD5Final(digest, &md5);
         for (x=0;x<16;x++)
            sprintf(requeststr + (x << 1), "%2.2x", digest[x]); /* safe */
         if (!strcasecmp(requeststr, md5secret)) 
            break;
      }
      if (tmppw) {
         ast_set_flag(&iaxs[callno]->state, IAX_STATE_AUTHENTICATED);
      } else {
         if (authdebug)
            ast_log(LOG_NOTICE, "Host %s failed MD5 authentication for '%s' (%s != %s)\n", ast_inet_ntoa(sin->sin_addr), p->name, requeststr, md5secret);
         goto return_unref;
      }
   } else if (!ast_strlen_zero(secret) && (p->authmethods & IAX_AUTH_PLAINTEXT)) {
      /* They've provided a plain text password and we support that */
      if (strcmp(secret, p->secret)) {
         if (authdebug)
            ast_log(LOG_NOTICE, "Host %s did not provide proper plaintext password for '%s'\n", ast_inet_ntoa(sin->sin_addr), p->name);
         goto return_unref;
      } else
         ast_set_flag(&iaxs[callno]->state, IAX_STATE_AUTHENTICATED);
   } else if (!ast_strlen_zero(md5secret) || !ast_strlen_zero(secret)) {
      if (authdebug)
         ast_log(LOG_NOTICE, "Inappropriate authentication received\n");
      goto return_unref;
   }
   ast_string_field_set(iaxs[callno], peer, peer);
   /* Choose lowest expiry number */
   if (expire && (expire < iaxs[callno]->expiry)) 
      iaxs[callno]->expiry = expire;

   ast_device_state_changed("IAX2/%s", p->name); /* Activate notification */

   res = 0;

return_unref:
   if (p)
      peer_unref(p);

   return res;
}

static int authenticate(const char *challenge, const char *secret, const char *keyn, int authmethods, struct iax_ie_data *ied, struct sockaddr_in *sin, struct chan_iax2_pvt *pvt)
{
   int res = -1;
   int x;
   if (!ast_strlen_zero(keyn)) {
      if (!(authmethods & IAX_AUTH_RSA)) {
         if (ast_strlen_zero(secret)) 
            ast_log(LOG_NOTICE, "Asked to authenticate to %s with an RSA key, but they don't allow RSA authentication\n", ast_inet_ntoa(sin->sin_addr));
      } else if (ast_strlen_zero(challenge)) {
         ast_log(LOG_NOTICE, "No challenge provided for RSA authentication to %s\n", ast_inet_ntoa(sin->sin_addr));
      } else {
         char sig[256];
         struct ast_key *key;
         key = ast_key_get(keyn, AST_KEY_PRIVATE);
         if (!key) {
            ast_log(LOG_NOTICE, "Unable to find private key '%s'\n", keyn);
         } else {
            if (ast_sign(key, (char*)challenge, sig)) {
               ast_log(LOG_NOTICE, "Unable to sign challenge with key\n");
               res = -1;
            } else {
               iax_ie_append_str(ied, IAX_IE_RSA_RESULT, sig);
               res = 0;
            }
         }
      }
   } 
   /* Fall back */
   if (res && !ast_strlen_zero(secret)) {
      if ((authmethods & IAX_AUTH_MD5) && !ast_strlen_zero(challenge)) {
         struct MD5Context md5;
         unsigned char digest[16];
         char digres[128];
         MD5Init(&md5);
         MD5Update(&md5, (unsigned char *)challenge, strlen(challenge));
         MD5Update(&md5, (unsigned char *)secret, strlen(secret));
         MD5Final(digest, &md5);
         /* If they support md5, authenticate with it.  */
         for (x=0;x<16;x++)
            sprintf(digres + (x << 1),  "%2.2x", digest[x]); /* safe */
         if (pvt) {
            build_encryption_keys(digest, pvt);
         }
         iax_ie_append_str(ied, IAX_IE_MD5_RESULT, digres);
         res = 0;
      } else if (authmethods & IAX_AUTH_PLAINTEXT) {
         iax_ie_append_str(ied, IAX_IE_PASSWORD, secret);
         res = 0;
      } else
         ast_log(LOG_NOTICE, "No way to send secret to peer '%s' (their methods: %d)\n", ast_inet_ntoa(sin->sin_addr), authmethods);
   }
   return res;
}

/*!
 * \note This function calls realtime_peer -> reg_source_db -> iax2_poke_peer -> find_callno,
 *       so do not call this function with a pvt lock held.
 */
static int authenticate_reply(struct chan_iax2_pvt *p, struct sockaddr_in *sin, struct iax_ies *ies, const char *override, const char *okey)
{
   struct iax2_peer *peer = NULL;
   /* Start pessimistic */
   int res = -1;
   int authmethods = 0;
   struct iax_ie_data ied;
   uint16_t callno = p->callno;

   memset(&ied, 0, sizeof(ied));
   
   if (ies->username)
      ast_string_field_set(p, username, ies->username);
   if (ies->challenge)
      ast_string_field_set(p, challenge, ies->challenge);
   if (ies->authmethods)
      authmethods = ies->authmethods;
   if (authmethods & IAX_AUTH_MD5)
      merge_encryption(p, ies->encmethods);
   else
      p->encmethods = 0;

   /* Check for override RSA authentication first */
   if (!ast_strlen_zero(override) || !ast_strlen_zero(okey)) {
      /* Normal password authentication */
      res = authenticate(p->challenge, override, okey, authmethods, &ied, sin, p);
   } else {
      struct ao2_iterator i = ao2_iterator_init(peers, 0);
      while ((peer = ao2_iterator_next(&i))) {
         if ((ast_strlen_zero(p->peer) || !strcmp(p->peer, peer->name)) 
             /* No peer specified at our end, or this is the peer */
             && (ast_strlen_zero(peer->username) || (!strcmp(peer->username, p->username)))
             /* No username specified in peer rule, or this is the right username */
             && (!peer->addr.sin_addr.s_addr || ((sin->sin_addr.s_addr & peer->mask.s_addr) == (peer->addr.sin_addr.s_addr & peer->mask.s_addr)))
             /* No specified host, or this is our host */
            ) {
            res = authenticate(p->challenge, peer->secret, peer->outkey, authmethods, &ied, sin, p);
            if (!res) {
               peer_unref(peer);
               break;
            }
         }
         peer_unref(peer);
      }
      if (!peer) {
         /* We checked our list and didn't find one.  It's unlikely, but possible, 
            that we're trying to authenticate *to* a realtime peer */
         const char *peer_name = ast_strdupa(p->peer);
         ast_mutex_unlock(&iaxsl[callno]);
         if ((peer = realtime_peer(peer_name, NULL))) {
            ast_mutex_lock(&iaxsl[callno]);
            if (!(p = iaxs[callno])) {
               peer_unref(peer);
               return -1;
            }
            res = authenticate(p->challenge, peer->secret,peer->outkey, authmethods, &ied, sin, p);
            peer_unref(peer);
         }
         if (!peer) {
            ast_mutex_lock(&iaxsl[callno]);
            if (!(p = iaxs[callno]))
               return -1;
         }
      }
   }
   if (ies->encmethods)
      ast_set_flag(p, IAX_ENCRYPTED | IAX_KEYPOPULATED);
   if (!res)
      res = send_command(p, AST_FRAME_IAX, IAX_COMMAND_AUTHREP, 0, ied.buf, ied.pos, -1);
   return res;
}

static int iax2_do_register(struct iax2_registry *reg);

static void __iax2_do_register_s(const void *data)
{
   struct iax2_registry *reg = (struct iax2_registry *)data;
   reg->expire = -1;
   iax2_do_register(reg);
}

static int iax2_do_register_s(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__iax2_do_register_s, data))
#endif      
      __iax2_do_register_s(data);
   return 0;
}

static int try_transfer(struct chan_iax2_pvt *pvt, struct iax_ies *ies)
{
   int newcall = 0;
   char newip[256];
   struct iax_ie_data ied;
   struct sockaddr_in new;
   
   
   memset(&ied, 0, sizeof(ied));
   if (ies->apparent_addr)
      bcopy(ies->apparent_addr, &new, sizeof(new));
   if (ies->callno)
      newcall = ies->callno;
   if (!newcall || !new.sin_addr.s_addr || !new.sin_port) {
      ast_log(LOG_WARNING, "Invalid transfer request\n");
      return -1;
   }
   pvt->transfercallno = newcall;
   memcpy(&pvt->transfer, &new, sizeof(pvt->transfer));
   inet_aton(newip, &pvt->transfer.sin_addr);
   pvt->transfer.sin_family = AF_INET;
   pvt->transferring = TRANSFER_BEGIN;
   pvt->transferid = ies->transferid;
   if (ies->transferid)
      iax_ie_append_int(&ied, IAX_IE_TRANSFERID, ies->transferid);
   send_command_transfer(pvt, AST_FRAME_IAX, IAX_COMMAND_TXCNT, 0, ied.buf, ied.pos);
   return 0; 
}

static int complete_dpreply(struct chan_iax2_pvt *pvt, struct iax_ies *ies)
{
   char exten[256] = "";
   int status = CACHE_FLAG_UNKNOWN;
   int expiry = iaxdefaultdpcache;
   int x;
   int matchmore = 0;
   struct iax2_dpcache *dp, *prev;
   
   if (ies->called_number)
      ast_copy_string(exten, ies->called_number, sizeof(exten));

   if (ies->dpstatus & IAX_DPSTATUS_EXISTS)
      status = CACHE_FLAG_EXISTS;
   else if (ies->dpstatus & IAX_DPSTATUS_CANEXIST)
      status = CACHE_FLAG_CANEXIST;
   else if (ies->dpstatus & IAX_DPSTATUS_NONEXISTENT)
      status = CACHE_FLAG_NONEXISTENT;

   if (ies->dpstatus & IAX_DPSTATUS_IGNOREPAT) {
      /* Don't really do anything with this */
   }
   if (ies->refresh)
      expiry = ies->refresh;
   if (ies->dpstatus & IAX_DPSTATUS_MATCHMORE)
      matchmore = CACHE_FLAG_MATCHMORE;
   ast_mutex_lock(&dpcache_lock);
   prev = NULL;
   dp = pvt->dpentries;
   while(dp) {
      if (!strcmp(dp->exten, exten)) {
         /* Let them go */
         if (prev)
            prev->peer = dp->peer;
         else
            pvt->dpentries = dp->peer;
         dp->peer = NULL;
         dp->callno = 0;
         dp->expiry.tv_sec = dp->orig.tv_sec + expiry;
         if (dp->flags & CACHE_FLAG_PENDING) {
            dp->flags &= ~CACHE_FLAG_PENDING;
            dp->flags |= status;
            dp->flags |= matchmore;
         }
         /* Wake up waiters */
         for (x=0;x<sizeof(dp->waiters) / sizeof(dp->waiters[0]); x++)
            if (dp->waiters[x] > -1)
               write(dp->waiters[x], "asdf", 4);
      }
      prev = dp;
      dp = dp->peer;
   }
   ast_mutex_unlock(&dpcache_lock);
   return 0;
}

static int complete_transfer(int callno, struct iax_ies *ies)
{
   int peercallno = 0;
   struct chan_iax2_pvt *pvt = iaxs[callno];
   struct iax_frame *cur;
   jb_frame frame;

   if (ies->callno)
      peercallno = ies->callno;

   if (peercallno < 1) {
      ast_log(LOG_WARNING, "Invalid transfer request\n");
      return -1;
   }
   memcpy(&pvt->addr, &pvt->transfer, sizeof(pvt->addr));
   memset(&pvt->transfer, 0, sizeof(pvt->transfer));
   /* Reset sequence numbers */
   pvt->oseqno = 0;
   pvt->rseqno = 0;
   pvt->iseqno = 0;
   pvt->aseqno = 0;

   if (pvt->peercallno) {
      remove_by_peercallno(pvt);
   }
   pvt->peercallno = peercallno;
   store_by_peercallno(pvt);

   pvt->transferring = TRANSFER_NONE;
   pvt->svoiceformat = -1;
   pvt->voiceformat = 0;
   pvt->svideoformat = -1;
   pvt->videoformat = 0;
   pvt->transfercallno = -1;
   memset(&pvt->rxcore, 0, sizeof(pvt->rxcore));
   memset(&pvt->offset, 0, sizeof(pvt->offset));
   /* reset jitterbuffer */
   while(jb_getall(pvt->jb,&frame) == JB_OK)
      iax2_frame_free(frame.data);
   jb_reset(pvt->jb);
   pvt->lag = 0;
   pvt->last = 0;
   pvt->lastsent = 0;
   pvt->nextpred = 0;
   pvt->pingtime = DEFAULT_RETRY_TIME;
   AST_LIST_LOCK(&iaxq.queue);
   AST_LIST_TRAVERSE(&iaxq.queue, cur, list) {
      /* We must cancel any packets that would have been transmitted
         because now we're talking to someone new.  It's okay, they
         were transmitted to someone that didn't care anyway. */
      if (callno == cur->callno) 
         cur->retries = -1;
   }
   AST_LIST_UNLOCK(&iaxq.queue);
   return 0; 
}

/*! \brief Acknowledgment received for OUR registration */
static int iax2_ack_registry(struct iax_ies *ies, struct sockaddr_in *sin, int callno)
{
   struct iax2_registry *reg;
   /* Start pessimistic */
   char peer[256] = "";
   char msgstatus[60];
   int refresh = 60;
   char ourip[256] = "<Unspecified>";
   struct sockaddr_in oldus;
   struct sockaddr_in us;
   int oldmsgs;

   memset(&us, 0, sizeof(us));
   if (ies->apparent_addr)
      bcopy(ies->apparent_addr, &us, sizeof(us));
   if (ies->username)
      ast_copy_string(peer, ies->username, sizeof(peer));
   if (ies->refresh)
      refresh = ies->refresh;
   if (ies->calling_number) {
      /* We don't do anything with it really, but maybe we should */
   }
   reg = iaxs[callno]->reg;
   if (!reg) {
      ast_log(LOG_WARNING, "Registry acknowledge on unknown registry '%s'\n", peer);
      return -1;
   }
   memcpy(&oldus, &reg->us, sizeof(oldus));
   oldmsgs = reg->messages;
   if (inaddrcmp(&reg->addr, sin)) {
      ast_log(LOG_WARNING, "Received unsolicited registry ack from '%s'\n", ast_inet_ntoa(sin->sin_addr));
      return -1;
   }
   memcpy(&reg->us, &us, sizeof(reg->us));
   if (ies->msgcount >= 0)
      reg->messages = ies->msgcount & 0xffff;      /* only low 16 bits are used in the transmission of the IE */
   /* always refresh the registration at the interval requested by the server
      we are registering to
   */
   reg->refresh = refresh;
   AST_SCHED_DEL(sched, reg->expire);
   reg->expire = iax2_sched_add(sched, (5 * reg->refresh / 6) * 1000, iax2_do_register_s, reg);
   if (inaddrcmp(&oldus, &reg->us) || (reg->messages != oldmsgs)) {
      if (option_verbose > 2) {
         if (reg->messages > 255)
            snprintf(msgstatus, sizeof(msgstatus), " with %d new and %d old messages waiting", reg->messages & 0xff, reg->messages >> 8);
         else if (reg->messages > 1)
            snprintf(msgstatus, sizeof(msgstatus), " with %d new messages waiting\n", reg->messages);
         else if (reg->messages > 0)
            snprintf(msgstatus, sizeof(msgstatus), " with 1 new message waiting\n");
         else
            snprintf(msgstatus, sizeof(msgstatus), " with no messages waiting\n");
         snprintf(ourip, sizeof(ourip), "%s:%d", ast_inet_ntoa(reg->us.sin_addr), ntohs(reg->us.sin_port));
         ast_verbose(VERBOSE_PREFIX_3 "Registered IAX2 to '%s', who sees us as %s%s\n", ast_inet_ntoa(sin->sin_addr), ourip, msgstatus);
      }
      manager_event(EVENT_FLAG_SYSTEM, "Registry", "ChannelDriver: IAX2\r\nDomain: %s\r\nStatus: Registered\r\n", ast_inet_ntoa(sin->sin_addr));
   }
   reg->regstate = REG_STATE_REGISTERED;
   return 0;
}

static int iax2_register(char *value, int lineno)
{
   struct iax2_registry *reg;
   char copy[256];
   char *username, *hostname, *secret;
   char *porta;
   char *stringp=NULL;
   
   if (!value)
      return -1;
   ast_copy_string(copy, value, sizeof(copy));
   stringp=copy;
   username = strsep(&stringp, "@");
   hostname = strsep(&stringp, "@");
   if (!hostname) {
      ast_log(LOG_WARNING, "Format for registration is user[:secret]@host[:port] at line %d\n", lineno);
      return -1;
   }
   stringp=username;
   username = strsep(&stringp, ":");
   secret = strsep(&stringp, ":");
   stringp=hostname;
   hostname = strsep(&stringp, ":");
   porta = strsep(&stringp, ":");
   
   if (porta && !atoi(porta)) {
      ast_log(LOG_WARNING, "%s is not a valid port number at line %d\n", porta, lineno);
      return -1;
   }
   if (!(reg = ast_calloc(1, sizeof(*reg))))
      return -1;
   if (ast_dnsmgr_lookup(hostname, &reg->addr.sin_addr, &reg->dnsmgr) < 0) {
      free(reg);
      return -1;
   }
   ast_copy_string(reg->username, username, sizeof(reg->username));
   if (secret)
      ast_copy_string(reg->secret, secret, sizeof(reg->secret));
   reg->expire = -1;
   reg->refresh = IAX_DEFAULT_REG_EXPIRE;
   reg->addr.sin_family = AF_INET;
   reg->addr.sin_port = porta ? htons(atoi(porta)) : htons(IAX_DEFAULT_PORTNO);
   AST_LIST_LOCK(&registrations);
   AST_LIST_INSERT_HEAD(&registrations, reg, entry);
   AST_LIST_UNLOCK(&registrations);
   
   return 0;
}

static void register_peer_exten(struct iax2_peer *peer, int onoff)
{
   char multi[256];
   char *stringp, *ext;
   if (!ast_strlen_zero(regcontext)) {
      ast_copy_string(multi, S_OR(peer->regexten, peer->name), sizeof(multi));
      stringp = multi;
      while((ext = strsep(&stringp, "&"))) {
         if (onoff) {
            if (!ast_exists_extension(NULL, regcontext, ext, 1, NULL))
               ast_add_extension(regcontext, 1, ext, 1, NULL, NULL,
                       "Noop", ast_strdup(peer->name), ast_free, "IAX2");
         } else
            ast_context_remove_extension(regcontext, ext, 1, NULL);
      }
   }
}
static void prune_peers(void);

static void unlink_peer(struct iax2_peer *peer)
{
   if (peer->expire > -1) {
      if (!ast_sched_del(sched, peer->expire)) {
         peer->expire = -1;
         peer_unref(peer);
      }
   }

   if (peer->pokeexpire > -1) {
      if (!ast_sched_del(sched, peer->pokeexpire)) {
         peer->pokeexpire = -1;
         peer_unref(peer);
      }
   }

   ao2_unlink(peers, peer);
}

static void __expire_registry(const void *data)
{
   struct iax2_peer *peer = (struct iax2_peer *) data;

   if (!peer)
      return;

   peer->expire = -1;

   if (option_debug)
      ast_log(LOG_DEBUG, "Expiring registration for peer '%s'\n", peer->name);
   if (ast_test_flag((&globalflags), IAX_RTUPDATE) && (ast_test_flag(peer, IAX_TEMPONLY|IAX_RTCACHEFRIENDS)))
      realtime_update_peer(peer->name, &peer->addr, 0);
   manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Unregistered\r\nCause: Expired\r\n", peer->name);
   /* Reset the address */
   memset(&peer->addr, 0, sizeof(peer->addr));
   /* Reset expiry value */
   peer->expiry = min_reg_expire;
   if (!ast_test_flag(peer, IAX_TEMPONLY))
      ast_db_del("IAX/Registry", peer->name);
   register_peer_exten(peer, 0);
   ast_device_state_changed("IAX2/%s", peer->name); /* Activate notification */
   if (iax2_regfunk)
      iax2_regfunk(peer->name, 0);

   if (ast_test_flag(peer, IAX_RTAUTOCLEAR))
      unlink_peer(peer);

   peer_unref(peer);
}

static int expire_registry(const void *data)
{
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__expire_registry, data))
#endif      
      __expire_registry(data);
   return 0;
}

static int iax2_poke_peer(struct iax2_peer *peer, int heldcall);

static void reg_source_db(struct iax2_peer *p)
{
   char data[80];
   struct in_addr in;
   char *c, *d;
   if (!ast_test_flag(p, IAX_TEMPONLY) && (!ast_db_get("IAX/Registry", p->name, data, sizeof(data)))) {
      c = strchr(data, ':');
      if (c) {
         *c = '\0';
         c++;
         if (inet_aton(data, &in)) {
            d = strchr(c, ':');
            if (d) {
               *d = '\0';
               d++;
               if (option_verbose > 2)
                  ast_verbose(VERBOSE_PREFIX_3 "Seeding '%s' at %s:%d for %d\n", p->name, 
                  ast_inet_ntoa(in), atoi(c), atoi(d));
               iax2_poke_peer(p, 0);
               p->expiry = atoi(d);
               memset(&p->addr, 0, sizeof(p->addr));
               p->addr.sin_family = AF_INET;
               p->addr.sin_addr = in;
               p->addr.sin_port = htons(atoi(c));
               if (p->expire > -1) {
                  if (!ast_sched_del(sched, p->expire)) {
                     p->expire = -1;
                     peer_unref(p);
                  }
               }
               ast_device_state_changed("IAX2/%s", p->name); /* Activate notification */
               p->expire = iax2_sched_add(sched, (p->expiry + 10) * 1000, expire_registry, peer_ref(p));
               if (p->expire == -1)
                  peer_unref(p);
               if (iax2_regfunk)
                  iax2_regfunk(p->name, 1);
               register_peer_exten(p, 1);
            }              
               
         }
      }
   }
}

/*!
 * \pre iaxsl[callno] is locked
 *
 * \note Since this function calls send_command_final(), the pvt struct for
 *       the given call number may disappear while executing this function.
 */
static int update_registry(struct sockaddr_in *sin, int callno, char *devtype, int fd, unsigned short refresh)
{
   /* Called from IAX thread only, with proper iaxsl lock */
   struct iax_ie_data ied;
   struct iax2_peer *p;
   int msgcount;
   char data[80];
   int version;
   const char *peer_name;
   int res = -1;

   memset(&ied, 0, sizeof(ied));

   peer_name = ast_strdupa(iaxs[callno]->peer);

   /* SLD: Another find_peer call during registration - this time when we are really updating our registration */
   ast_mutex_unlock(&iaxsl[callno]);
   if (!(p = find_peer(peer_name, 1))) {
      ast_mutex_lock(&iaxsl[callno]);
      ast_log(LOG_WARNING, "No such peer '%s'\n", peer_name);
      return -1;
   }
   ast_mutex_lock(&iaxsl[callno]);
   if (!iaxs[callno])
      goto return_unref;

   if (ast_test_flag((&globalflags), IAX_RTUPDATE) && (ast_test_flag(p, IAX_TEMPONLY|IAX_RTCACHEFRIENDS))) {
      if (sin->sin_addr.s_addr) {
         time_t nowtime;
         time(&nowtime);
         realtime_update_peer(peer_name, sin, nowtime);
      } else {
         realtime_update_peer(peer_name, sin, 0);
      }
   }
   if (inaddrcmp(&p->addr, sin)) {
      if (iax2_regfunk)
         iax2_regfunk(p->name, 1);
      /* Stash the IP address from which they registered */
      memcpy(&p->addr, sin, sizeof(p->addr));
      snprintf(data, sizeof(data), "%s:%d:%d", ast_inet_ntoa(sin->sin_addr), ntohs(sin->sin_port), p->expiry);
      if (!ast_test_flag(p, IAX_TEMPONLY) && sin->sin_addr.s_addr) {
         ast_db_put("IAX/Registry", p->name, data);
         if  (option_verbose > 2)
            ast_verbose(VERBOSE_PREFIX_3 "Registered IAX2 '%s' (%s) at %s:%d\n", p->name, 
                   ast_test_flag(&iaxs[callno]->state, IAX_STATE_AUTHENTICATED) ? "AUTHENTICATED" : "UNAUTHENTICATED", ast_inet_ntoa(sin->sin_addr), ntohs(sin->sin_port));
         manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Registered\r\n", p->name);
         register_peer_exten(p, 1);
         ast_device_state_changed("IAX2/%s", p->name); /* Activate notification */
      } else if (!ast_test_flag(p, IAX_TEMPONLY)) {
         if  (option_verbose > 2)
            ast_verbose(VERBOSE_PREFIX_3 "Unregistered IAX2 '%s' (%s)\n", p->name, 
                   ast_test_flag(&iaxs[callno]->state, IAX_STATE_AUTHENTICATED) ? "AUTHENTICATED" : "UNAUTHENTICATED");
         manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Unregistered\r\n", p->name);
         register_peer_exten(p, 0);
         ast_db_del("IAX/Registry", p->name);
         ast_device_state_changed("IAX2/%s", p->name); /* Activate notification */
      }
      /* Update the host */
      /* Verify that the host is really there */
      iax2_poke_peer(p, callno);
   }     

   /* Make sure our call still exists, an INVAL at the right point may make it go away */
   if (!iaxs[callno]) {
      res = 0;
      goto return_unref;
   }

   /* Store socket fd */
   p->sockfd = fd;
   /* Setup the expiry */
   if (p->expire > -1) {
      if (!ast_sched_del(sched, p->expire)) {
         p->expire = -1;
         peer_unref(p);
      }
   }
   /* treat an unspecified refresh interval as the minimum */
   if (!refresh)
      refresh = min_reg_expire;
   if (refresh > max_reg_expire) {
      ast_log(LOG_NOTICE, "Restricting registration for peer '%s' to %d seconds (requested %d)\n",
         p->name, max_reg_expire, refresh);
      p->expiry = max_reg_expire;
   } else if (refresh < min_reg_expire) {
      ast_log(LOG_NOTICE, "Restricting registration for peer '%s' to %d seconds (requested %d)\n",
         p->name, min_reg_expire, refresh);
      p->expiry = min_reg_expire;
   } else {
      p->expiry = refresh;
   }
   if (p->expiry && sin->sin_addr.s_addr) {
      p->expire = iax2_sched_add(sched, (p->expiry + 10) * 1000, expire_registry, peer_ref(p));
      if (p->expire == -1)
         peer_unref(p);
   }
   iax_ie_append_str(&ied, IAX_IE_USERNAME, p->name);
   iax_ie_append_int(&ied, IAX_IE_DATETIME, iax2_datetime(p->zonetag));
   if (sin->sin_addr.s_addr) {
      iax_ie_append_short(&ied, IAX_IE_REFRESH, p->expiry);
      iax_ie_append_addr(&ied, IAX_IE_APPARENT_ADDR, &p->addr);
      if (!ast_strlen_zero(p->mailbox)) {
         int new, old;
         ast_app_inboxcount(p->mailbox, &new, &old);
         if (new > 255)
            new = 255;
         if (old > 255)
            old = 255;
         msgcount = (old << 8) | new;
         iax_ie_append_short(&ied, IAX_IE_MSGCOUNT, msgcount);
      }
      if (ast_test_flag(p, IAX_HASCALLERID)) {
         iax_ie_append_str(&ied, IAX_IE_CALLING_NUMBER, p->cid_num);
         iax_ie_append_str(&ied, IAX_IE_CALLING_NAME, p->cid_name);
      }
   }
   version = iax_check_version(devtype);
   if (version) 
      iax_ie_append_short(&ied, IAX_IE_FIRMWAREVER, version);

   res = 0;

return_unref:
   peer_unref(p);

   return res ? res : send_command_final(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_REGACK, 0, ied.buf, ied.pos, -1);
}

static int registry_authrequest(int callno)
{
   struct iax_ie_data ied;
   struct iax2_peer *p;
   char challenge[10];
   const char *peer_name;
   int res = -1;

   peer_name = ast_strdupa(iaxs[callno]->peer);

   /* SLD: third call to find_peer in registration */
   ast_mutex_unlock(&iaxsl[callno]);
   p = find_peer(peer_name, 1);
   ast_mutex_lock(&iaxsl[callno]);
   if (!iaxs[callno])
      goto return_unref;
   if (!p) {
      ast_log(LOG_WARNING, "No such peer '%s'\n", peer_name);
      goto return_unref;
   }
   
   memset(&ied, 0, sizeof(ied));
   iax_ie_append_short(&ied, IAX_IE_AUTHMETHODS, p->authmethods);
   if (p->authmethods & (IAX_AUTH_RSA | IAX_AUTH_MD5)) {
      /* Build the challenge */
      snprintf(challenge, sizeof(challenge), "%d", (int)ast_random());
      ast_string_field_set(iaxs[callno], challenge, challenge);
      iax_ie_append_str(&ied, IAX_IE_CHALLENGE, iaxs[callno]->challenge);
   }
   iax_ie_append_str(&ied, IAX_IE_USERNAME, peer_name);

   res = 0;

return_unref:
   peer_unref(p);

   return res ? res : send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_REGAUTH, 0, ied.buf, ied.pos, -1);;
}

static int registry_rerequest(struct iax_ies *ies, int callno, struct sockaddr_in *sin)
{
   struct iax2_registry *reg;
   /* Start pessimistic */
   struct iax_ie_data ied;
   char peer[256] = "";
   char challenge[256] = "";
   int res;
   int authmethods = 0;
   if (ies->authmethods)
      authmethods = ies->authmethods;
   if (ies->username)
      ast_copy_string(peer, ies->username, sizeof(peer));
   if (ies->challenge)
      ast_copy_string(challenge, ies->challenge, sizeof(challenge));
   memset(&ied, 0, sizeof(ied));
   reg = iaxs[callno]->reg;
   if (reg) {
         if (inaddrcmp(&reg->addr, sin)) {
            ast_log(LOG_WARNING, "Received unsolicited registry authenticate request from '%s'\n", ast_inet_ntoa(sin->sin_addr));
            return -1;
         }
         if (ast_strlen_zero(reg->secret)) {
            ast_log(LOG_NOTICE, "No secret associated with peer '%s'\n", reg->username);
            reg->regstate = REG_STATE_NOAUTH;
            return -1;
         }
         iax_ie_append_str(&ied, IAX_IE_USERNAME, reg->username);
         iax_ie_append_short(&ied, IAX_IE_REFRESH, reg->refresh);
         if (reg->secret[0] == '[') {
            char tmpkey[256];
            ast_copy_string(tmpkey, reg->secret + 1, sizeof(tmpkey));
            tmpkey[strlen(tmpkey) - 1] = '\0';
            res = authenticate(challenge, NULL, tmpkey, authmethods, &ied, sin, NULL);
         } else
            res = authenticate(challenge, reg->secret, NULL, authmethods, &ied, sin, NULL);
         if (!res) {
            reg->regstate = REG_STATE_AUTHSENT;
            return send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_REGREQ, 0, ied.buf, ied.pos, -1);
         } else
            return -1;
         ast_log(LOG_WARNING, "Registry acknowledge on unknown registery '%s'\n", peer);
   } else   
      ast_log(LOG_NOTICE, "Can't reregister without a reg\n");
   return -1;
}

static void stop_stuff(int callno)
{
   iax2_destroy_helper(iaxs[callno]);
}

static void __auth_reject(const void *nothing)
{
   /* Called from IAX thread only, without iaxs lock */
   int callno = (int)(long)(nothing);
   struct iax_ie_data ied;
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
      memset(&ied, 0, sizeof(ied));
      if (iaxs[callno]->authfail == IAX_COMMAND_REGREJ) {
         iax_ie_append_str(&ied, IAX_IE_CAUSE, "Registration Refused");
         iax_ie_append_byte(&ied, IAX_IE_CAUSECODE, AST_CAUSE_FACILITY_REJECTED);
      } else if (iaxs[callno]->authfail == IAX_COMMAND_REJECT) {
         iax_ie_append_str(&ied, IAX_IE_CAUSE, "No authority found");
         iax_ie_append_byte(&ied, IAX_IE_CAUSECODE, AST_CAUSE_FACILITY_NOT_SUBSCRIBED);
      }
      send_command_final(iaxs[callno], AST_FRAME_IAX, iaxs[callno]->authfail, 0, ied.buf, ied.pos, -1);
   }
   ast_mutex_unlock(&iaxsl[callno]);
}

static int auth_reject(const void *data)
{
   int callno = (int)(long)(data);
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno])
      iaxs[callno]->authid = -1;
   ast_mutex_unlock(&iaxsl[callno]);
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__auth_reject, data))
#endif      
      __auth_reject(data);
   return 0;
}

static int auth_fail(int callno, int failcode)
{
   /* Schedule sending the authentication failure in one second, to prevent
      guessing */
   if (iaxs[callno]) {
      iaxs[callno]->authfail = failcode;
      if (delayreject) {
         AST_SCHED_DEL(sched, iaxs[callno]->authid);
         iaxs[callno]->authid = iax2_sched_add(sched, 1000, auth_reject, (void *)(long)callno);
      } else
         auth_reject((void *)(long)callno);
   }
   return 0;
}

static void __auto_hangup(const void *nothing)
{
   /* Called from IAX thread only, without iaxs lock */
   int callno = (int)(long)(nothing);
   struct iax_ie_data ied;
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
      memset(&ied, 0, sizeof(ied));
      iax_ie_append_str(&ied, IAX_IE_CAUSE, "Timeout");
      iax_ie_append_byte(&ied, IAX_IE_CAUSECODE, AST_CAUSE_NO_USER_RESPONSE);
      send_command_final(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_HANGUP, 0, ied.buf, ied.pos, -1);
   }
   ast_mutex_unlock(&iaxsl[callno]);
}

static int auto_hangup(const void *data)
{
   int callno = (int)(long)(data);
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
      iaxs[callno]->autoid = -1;
   }
   ast_mutex_unlock(&iaxsl[callno]);
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__auto_hangup, data))
#endif      
      __auto_hangup(data);
   return 0;
}

static void iax2_dprequest(struct iax2_dpcache *dp, int callno)
{
   struct iax_ie_data ied;
   /* Auto-hangup with 30 seconds of inactivity */
   AST_SCHED_DEL(sched, iaxs[callno]->autoid);
   iaxs[callno]->autoid = iax2_sched_add(sched, 30000, auto_hangup, (void *)(long)callno);
   memset(&ied, 0, sizeof(ied));
   iax_ie_append_str(&ied, IAX_IE_CALLED_NUMBER, dp->exten);
   send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_DPREQ, 0, ied.buf, ied.pos, -1);
   dp->flags |= CACHE_FLAG_TRANSMITTED;
}

static int iax2_vnak(int callno)
{
   return send_command_immediate(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_VNAK, 0, NULL, 0, iaxs[callno]->iseqno);
}

static void vnak_retransmit(int callno, int last)
{
   struct iax_frame *f;

   AST_LIST_LOCK(&iaxq.queue);
   AST_LIST_TRAVERSE(&iaxq.queue, f, list) {
      /* Send a copy immediately */
      if ((f->callno == callno) && iaxs[f->callno] &&
         ((unsigned char ) (f->oseqno - last) < 128) &&
         (f->retries >= 0)) {
         send_packet(f);
      }
   }
   AST_LIST_UNLOCK(&iaxq.queue);
}

static void __iax2_poke_peer_s(const void *data)
{
   struct iax2_peer *peer = (struct iax2_peer *)data;
   iax2_poke_peer(peer, 0);
   peer_unref(peer);
}

static int iax2_poke_peer_s(const void *data)
{
   struct iax2_peer *peer = (struct iax2_peer *)data;
   peer->pokeexpire = -1;
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__iax2_poke_peer_s, data))
#endif      
      __iax2_poke_peer_s(data);
   return 0;
}

static int send_trunk(struct iax2_trunk_peer *tpeer, struct timeval *now)
{
   int res = 0;
   struct iax_frame *fr;
   struct ast_iax2_meta_hdr *meta;
   struct ast_iax2_meta_trunk_hdr *mth;
   int calls = 0;
   
   /* Point to frame */
   fr = (struct iax_frame *)tpeer->trunkdata;
   /* Point to meta data */
   meta = (struct ast_iax2_meta_hdr *)fr->afdata;
   mth = (struct ast_iax2_meta_trunk_hdr *)meta->data;
   if (tpeer->trunkdatalen) {
      /* We're actually sending a frame, so fill the meta trunk header and meta header */
      meta->zeros = 0;
      meta->metacmd = IAX_META_TRUNK;
      if (ast_test_flag(&globalflags, IAX_TRUNKTIMESTAMPS))
         meta->cmddata = IAX_META_TRUNK_MINI;
      else
         meta->cmddata = IAX_META_TRUNK_SUPERMINI;
      mth->ts = htonl(calc_txpeerstamp(tpeer, trunkfreq, now));
      /* And the rest of the ast_iax2 header */
      fr->direction = DIRECTION_OUTGRESS;
      fr->retrans = -1;
      fr->transfer = 0;
      /* Any appropriate call will do */
      fr->data = fr->afdata;
      fr->datalen = tpeer->trunkdatalen + sizeof(struct ast_iax2_meta_hdr) + sizeof(struct ast_iax2_meta_trunk_hdr);
      res = transmit_trunk(fr, &tpeer->addr, tpeer->sockfd);
      calls = tpeer->calls;
#if 0
      if (option_debug)
         ast_log(LOG_DEBUG, "Trunking %d call chunks in %d bytes to %s:%d, ts=%d\n", calls, fr->datalen, ast_inet_ntoa(tpeer->addr.sin_addr), ntohs(tpeer->addr.sin_port), ntohl(mth->ts));
#endif      
      /* Reset transmit trunk side data */
      tpeer->trunkdatalen = 0;
      tpeer->calls = 0;
   }
   if (res < 0)
      return res;
   return calls;
}

static inline int iax2_trunk_expired(struct iax2_trunk_peer *tpeer, struct timeval *now)
{
   /* Drop when trunk is about 5 seconds idle */
   if (now->tv_sec > tpeer->trunkact.tv_sec + 5) 
      return 1;
   return 0;
}

static int timing_read(int *id, int fd, short events, void *cbdata)
{
   char buf[1024];
   int res;
   struct iax2_trunk_peer *tpeer, *prev = NULL, *drop=NULL;
   int processed = 0;
   int totalcalls = 0;
#ifdef ZT_TIMERACK
   int x = 1;
#endif
   struct timeval now;
   if (iaxtrunkdebug)
      ast_verbose("Beginning trunk processing. Trunk queue ceiling is %d bytes per host\n", MAX_TRUNKDATA);
   gettimeofday(&now, NULL);
   if (events & AST_IO_PRI) {
#ifdef ZT_TIMERACK
      /* Great, this is a timing interface, just call the ioctl */
      if (ioctl(fd, ZT_TIMERACK, &x)) {
         ast_log(LOG_WARNING, "Unable to acknowledge zap timer. IAX trunking will fail!\n");
         usleep(1);
         return -1;
      }
#endif      
   } else {
      /* Read and ignore from the pseudo channel for timing */
      res = read(fd, buf, sizeof(buf));
      if (res < 1) {
         ast_log(LOG_WARNING, "Unable to read from timing fd\n");
         return 1;
      }
   }
   /* For each peer that supports trunking... */
   ast_mutex_lock(&tpeerlock);
   tpeer = tpeers;
   while(tpeer) {
      processed++;
      res = 0;
      ast_mutex_lock(&tpeer->lock);
      /* We can drop a single tpeer per pass.  That makes all this logic
         substantially easier */
      if (!drop && iax2_trunk_expired(tpeer, &now)) {
         /* Take it out of the list, but don't free it yet, because it
            could be in use */
         if (prev)
            prev->next = tpeer->next;
         else
            tpeers = tpeer->next;
         drop = tpeer;
      } else {
         res = send_trunk(tpeer, &now);
         if (iaxtrunkdebug)
            ast_verbose(" - Trunk peer (%s:%d) has %d call chunk%s in transit, %d bytes backloged and has hit a high water mark of %d bytes\n", ast_inet_ntoa(tpeer->addr.sin_addr), ntohs(tpeer->addr.sin_port), res, (res != 1) ? "s" : "", tpeer->trunkdatalen, tpeer->trunkdataalloc);
      }     
      totalcalls += res;   
      res = 0;
      ast_mutex_unlock(&tpeer->lock);
      prev = tpeer;
      tpeer = tpeer->next;
   }
   ast_mutex_unlock(&tpeerlock);
   if (drop) {
      ast_mutex_lock(&drop->lock);
      /* Once we have this lock, we're sure nobody else is using it or could use it once we release it, 
         because by the time they could get tpeerlock, we've already grabbed it */
      if (option_debug)
         ast_log(LOG_DEBUG, "Dropping unused iax2 trunk peer '%s:%d'\n", ast_inet_ntoa(drop->addr.sin_addr), ntohs(drop->addr.sin_port));
      if (drop->trunkdata) {
         free(drop->trunkdata);
         drop->trunkdata = NULL;
      }
      ast_mutex_unlock(&drop->lock);
      ast_mutex_destroy(&drop->lock);
      free(drop);
      
   }
   if (iaxtrunkdebug)
      ast_verbose("Ending trunk processing with %d peers and %d call chunks processed\n", processed, totalcalls);
   iaxtrunkdebug =0;
   return 1;
}

struct dpreq_data {
   int callno;
   char context[AST_MAX_EXTENSION];
   char callednum[AST_MAX_EXTENSION];
   char *callerid;
};

static void dp_lookup(int callno, const char *context, const char *callednum, const char *callerid, int skiplock)
{
   unsigned short dpstatus = 0;
   struct iax_ie_data ied1;
   int mm;

   memset(&ied1, 0, sizeof(ied1));
   mm = ast_matchmore_extension(NULL, context, callednum, 1, callerid);
   /* Must be started */
   if (!strcmp(callednum, ast_parking_ext()) || ast_exists_extension(NULL, context, callednum, 1, callerid)) {
      dpstatus = IAX_DPSTATUS_EXISTS;
   } else if (ast_canmatch_extension(NULL, context, callednum, 1, callerid)) {
      dpstatus = IAX_DPSTATUS_CANEXIST;
   } else {
      dpstatus = IAX_DPSTATUS_NONEXISTENT;
   }
   if (ast_ignore_pattern(context, callednum))
      dpstatus |= IAX_DPSTATUS_IGNOREPAT;
   if (mm)
      dpstatus |= IAX_DPSTATUS_MATCHMORE;
   if (!skiplock)
      ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
      iax_ie_append_str(&ied1, IAX_IE_CALLED_NUMBER, callednum);
      iax_ie_append_short(&ied1, IAX_IE_DPSTATUS, dpstatus);
      iax_ie_append_short(&ied1, IAX_IE_REFRESH, iaxdefaultdpcache);
      send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_DPREP, 0, ied1.buf, ied1.pos, -1);
   }
   if (!skiplock)
      ast_mutex_unlock(&iaxsl[callno]);
}

static void *dp_lookup_thread(void *data)
{
   /* Look up for dpreq */
   struct dpreq_data *dpr = data;
   dp_lookup(dpr->callno, dpr->context, dpr->callednum, dpr->callerid, 0);
   if (dpr->callerid)
      free(dpr->callerid);
   free(dpr);
   return NULL;
}

static void spawn_dp_lookup(int callno, const char *context, const char *callednum, const char *callerid)
{
   pthread_t newthread;
   struct dpreq_data *dpr;
   pthread_attr_t attr;
   
   if (!(dpr = ast_calloc(1, sizeof(*dpr))))
      return;

   pthread_attr_init(&attr);
   pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);   

   dpr->callno = callno;
   ast_copy_string(dpr->context, context, sizeof(dpr->context));
   ast_copy_string(dpr->callednum, callednum, sizeof(dpr->callednum));
   if (callerid)
      dpr->callerid = ast_strdup(callerid);
   if (ast_pthread_create(&newthread, &attr, dp_lookup_thread, dpr)) {
      ast_log(LOG_WARNING, "Unable to start lookup thread!\n");
   }

   pthread_attr_destroy(&attr);
}

struct iax_dual {
   struct ast_channel *chan1;
   struct ast_channel *chan2;
};

static void *iax_park_thread(void *stuff)
{
   struct ast_channel *chan1, *chan2;
   struct iax_dual *d;
   struct ast_frame *f;
   int ext;
   int res;
   d = stuff;
   chan1 = d->chan1;
   chan2 = d->chan2;
   free(d);
   f = ast_read(chan1);
   if (f)
      ast_frfree(f);
   res = ast_park_call(chan1, chan2, 0, &ext);
   ast_hangup(chan2);
   ast_log(LOG_NOTICE, "Parked on extension '%d'\n", ext);
   return NULL;
}

static int iax_park(struct ast_channel *chan1, struct ast_channel *chan2)
{
   struct iax_dual *d;
   struct ast_channel *chan1m, *chan2m;
   pthread_t th;
   chan1m = ast_channel_alloc(0, AST_STATE_DOWN, 0, 0, chan2->accountcode, chan1->exten, chan1->context, chan1->amaflags, "Parking/%s", chan1->name);
   chan2m = ast_channel_alloc(0, AST_STATE_DOWN, 0, 0, chan2->accountcode, chan2->exten, chan2->context, chan2->amaflags, "IAXPeer/%s",chan2->name);
   if (chan2m && chan1m) {
      /* Make formats okay */
      chan1m->readformat = chan1->readformat;
      chan1m->writeformat = chan1->writeformat;
      ast_channel_masquerade(chan1m, chan1);
      /* Setup the extensions and such */
      ast_copy_string(chan1m->context, chan1->context, sizeof(chan1m->context));
      ast_copy_string(chan1m->exten, chan1->exten, sizeof(chan1m->exten));
      chan1m->priority = chan1->priority;
      
      /* We make a clone of the peer channel too, so we can play
         back the announcement */
      /* Make formats okay */
      chan2m->readformat = chan2->readformat;
      chan2m->writeformat = chan2->writeformat;
      ast_channel_masquerade(chan2m, chan2);
      /* Setup the extensions and such */
      ast_copy_string(chan2m->context, chan2->context, sizeof(chan2m->context));
      ast_copy_string(chan2m->exten, chan2->exten, sizeof(chan2m->exten));
      chan2m->priority = chan2->priority;
      if (ast_do_masquerade(chan2m)) {
         ast_log(LOG_WARNING, "Masquerade failed :(\n");
         ast_hangup(chan2m);
         return -1;
      }
   } else {
      if (chan1m)
         ast_hangup(chan1m);
      if (chan2m)
         ast_hangup(chan2m);
      return -1;
   }
   if ((d = ast_calloc(1, sizeof(*d)))) {
      pthread_attr_t attr;

      pthread_attr_init(&attr);
      pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

      d->chan1 = chan1m;
      d->chan2 = chan2m;
      if (!ast_pthread_create_background(&th, &attr, iax_park_thread, d)) {
         pthread_attr_destroy(&attr);
         return 0;
      }
      pthread_attr_destroy(&attr);
      free(d);
   }
   return -1;
}


static int iax2_provision(struct sockaddr_in *end, int sockfd, char *dest, const char *template, int force);

static int check_provisioning(struct sockaddr_in *sin, int sockfd, char *si, unsigned int ver)
{
   unsigned int ourver;
   char rsi[80];
   snprintf(rsi, sizeof(rsi), "si-%s", si);
   if (iax_provision_version(&ourver, rsi, 1))
      return 0;
   if (option_debug)
      ast_log(LOG_DEBUG, "Service identifier '%s', we think '%08x', they think '%08x'\n", si, ourver, ver);
   if (ourver != ver) 
      iax2_provision(sin, sockfd, NULL, rsi, 1);
   return 0;
}

static void construct_rr(struct chan_iax2_pvt *pvt, struct iax_ie_data *iep) 
{
   jb_info stats;
   jb_getinfo(pvt->jb, &stats);
   
   memset(iep, 0, sizeof(*iep));

   iax_ie_append_int(iep,IAX_IE_RR_JITTER, stats.jitter);
   if(stats.frames_in == 0) stats.frames_in = 1;
   iax_ie_append_int(iep,IAX_IE_RR_LOSS, ((0xff & (stats.losspct/1000)) << 24 | (stats.frames_lost & 0x00ffffff)));
   iax_ie_append_int(iep,IAX_IE_RR_PKTS, stats.frames_in);
   iax_ie_append_short(iep,IAX_IE_RR_DELAY, stats.current - stats.min);
   iax_ie_append_int(iep,IAX_IE_RR_DROPPED, stats.frames_dropped);
   iax_ie_append_int(iep,IAX_IE_RR_OOO, stats.frames_ooo);
}

static void save_rr(struct iax_frame *fr, struct iax_ies *ies) 
{
   iaxs[fr->callno]->remote_rr.jitter = ies->rr_jitter;
   iaxs[fr->callno]->remote_rr.losspct = ies->rr_loss >> 24;
   iaxs[fr->callno]->remote_rr.losscnt = ies->rr_loss & 0xffffff;
   iaxs[fr->callno]->remote_rr.packets = ies->rr_pkts;
   iaxs[fr->callno]->remote_rr.delay = ies->rr_delay;
   iaxs[fr->callno]->remote_rr.dropped = ies->rr_dropped;
   iaxs[fr->callno]->remote_rr.ooo = ies->rr_ooo;
}

static int socket_process(struct iax2_thread *thread);

/*!
 * \brief Handle any deferred full frames for this thread
 */
static void handle_deferred_full_frames(struct iax2_thread *thread)
{
   struct iax2_pkt_buf *pkt_buf;

   ast_mutex_lock(&thread->lock);

   while ((pkt_buf = AST_LIST_REMOVE_HEAD(&thread->full_frames, entry))) {
      ast_mutex_unlock(&thread->lock);

      thread->buf = pkt_buf->buf;
      thread->buf_len = pkt_buf->len;
      thread->buf_size = pkt_buf->len + 1;
      
      socket_process(thread);

      thread->buf = NULL;
      ast_free(pkt_buf);

      ast_mutex_lock(&thread->lock);
   }

   ast_mutex_unlock(&thread->lock);
}

/*!
 * \brief Queue the last read full frame for processing by a certain thread
 *
 * If there are already any full frames queued, they are sorted
 * by sequence number.
 */
static void defer_full_frame(struct iax2_thread *from_here, struct iax2_thread *to_here)
{
   struct iax2_pkt_buf *pkt_buf, *cur_pkt_buf;
   struct ast_iax2_full_hdr *fh, *cur_fh;

   if (!(pkt_buf = ast_calloc(1, sizeof(*pkt_buf) + from_here->buf_len)))
      return;

   pkt_buf->len = from_here->buf_len;
   memcpy(pkt_buf->buf, from_here->buf, pkt_buf->len);

   fh = (struct ast_iax2_full_hdr *) pkt_buf->buf;
   ast_mutex_lock(&to_here->lock);
   AST_LIST_TRAVERSE_SAFE_BEGIN(&to_here->full_frames, cur_pkt_buf, entry) {
      cur_fh = (struct ast_iax2_full_hdr *) cur_pkt_buf->buf;
      if (fh->oseqno < cur_fh->oseqno) {
         AST_LIST_INSERT_BEFORE_CURRENT(&to_here->full_frames, pkt_buf, entry);
         break;
      }
   }
   AST_LIST_TRAVERSE_SAFE_END

   if (!cur_pkt_buf)
      AST_LIST_INSERT_TAIL(&to_here->full_frames, pkt_buf, entry);
   
   ast_mutex_unlock(&to_here->lock);
}

static int socket_read(int *id, int fd, short events, void *cbdata)
{
   struct iax2_thread *thread;
   socklen_t len;
   time_t t;
   static time_t last_errtime = 0;
   struct ast_iax2_full_hdr *fh;

   if (!(thread = find_idle_thread())) {
      time(&t);
      if (t != last_errtime && option_debug)
         ast_log(LOG_DEBUG, "Out of idle IAX2 threads for I/O, pausing!\n");
      last_errtime = t;
      usleep(1);
      return 1;
   }

   len = sizeof(thread->iosin);
   thread->iofd = fd;
   thread->buf_len = recvfrom(fd, thread->readbuf, sizeof(thread->readbuf), 0, (struct sockaddr *) &thread->iosin, &len);
   thread->buf_size = sizeof(thread->readbuf);
   thread->buf = thread->readbuf;
   if (thread->buf_len < 0) {
      if (errno != ECONNREFUSED && errno != EAGAIN)
         ast_log(LOG_WARNING, "Error: %s\n", strerror(errno));
      handle_error();
      thread->iostate = IAX_IOSTATE_IDLE;
      signal_condition(&thread->lock, &thread->cond);
      return 1;
   }
   if (test_losspct && ((100.0 * ast_random() / (RAND_MAX + 1.0)) < test_losspct)) { /* simulate random loss condition */
      thread->iostate = IAX_IOSTATE_IDLE;
      signal_condition(&thread->lock, &thread->cond);
      return 1;
   }
   
   /* Determine if this frame is a full frame; if so, and any thread is currently
      processing a full frame for the same callno from this peer, then drop this
      frame (and the peer will retransmit it) */
   fh = (struct ast_iax2_full_hdr *) thread->buf;
   if (ntohs(fh->scallno) & IAX_FLAG_FULL) {
      struct iax2_thread *cur = NULL;
      uint16_t callno = ntohs(fh->scallno) & ~IAX_FLAG_FULL;
      
      AST_LIST_LOCK(&active_list);
      AST_LIST_TRAVERSE(&active_list, cur, list) {
         if ((cur->ffinfo.callno == callno) &&
             !inaddrcmp(&cur->ffinfo.sin, &thread->iosin))
            break;
      }
      if (cur) {
         /* we found another thread processing a full frame for this call,
            so queue it up for processing later. */
         defer_full_frame(thread, cur);
         AST_LIST_UNLOCK(&active_list);
         thread->iostate = IAX_IOSTATE_IDLE;
         signal_condition(&thread->lock, &thread->cond);
         return 1;
      } else {
         /* this thread is going to process this frame, so mark it */
         thread->ffinfo.callno = callno;
         memcpy(&thread->ffinfo.sin, &thread->iosin, sizeof(thread->ffinfo.sin));
         thread->ffinfo.type = fh->type;
         thread->ffinfo.csub = fh->csub;
      }
      AST_LIST_UNLOCK(&active_list);
   }
   
   /* Mark as ready and send on its way */
   thread->iostate = IAX_IOSTATE_READY;
#ifdef DEBUG_SCHED_MULTITHREAD
   ast_copy_string(thread->curfunc, "socket_process", sizeof(thread->curfunc));
#endif
   signal_condition(&thread->lock, &thread->cond);

   return 1;
}

static int socket_process(struct iax2_thread *thread)
{
   struct sockaddr_in sin;
   int res;
   int updatehistory=1;
   int new = NEW_PREVENT;
   void *ptr;
   int dcallno = 0;
   struct ast_iax2_full_hdr *fh = (struct ast_iax2_full_hdr *)thread->buf;
   struct ast_iax2_mini_hdr *mh = (struct ast_iax2_mini_hdr *)thread->buf;
   struct ast_iax2_meta_hdr *meta = (struct ast_iax2_meta_hdr *)thread->buf;
   struct ast_iax2_video_hdr *vh = (struct ast_iax2_video_hdr *)thread->buf;
   struct ast_iax2_meta_trunk_hdr *mth;
   struct ast_iax2_meta_trunk_entry *mte;
   struct ast_iax2_meta_trunk_mini *mtm;
   struct iax_frame *fr;
   struct iax_frame *cur;
   struct ast_frame f = { 0, };
   struct ast_channel *c;
   struct iax2_dpcache *dp;
   struct iax2_peer *peer;
   struct iax2_trunk_peer *tpeer;
   struct timeval rxtrunktime;
   struct iax_ies ies;
   struct iax_ie_data ied0, ied1;
   int format;
   int fd;
   int exists;
   int minivid = 0;
   unsigned int ts;
   char empty[32]="";      /* Safety measure */
   struct iax_frame *duped_fr;
   char host_pref_buf[128];
   char caller_pref_buf[128];
   struct ast_codec_pref pref;
   char *using_prefs = "mine";

   /* allocate an iax_frame with 4096 bytes of data buffer */
   fr = alloca(sizeof(*fr) + 4096);
   memset(fr, 0, sizeof(*fr));
   fr->afdatalen = 4096; /* From alloca() above */

   /* Copy frequently used parameters to the stack */
   res = thread->buf_len;
   fd = thread->iofd;
   memcpy(&sin, &thread->iosin, sizeof(sin));

   if (res < sizeof(*mh)) {
      ast_log(LOG_WARNING, "midget packet received (%d of %zd min)\n", res, sizeof(*mh));
      return 1;
   }
   if ((vh->zeros == 0) && (ntohs(vh->callno) & 0x8000)) {
      if (res < sizeof(*vh)) {
         ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a video frame but is too short\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
         return 1;
      }

      /* This is a video frame, get call number */
      fr->callno = find_callno(ntohs(vh->callno) & ~0x8000, dcallno, &sin, new, fd, 0);
      minivid = 1;
   } else if ((meta->zeros == 0) && !(ntohs(meta->metacmd) & 0x8000)) {
      unsigned char metatype;

      if (res < sizeof(*meta)) {
         ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a meta frame but is too short\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
         return 1;
      }

      /* This is a meta header */
      switch(meta->metacmd) {
      case IAX_META_TRUNK:
         if (res < (sizeof(*meta) + sizeof(*mth))) {
            ast_log(LOG_WARNING, "midget meta trunk packet received (%d of %zd min)\n", res,
               sizeof(*meta) + sizeof(*mth));
            return 1;
         }
         mth = (struct ast_iax2_meta_trunk_hdr *)(meta->data);
         ts = ntohl(mth->ts);
         metatype = meta->cmddata;
         res -= (sizeof(*meta) + sizeof(*mth));
         ptr = mth->data;
         tpeer = find_tpeer(&sin, fd);
         if (!tpeer) {
            ast_log(LOG_WARNING, "Unable to accept trunked packet from '%s:%d': No matching peer\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
            return 1;
         }
         tpeer->trunkact = ast_tvnow();
         if (!ts || ast_tvzero(tpeer->rxtrunktime))
            tpeer->rxtrunktime = tpeer->trunkact;
         rxtrunktime = tpeer->rxtrunktime;
         ast_mutex_unlock(&tpeer->lock);
         while(res >= sizeof(*mte)) {
            /* Process channels */
            unsigned short callno, trunked_ts, len;

            if (metatype == IAX_META_TRUNK_MINI) {
               mtm = (struct ast_iax2_meta_trunk_mini *)ptr;
               ptr += sizeof(*mtm);
               res -= sizeof(*mtm);
               len = ntohs(mtm->len);
               callno = ntohs(mtm->mini.callno);
               trunked_ts = ntohs(mtm->mini.ts);
            } else if (metatype == IAX_META_TRUNK_SUPERMINI) {
               mte = (struct ast_iax2_meta_trunk_entry *)ptr;
               ptr += sizeof(*mte);
               res -= sizeof(*mte);
               len = ntohs(mte->len);
               callno = ntohs(mte->callno);
               trunked_ts = 0;
            } else {
               ast_log(LOG_WARNING, "Unknown meta trunk cmd from '%s:%d': dropping\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
               break;
            }
            /* Stop if we don't have enough data */
            if (len > res)
               break;
            fr->callno = find_callno_locked(callno & ~IAX_FLAG_FULL, 0, &sin, NEW_PREVENT, fd, 0);
            if (fr->callno) {
               /* If it's a valid call, deliver the contents.  If not, we
                  drop it, since we don't have a scallno to use for an INVAL */
               /* Process as a mini frame */
               memset(&f, 0, sizeof(f));
               f.frametype = AST_FRAME_VOICE;
               if (iaxs[fr->callno]) {
                  if (iaxs[fr->callno]->voiceformat > 0) {
                     f.subclass = iaxs[fr->callno]->voiceformat;
                     f.datalen = len;
                     if (f.datalen >= 0) {
                        if (f.datalen)
                           f.data = ptr;
                        if(trunked_ts) {
                           fr->ts = (iaxs[fr->callno]->last & 0xFFFF0000L) | (trunked_ts & 0xffff);
                        } else
                           fr->ts = fix_peerts(&rxtrunktime, fr->callno, ts);
                        /* Don't pass any packets until we're started */
                        if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED)) {
                           /* Common things */
                           f.src = "IAX2";
                           if (f.datalen && (f.frametype == AST_FRAME_VOICE)) 
                              f.samples = ast_codec_get_samples(&f);
                           iax_frame_wrap(fr, &f);
                           duped_fr = iaxfrdup2(fr);
                           if (duped_fr) {
                              schedule_delivery(duped_fr, updatehistory, 1, &fr->ts);
                           }
                           /* It is possible for the pvt structure to go away after we call schedule_delivery */
                           if (iaxs[fr->callno] && iaxs[fr->callno]->last < fr->ts) {
                              iaxs[fr->callno]->last = fr->ts;
#if 1
                              if (option_debug && iaxdebug)
                                 ast_log(LOG_DEBUG, "For call=%d, set last=%d\n", fr->callno, fr->ts);
#endif
                           }
                        }
                     } else {
                        ast_log(LOG_WARNING, "Datalen < 0?\n");
                     }
                  } else {
                     ast_log(LOG_WARNING, "Received trunked frame before first full voice frame\n ");
                     iax2_vnak(fr->callno);
                  }
               }
               ast_mutex_unlock(&iaxsl[fr->callno]);
            }
            ptr += len;
            res -= len;
         }
         
      }
      return 1;
   }

#ifdef DEBUG_SUPPORT
   if (iaxdebug && (res >= sizeof(*fh)))
      iax_showframe(NULL, fh, 1, &sin, res - sizeof(*fh));
#endif
   if (ntohs(mh->callno) & IAX_FLAG_FULL) {
      if (res < sizeof(*fh)) {
         ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a full frame but is too short\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
         return 1;
      }

      /* Get the destination call number */
      dcallno = ntohs(fh->dcallno) & ~IAX_FLAG_RETRANS;
      /* Retrieve the type and subclass */
      f.frametype = fh->type;
      if (f.frametype == AST_FRAME_VIDEO) {
         f.subclass = uncompress_subclass(fh->csub & ~0x40) | ((fh->csub >> 6) & 0x1);
      } else {
         f.subclass = uncompress_subclass(fh->csub);
      }

      /* Deal with POKE/PONG without allocating a callno */
      if (f.frametype == AST_FRAME_IAX && f.subclass == IAX_COMMAND_POKE) {
         /* Reply back with a PONG, but don't care about the result. */
         send_apathetic_reply(1, ntohs(fh->scallno), &sin, IAX_COMMAND_PONG, ntohs(fh->ts), fh->oseqno);
         return 1;
      } else if (f.frametype == AST_FRAME_IAX && f.subclass == IAX_COMMAND_ACK && dcallno == 1) {
         /* Ignore */
         return 1;
      }

      if ((f.frametype == AST_FRAME_IAX) && ((f.subclass == IAX_COMMAND_NEW) || (f.subclass == IAX_COMMAND_REGREQ) ||
                         (f.subclass == IAX_COMMAND_POKE) || (f.subclass == IAX_COMMAND_FWDOWNL) ||
                         (f.subclass == IAX_COMMAND_REGREL)))
         new = NEW_ALLOW;
   } else {
      /* Don't know anything about it yet */
      f.frametype = AST_FRAME_NULL;
      f.subclass = 0;
   }

   if (!fr->callno) {
      int check_dcallno = 0;

      /*
       * We enforce accurate destination call numbers for all full frames except
       * LAGRQ and PING commands.  This is because older versions of Asterisk
       * schedule these commands to get sent very quickly, and they will sometimes
       * be sent before they receive the first frame from the other side.  When
       * that happens, it doesn't contain the destination call number.  However,
       * not checking it for these frames is safe.
       * 
       * Discussed in the following thread:
       *    http://lists.digium.com/pipermail/asterisk-dev/2008-May/033217.html 
       */

      if (ntohs(mh->callno) & IAX_FLAG_FULL) {
         check_dcallno = f.frametype == AST_FRAME_IAX ? (f.subclass != IAX_COMMAND_PING && f.subclass != IAX_COMMAND_LAGRQ) : 1;
      }

      fr->callno = find_callno(ntohs(mh->callno) & ~IAX_FLAG_FULL, dcallno, &sin, new, fd, check_dcallno);
   }

   if (fr->callno > 0)
      ast_mutex_lock(&iaxsl[fr->callno]);

   if (!fr->callno || !iaxs[fr->callno]) {
      /* A call arrived for a nonexistent destination.  Unless it's an "inval"
         frame, reply with an inval */
      if (ntohs(mh->callno) & IAX_FLAG_FULL) {
         /* We can only raw hangup control frames */
         if (((f.subclass != IAX_COMMAND_INVAL) &&
             (f.subclass != IAX_COMMAND_TXCNT) &&
             (f.subclass != IAX_COMMAND_TXACC) &&
             (f.subclass != IAX_COMMAND_FWDOWNL))||
             (f.frametype != AST_FRAME_IAX))
            raw_hangup(&sin, ntohs(fh->dcallno) & ~IAX_FLAG_RETRANS, ntohs(mh->callno) & ~IAX_FLAG_FULL,
            fd);
      }
      if (fr->callno > 0) 
         ast_mutex_unlock(&iaxsl[fr->callno]);
      return 1;
   }
   if (ast_test_flag(iaxs[fr->callno], IAX_ENCRYPTED)) {
      if (decrypt_frame(fr->callno, fh, &f, &res)) {
         ast_log(LOG_NOTICE, "Packet Decrypt Failed!\n");
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }
#ifdef DEBUG_SUPPORT
      else if (iaxdebug)
         iax_showframe(NULL, fh, 3, &sin, res - sizeof(*fh));
#endif
   }

   /* count this frame */
   iaxs[fr->callno]->frames_received++;

   if (!inaddrcmp(&sin, &iaxs[fr->callno]->addr) && !minivid &&
      f.subclass != IAX_COMMAND_TXCNT &&     /* for attended transfer */
      f.subclass != IAX_COMMAND_TXACC) {     /* for attended transfer */
      unsigned short new_peercallno;

      new_peercallno = (unsigned short) (ntohs(mh->callno) & ~IAX_FLAG_FULL);
      if (new_peercallno && new_peercallno != iaxs[fr->callno]->peercallno) {
         if (iaxs[fr->callno]->peercallno) {
            remove_by_peercallno(iaxs[fr->callno]);
         }
         iaxs[fr->callno]->peercallno = new_peercallno;
         store_by_peercallno(iaxs[fr->callno]);
      }
   }
   if (ntohs(mh->callno) & IAX_FLAG_FULL) {
      if (option_debug  && iaxdebug)
         ast_log(LOG_DEBUG, "Received packet %d, (%d, %d)\n", fh->oseqno, f.frametype, f.subclass);
      /* Check if it's out of order (and not an ACK or INVAL) */
      fr->oseqno = fh->oseqno;
      fr->iseqno = fh->iseqno;
      fr->ts = ntohl(fh->ts);
#ifdef IAXTESTS
      if (test_resync) {
         if (option_debug)
            ast_log(LOG_DEBUG, "Simulating frame ts resync, was %u now %u\n", fr->ts, fr->ts + test_resync);
         fr->ts += test_resync;
      }
#endif /* IAXTESTS */
#if 0
      if ( (ntohs(fh->dcallno) & IAX_FLAG_RETRANS) ||
           ( (f.frametype != AST_FRAME_VOICE) && ! (f.frametype == AST_FRAME_IAX &&
                        (f.subclass == IAX_COMMAND_NEW ||
                         f.subclass == IAX_COMMAND_AUTHREQ ||
                         f.subclass == IAX_COMMAND_ACCEPT ||
                         f.subclass == IAX_COMMAND_REJECT))      ) )
#endif
      if ((ntohs(fh->dcallno) & IAX_FLAG_RETRANS) || (f.frametype != AST_FRAME_VOICE))
         updatehistory = 0;
      if ((iaxs[fr->callno]->iseqno != fr->oseqno) &&
         (iaxs[fr->callno]->iseqno ||
            ((f.subclass != IAX_COMMAND_TXCNT) &&
            (f.subclass != IAX_COMMAND_TXREADY) &&    /* for attended transfer */
            (f.subclass != IAX_COMMAND_TXREL) &&      /* for attended transfer */
            (f.subclass != IAX_COMMAND_UNQUELCH ) &&  /* for attended transfer */
            (f.subclass != IAX_COMMAND_TXACC)) ||
            (f.frametype != AST_FRAME_IAX))) {
         if (
          ((f.subclass != IAX_COMMAND_ACK) &&
           (f.subclass != IAX_COMMAND_INVAL) &&
           (f.subclass != IAX_COMMAND_TXCNT) &&
           (f.subclass != IAX_COMMAND_TXREADY) &&     /* for attended transfer */
           (f.subclass != IAX_COMMAND_TXREL) &&    /* for attended transfer */
           (f.subclass != IAX_COMMAND_UNQUELCH ) &&   /* for attended transfer */
           (f.subclass != IAX_COMMAND_TXACC) &&
           (f.subclass != IAX_COMMAND_VNAK)) ||
           (f.frametype != AST_FRAME_IAX)) {
            /* If it's not an ACK packet, it's out of order. */
            if (option_debug)
               ast_log(LOG_DEBUG, "Packet arrived out of order (expecting %d, got %d) (frametype = %d, subclass = %d)\n", 
                  iaxs[fr->callno]->iseqno, fr->oseqno, f.frametype, f.subclass);
            /* Check to see if we need to request retransmission,
             * and take sequence number wraparound into account */
            if ((unsigned char) (iaxs[fr->callno]->iseqno - fr->oseqno) < 128) {
               /* If we've already seen it, ack it XXX There's a border condition here XXX */
               if ((f.frametype != AST_FRAME_IAX) || 
                     ((f.subclass != IAX_COMMAND_ACK) && (f.subclass != IAX_COMMAND_INVAL))) {
                  if (option_debug)
                     ast_log(LOG_DEBUG, "Acking anyway\n");
                  /* XXX Maybe we should handle its ack to us, but then again, it's probably outdated anyway, and if
                     we have anything to send, we'll retransmit and get an ACK back anyway XXX */
                  send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
               }
            } else {
               /* Send a VNAK requesting retransmission */
               iax2_vnak(fr->callno);
            }
            ast_mutex_unlock(&iaxsl[fr->callno]);
            return 1;
         }
      } else {
         /* Increment unless it's an ACK or VNAK */
         if (((f.subclass != IAX_COMMAND_ACK) &&
             (f.subclass != IAX_COMMAND_INVAL) &&
             (f.subclass != IAX_COMMAND_TXCNT) &&
             (f.subclass != IAX_COMMAND_TXACC) &&
            (f.subclass != IAX_COMMAND_VNAK)) ||
             (f.frametype != AST_FRAME_IAX))
            iaxs[fr->callno]->iseqno++;
      }
      /* A full frame */
      if (res < sizeof(*fh)) {
         ast_log(LOG_WARNING, "midget packet received (%d of %zd min)\n", res, sizeof(*fh));
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }
      /* Ensure text frames are NULL-terminated */
      if (f.frametype == AST_FRAME_TEXT && thread->buf[res - 1] != '\0') {
         if (res < thread->buf_size)
            thread->buf[res++] = '\0';
         else /* Trims one character from the text message, but that's better than overwriting the end of the buffer. */
            thread->buf[res - 1] = '\0';
      }
      f.datalen = res - sizeof(*fh);

      /* Handle implicit ACKing unless this is an INVAL, and only if this is 
         from the real peer, not the transfer peer */
      if (!inaddrcmp(&sin, &iaxs[fr->callno]->addr) && 
          ((f.subclass != IAX_COMMAND_INVAL) ||
           (f.frametype != AST_FRAME_IAX))) {
         unsigned char x;
         int call_to_destroy;
         /* XXX This code is not very efficient.  Surely there is a better way which still
                properly handles boundary conditions? XXX */
         /* First we have to qualify that the ACKed value is within our window */
         for (x=iaxs[fr->callno]->rseqno; x != iaxs[fr->callno]->oseqno; x++)
            if (fr->iseqno == x)
               break;
         if ((x != iaxs[fr->callno]->oseqno) || (iaxs[fr->callno]->oseqno == fr->iseqno)) {
            /* The acknowledgement is within our window.  Time to acknowledge everything
               that it says to */
            for (x=iaxs[fr->callno]->rseqno; x != fr->iseqno; x++) {
               /* Ack the packet with the given timestamp */
               if (option_debug && iaxdebug)
                  ast_log(LOG_DEBUG, "Cancelling transmission of packet %d\n", x);
               call_to_destroy = 0;
               AST_LIST_LOCK(&iaxq.queue);
               AST_LIST_TRAVERSE(&iaxq.queue, cur, list) {
                  /* If it's our call, and our timestamp, mark -1 retries */
                  if ((fr->callno == cur->callno) && (x == cur->oseqno)) {
                     cur->retries = -1;
                     /* Destroy call if this is the end */
                     if (cur->final)
                        call_to_destroy = fr->callno;
                  }
               }
               AST_LIST_UNLOCK(&iaxq.queue);
               if (call_to_destroy) {
                  if (iaxdebug && option_debug)
                     ast_log(LOG_DEBUG, "Really destroying %d, having been acked on final message\n", call_to_destroy);
                  ast_mutex_lock(&iaxsl[call_to_destroy]);
                  iax2_destroy(call_to_destroy);
                  ast_mutex_unlock(&iaxsl[call_to_destroy]);
               }
            }
            /* Note how much we've received acknowledgement for */
            if (iaxs[fr->callno])
               iaxs[fr->callno]->rseqno = fr->iseqno;
            else {
               /* Stop processing now */
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
         } else if (option_debug)
            ast_log(LOG_DEBUG, "Received iseqno %d not within window %d->%d\n", fr->iseqno, iaxs[fr->callno]->rseqno, iaxs[fr->callno]->oseqno);
      }
      if (inaddrcmp(&sin, &iaxs[fr->callno]->addr) && 
         ((f.frametype != AST_FRAME_IAX) || 
          ((f.subclass != IAX_COMMAND_TXACC) &&
           (f.subclass != IAX_COMMAND_TXCNT)))) {
         /* Only messages we accept from a transfer host are TXACC and TXCNT */
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }

      if (f.datalen) {
         if (f.frametype == AST_FRAME_IAX) {
            if (iax_parse_ies(&ies, thread->buf + sizeof(*fh), f.datalen)) {
               ast_log(LOG_WARNING, "Undecodable frame received from '%s'\n", ast_inet_ntoa(sin.sin_addr));
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            f.data = NULL;
            f.datalen = 0;
         } else
            f.data = thread->buf + sizeof(*fh);
      } else {
         if (f.frametype == AST_FRAME_IAX)
            f.data = NULL;
         else
            f.data = empty;
         memset(&ies, 0, sizeof(ies));
      }

      /* when we receive the first full frame for a new incoming channel,
         it is safe to start the PBX on the channel because we have now
         completed a 3-way handshake with the peer */
      if ((f.frametype == AST_FRAME_VOICE) ||
          (f.frametype == AST_FRAME_VIDEO) ||
          (f.frametype == AST_FRAME_IAX)) {
         if (ast_test_flag(iaxs[fr->callno], IAX_DELAYPBXSTART)) {
            ast_clear_flag(iaxs[fr->callno], IAX_DELAYPBXSTART);
            if (!ast_iax2_new(fr->callno, AST_STATE_RING, iaxs[fr->callno]->chosenformat)) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
         }
      }

      if (f.frametype == AST_FRAME_VOICE) {
         if (f.subclass != iaxs[fr->callno]->voiceformat) {
               iaxs[fr->callno]->voiceformat = f.subclass;
               if (option_debug)
                  ast_log(LOG_DEBUG, "Ooh, voice format changed to %d\n", f.subclass);
               if (iaxs[fr->callno]->owner) {
                  int orignative;
retryowner:
                  if (ast_mutex_trylock(&iaxs[fr->callno]->owner->lock)) {
                     DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
                     if (iaxs[fr->callno] && iaxs[fr->callno]->owner) goto retryowner;
                  }
                  if (iaxs[fr->callno]) {
                     if (iaxs[fr->callno]->owner) {
                        orignative = iaxs[fr->callno]->owner->nativeformats;
                        iaxs[fr->callno]->owner->nativeformats = f.subclass;
                        if (iaxs[fr->callno]->owner->readformat)
                           ast_set_read_format(iaxs[fr->callno]->owner, iaxs[fr->callno]->owner->readformat);
                        iaxs[fr->callno]->owner->nativeformats = orignative;
                        ast_mutex_unlock(&iaxs[fr->callno]->owner->lock);
                     }
                  } else {
                     if (option_debug)
                        ast_log(LOG_DEBUG, "Neat, somebody took away the channel at a magical time but i found it!\n");
                     ast_mutex_unlock(&iaxsl[fr->callno]);
                     return 1;
                  }
               }
         }
      }
      if (f.frametype == AST_FRAME_VIDEO) {
         if (f.subclass != iaxs[fr->callno]->videoformat) {
            if (option_debug)
               ast_log(LOG_DEBUG, "Ooh, video format changed to %d\n", f.subclass & ~0x1);
            iaxs[fr->callno]->videoformat = f.subclass & ~0x1;
         }
      }
      if (f.frametype == AST_FRAME_IAX) {
         AST_SCHED_DEL(sched, iaxs[fr->callno]->initid);
         /* Handle the IAX pseudo frame itself */
         if (option_debug && iaxdebug)
            ast_log(LOG_DEBUG, "IAX subclass %d received\n", f.subclass);

                        /* Update last ts unless the frame's timestamp originated with us. */
         if (iaxs[fr->callno]->last < fr->ts &&
                            f.subclass != IAX_COMMAND_ACK &&
                            f.subclass != IAX_COMMAND_PONG &&
                            f.subclass != IAX_COMMAND_LAGRP) {
            iaxs[fr->callno]->last = fr->ts;
            if (option_debug && iaxdebug)
               ast_log(LOG_DEBUG, "For call=%d, set last=%d\n", fr->callno, fr->ts);
         }

         switch(f.subclass) {
         case IAX_COMMAND_ACK:
            /* Do nothing */
            break;
         case IAX_COMMAND_QUELCH:
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED)) {
                    /* Generate Manager Hold event, if necessary*/
               if (iaxs[fr->callno]->owner) {
                  manager_event(EVENT_FLAG_CALL, "Hold",
                     "Channel: %s\r\n"
                     "Uniqueid: %s\r\n",
                     iaxs[fr->callno]->owner->name, 
                     iaxs[fr->callno]->owner->uniqueid);
               }

               ast_set_flag(iaxs[fr->callno], IAX_QUELCH);
               if (ies.musiconhold) {
                  if (iaxs[fr->callno]->owner && ast_bridged_channel(iaxs[fr->callno]->owner)) {
                     const char *mohsuggest = iaxs[fr->callno]->mohsuggest;
                     iax2_queue_control_data(fr->callno, AST_CONTROL_HOLD, 
                        S_OR(mohsuggest, NULL),
                        !ast_strlen_zero(mohsuggest) ? strlen(mohsuggest) + 1 : 0);
                     if (!iaxs[fr->callno]) {
                        ast_mutex_unlock(&iaxsl[fr->callno]);
                        return 1;
                     }
                  }
               }
            }
            break;
         case IAX_COMMAND_UNQUELCH:
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED)) {
                    /* Generate Manager Unhold event, if necessary*/
               if (iaxs[fr->callno]->owner && ast_test_flag(iaxs[fr->callno], IAX_QUELCH)) {
                  manager_event(EVENT_FLAG_CALL, "Unhold",
                     "Channel: %s\r\n"
                     "Uniqueid: %s\r\n",
                     iaxs[fr->callno]->owner->name, 
                     iaxs[fr->callno]->owner->uniqueid);
               }

               ast_clear_flag(iaxs[fr->callno], IAX_QUELCH);
               if (iaxs[fr->callno]->owner && ast_bridged_channel(iaxs[fr->callno]->owner)) {
                  iax2_queue_control_data(fr->callno, AST_CONTROL_UNHOLD, NULL, 0);
                  if (!iaxs[fr->callno]) {
                     ast_mutex_unlock(&iaxsl[fr->callno]);
                     return 1;
                  }
               }
            }
            break;
         case IAX_COMMAND_TXACC:
            if (iaxs[fr->callno]->transferring == TRANSFER_BEGIN) {
               /* Ack the packet with the given timestamp */
               AST_LIST_LOCK(&iaxq.queue);
               AST_LIST_TRAVERSE(&iaxq.queue, cur, list) {
                  /* Cancel any outstanding txcnt's */
                  if ((fr->callno == cur->callno) && (cur->transfer))
                     cur->retries = -1;
               }
               AST_LIST_UNLOCK(&iaxq.queue);
               memset(&ied1, 0, sizeof(ied1));
               iax_ie_append_short(&ied1, IAX_IE_CALLNO, iaxs[fr->callno]->callno);
               send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_TXREADY, 0, ied1.buf, ied1.pos, -1);
               iaxs[fr->callno]->transferring = TRANSFER_READY;
            }
            break;
         case IAX_COMMAND_NEW:
            /* Ignore if it's already up */
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED | IAX_STATE_TBD))
               break;
            if (ies.provverpres && ies.serviceident && sin.sin_addr.s_addr) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               check_provisioning(&sin, fd, ies.serviceident, ies.provver);
               ast_mutex_lock(&iaxsl[fr->callno]);
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
            }
            /* If we're in trunk mode, do it now, and update the trunk number in our frame before continuing */
            if (ast_test_flag(iaxs[fr->callno], IAX_TRUNK)) {
               int new_callno;
               if ((new_callno = make_trunk(fr->callno, 1)) != -1)
                  fr->callno = new_callno;
            }
            /* For security, always ack immediately */
            if (delayreject)
               send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            if (check_access(fr->callno, &sin, &ies)) {
               /* They're not allowed on */
               auth_fail(fr->callno, IAX_COMMAND_REJECT);
               if (authdebug)
                  ast_log(LOG_NOTICE, "Rejected connect attempt from %s, who was trying to reach '%s@%s'\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->exten, iaxs[fr->callno]->context);
               break;
            }
            if (strcasecmp(iaxs[fr->callno]->exten, "TBD")) {
               const char *context, *exten, *cid_num;

               context = ast_strdupa(iaxs[fr->callno]->context);
               exten = ast_strdupa(iaxs[fr->callno]->exten);
               cid_num = ast_strdupa(iaxs[fr->callno]->cid_num);

               /* This might re-enter the IAX code and need the lock */
               ast_mutex_unlock(&iaxsl[fr->callno]);
               exists = ast_exists_extension(NULL, context, exten, 1, cid_num);
               ast_mutex_lock(&iaxsl[fr->callno]);

               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
            } else
               exists = 0;
            if (ast_strlen_zero(iaxs[fr->callno]->secret) && ast_strlen_zero(iaxs[fr->callno]->inkeys)) {
               if (strcmp(iaxs[fr->callno]->exten, "TBD") && !exists) {
                  memset(&ied0, 0, sizeof(ied0));
                  iax_ie_append_str(&ied0, IAX_IE_CAUSE, "No such context/extension");
                  iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_NO_ROUTE_DESTINATION);
                  send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
                  if (!iaxs[fr->callno]) {
                     ast_mutex_unlock(&iaxsl[fr->callno]);
                     return 1;
                  }
                  if (authdebug)
                     ast_log(LOG_NOTICE, "Rejected connect attempt from %s, request '%s@%s' does not exist\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->exten, iaxs[fr->callno]->context);
               } else {
                  /* Select an appropriate format */

                  if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOPREFS)) {
                     if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP)) {
                        using_prefs = "reqonly";
                     } else {
                        using_prefs = "disabled";
                     }
                     format = iaxs[fr->callno]->peerformat & iaxs[fr->callno]->capability;
                     memset(&pref, 0, sizeof(pref));
                     strcpy(caller_pref_buf, "disabled");
                     strcpy(host_pref_buf, "disabled");
                  } else {
                     using_prefs = "mine";
                     /* If the information elements are in here... use them */
                     if (ies.codec_prefs)
                        ast_codec_pref_convert(&iaxs[fr->callno]->rprefs, ies.codec_prefs, 32, 0);
                     if (ast_codec_pref_index(&iaxs[fr->callno]->rprefs, 0)) {
                        /* If we are codec_first_choice we let the caller have the 1st shot at picking the codec.*/
                        if (ast_test_flag(iaxs[fr->callno], IAX_CODEC_USER_FIRST)) {
                           pref = iaxs[fr->callno]->rprefs;
                           using_prefs = "caller";
                        } else {
                           pref = iaxs[fr->callno]->prefs;
                        }
                     } else
                        pref = iaxs[fr->callno]->prefs;
                     
                     format = ast_codec_choose(&pref, iaxs[fr->callno]->capability & iaxs[fr->callno]->peercapability, 0);
                     ast_codec_pref_string(&iaxs[fr->callno]->rprefs, caller_pref_buf, sizeof(caller_pref_buf) - 1);
                     ast_codec_pref_string(&iaxs[fr->callno]->prefs, host_pref_buf, sizeof(host_pref_buf) - 1);
                  }
                  if (!format) {
                     if(!ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP))
                        format = iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability;
                     if (!format) {
                        memset(&ied0, 0, sizeof(ied0));
                        iax_ie_append_str(&ied0, IAX_IE_CAUSE, "Unable to negotiate codec");
                        iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
                        send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
                        if (!iaxs[fr->callno]) {
                           ast_mutex_unlock(&iaxsl[fr->callno]);
                           return 1;
                        }
                        if (authdebug) {
                           if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP))
                              ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested 0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->capability);
                           else 
                              ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested/capability 0x%x/0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->peercapability, iaxs[fr->callno]->capability);
                        }
                     } else {
                        /* Pick one... */
                        if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP)) {
                           if(!(iaxs[fr->callno]->peerformat & iaxs[fr->callno]->capability))
                              format = 0;
                        } else {
                           if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOPREFS)) {
                              using_prefs = ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP) ? "reqonly" : "disabled";
                              memset(&pref, 0, sizeof(pref));
                              format = ast_best_codec(iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability);
                              strcpy(caller_pref_buf,"disabled");
                              strcpy(host_pref_buf,"disabled");
                           } else {
                              using_prefs = "mine";
                              if (ast_codec_pref_index(&iaxs[fr->callno]->rprefs, 0)) {
                                 /* Do the opposite of what we tried above. */
                                 if (ast_test_flag(iaxs[fr->callno], IAX_CODEC_USER_FIRST)) {
                                    pref = iaxs[fr->callno]->prefs;                       
                                 } else {
                                    pref = iaxs[fr->callno]->rprefs;
                                    using_prefs = "caller";
                                 }
                                 format = ast_codec_choose(&pref, iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability, 1);
                           
                              } else /* if no codec_prefs IE do it the old way */
                                 format = ast_best_codec(iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability); 
                           }
                        }

                        if (!format) {
                           memset(&ied0, 0, sizeof(ied0));
                           iax_ie_append_str(&ied0, IAX_IE_CAUSE, "Unable to negotiate codec");
                           iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
                           ast_log(LOG_ERROR, "No best format in 0x%x???\n", iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability);
                           send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
                           if (!iaxs[fr->callno]) {
                              ast_mutex_unlock(&iaxsl[fr->callno]);
                              return 1;
                           }
                           if (authdebug)
                              ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested/capability 0x%x/0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->peercapability, iaxs[fr->callno]->capability);
                           ast_set_flag(iaxs[fr->callno], IAX_ALREADYGONE);   
                           break;
                        }
                     }
                  }
                  if (format) {
                     /* No authentication required, let them in */
                     memset(&ied1, 0, sizeof(ied1));
                     iax_ie_append_int(&ied1, IAX_IE_FORMAT, format);
                     send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACCEPT, 0, ied1.buf, ied1.pos, -1);
                     if (strcmp(iaxs[fr->callno]->exten, "TBD")) {
                        ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
                        if (option_verbose > 2) 
                           ast_verbose(VERBOSE_PREFIX_3 "Accepting UNAUTHENTICATED call from %s:\n"
                                    "%srequested format = %s,\n"
                                    "%srequested prefs = %s,\n"
                                    "%sactual format = %s,\n"
                                    "%shost prefs = %s,\n"
                                    "%spriority = %s\n",
                                    ast_inet_ntoa(sin.sin_addr), 
                                    VERBOSE_PREFIX_4,
                                    ast_getformatname(iaxs[fr->callno]->peerformat), 
                                    VERBOSE_PREFIX_4,
                                    caller_pref_buf,
                                    VERBOSE_PREFIX_4,
                                    ast_getformatname(format), 
                                    VERBOSE_PREFIX_4,
                                    host_pref_buf, 
                                    VERBOSE_PREFIX_4,
                                    using_prefs);
                        
                        iaxs[fr->callno]->chosenformat = format;
                        ast_set_flag(iaxs[fr->callno], IAX_DELAYPBXSTART);
                     } else {
                        ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
                        /* If this is a TBD call, we're ready but now what...  */
                        if (option_verbose > 2)
                           ast_verbose(VERBOSE_PREFIX_3 "Accepted unauthenticated TBD call from %s\n", ast_inet_ntoa(sin.sin_addr));
                     }
                  }
               }
               break;
            }
            if (iaxs[fr->callno]->authmethods & IAX_AUTH_MD5)
               merge_encryption(iaxs[fr->callno],ies.encmethods);
            else
               iaxs[fr->callno]->encmethods = 0;
            if (!authenticate_request(fr->callno) && iaxs[fr->callno])
               ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_AUTHENTICATED);
            if (!iaxs[fr->callno]) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            break;
         case IAX_COMMAND_DPREQ:
            /* Request status in the dialplan */
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD) &&
               !ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED) && ies.called_number) {
               if (iaxcompat) {
                  /* Spawn a thread for the lookup */
                  spawn_dp_lookup(fr->callno, iaxs[fr->callno]->context, ies.called_number, iaxs[fr->callno]->cid_num);
               } else {
                  /* Just look it up */
                  dp_lookup(fr->callno, iaxs[fr->callno]->context, ies.called_number, iaxs[fr->callno]->cid_num, 1);
               }
            }
            break;
         case IAX_COMMAND_HANGUP:
            ast_set_flag(iaxs[fr->callno], IAX_ALREADYGONE);
            if (option_debug)
               ast_log(LOG_DEBUG, "Immediately destroying %d, having received hangup\n", fr->callno);
            /* Set hangup cause according to remote */
            if (ies.causecode && iaxs[fr->callno]->owner)
               iaxs[fr->callno]->owner->hangupcause = ies.causecode;
            /* Send ack immediately, before we destroy */
            send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            iax2_destroy(fr->callno);
            break;
         case IAX_COMMAND_REJECT:
            /* Set hangup cause according to remote */
            if (ies.causecode && iaxs[fr->callno]->owner)
               iaxs[fr->callno]->owner->hangupcause = ies.causecode;

            if (!ast_test_flag(iaxs[fr->callno], IAX_PROVISION)) {
               if (iaxs[fr->callno]->owner && authdebug)
                  ast_log(LOG_WARNING, "Call rejected by %s: %s\n",
                     ast_inet_ntoa(iaxs[fr->callno]->addr.sin_addr),
                     ies.cause ? ies.cause : "<Unknown>");
               if (option_debug)
                  ast_log(LOG_DEBUG, "Immediately destroying %d, having received reject\n",
                     fr->callno);
            }
            /* Send ack immediately, before we destroy */
            send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK,
                         fr->ts, NULL, 0, fr->iseqno);
            if (!ast_test_flag(iaxs[fr->callno], IAX_PROVISION))
               iaxs[fr->callno]->error = EPERM;
            iax2_destroy(fr->callno);
            break;
         case IAX_COMMAND_TRANSFER:
         {
            struct ast_channel *bridged_chan;

            if (iaxs[fr->callno]->owner && (bridged_chan = ast_bridged_channel(iaxs[fr->callno]->owner)) && ies.called_number) {
               /* Set BLINDTRANSFER channel variables */

               ast_mutex_unlock(&iaxsl[fr->callno]);
               pbx_builtin_setvar_helper(iaxs[fr->callno]->owner, "BLINDTRANSFER", bridged_chan->name);
               ast_mutex_lock(&iaxsl[fr->callno]);
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }

               pbx_builtin_setvar_helper(bridged_chan, "BLINDTRANSFER", iaxs[fr->callno]->owner->name);
               if (!strcmp(ies.called_number, ast_parking_ext())) {
                  if (iax_park(bridged_chan, iaxs[fr->callno]->owner)) {
                     ast_log(LOG_WARNING, "Failed to park call on '%s'\n", bridged_chan->name);
                  } else {
                     ast_log(LOG_DEBUG, "Parked call on '%s'\n", bridged_chan->name);
                  }
               } else {
                  if (ast_async_goto(bridged_chan, iaxs[fr->callno]->context, ies.called_number, 1))
                     ast_log(LOG_WARNING, "Async goto of '%s' to '%s@%s' failed\n", bridged_chan->name, 
                        ies.called_number, iaxs[fr->callno]->context);
                  else
                     ast_log(LOG_DEBUG, "Async goto of '%s' to '%s@%s' started\n", bridged_chan->name, 
                        ies.called_number, iaxs[fr->callno]->context);
               }
            } else
                  ast_log(LOG_DEBUG, "Async goto not applicable on call %d\n", fr->callno);

            break;
         }
         case IAX_COMMAND_ACCEPT:
            /* Ignore if call is already up or needs authentication or is a TBD */
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED | IAX_STATE_TBD | IAX_STATE_AUTHENTICATED))
               break;
            if (ast_test_flag(iaxs[fr->callno], IAX_PROVISION)) {
               /* Send ack immediately, before we destroy */
               send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
               iax2_destroy(fr->callno);
               break;
            }
            if (ies.format) {
               iaxs[fr->callno]->peerformat = ies.format;
            } else {
               if (iaxs[fr->callno]->owner)
                  iaxs[fr->callno]->peerformat = iaxs[fr->callno]->owner->nativeformats;
               else
                  iaxs[fr->callno]->peerformat = iaxs[fr->callno]->capability;
            }
            if (option_verbose > 2)
               ast_verbose(VERBOSE_PREFIX_3 "Call accepted by %s (format %s)\n", ast_inet_ntoa(iaxs[fr->callno]->addr.sin_addr), ast_getformatname(iaxs[fr->callno]->peerformat));
            if (!(iaxs[fr->callno]->peerformat & iaxs[fr->callno]->capability)) {
               memset(&ied0, 0, sizeof(ied0));
               iax_ie_append_str(&ied0, IAX_IE_CAUSE, "Unable to negotiate codec");
               iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
               send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
               if (authdebug)
                  ast_log(LOG_NOTICE, "Rejected call to %s, format 0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->capability);
            } else {
               ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
               if (iaxs[fr->callno]->owner) {
                  /* Switch us to use a compatible format */
                  iaxs[fr->callno]->owner->nativeformats = iaxs[fr->callno]->peerformat;
                  if (option_verbose > 2)
                     ast_verbose(VERBOSE_PREFIX_3 "Format for call is %s\n", ast_getformatname(iaxs[fr->callno]->owner->nativeformats));
retryowner2:
                  if (ast_mutex_trylock(&iaxs[fr->callno]->owner->lock)) {
                     DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
                     if (iaxs[fr->callno] && iaxs[fr->callno]->owner) goto retryowner2;
                  }
                  
                  if (iaxs[fr->callno] && iaxs[fr->callno]->owner) {
                     /* Setup read/write formats properly. */
                     if (iaxs[fr->callno]->owner->writeformat)
                        ast_set_write_format(iaxs[fr->callno]->owner, iaxs[fr->callno]->owner->writeformat);   
                     if (iaxs[fr->callno]->owner->readformat)
                        ast_set_read_format(iaxs[fr->callno]->owner, iaxs[fr->callno]->owner->readformat);  
                     ast_mutex_unlock(&iaxs[fr->callno]->owner->lock);
                  }
               }
            }
            if (iaxs[fr->callno]) {
               ast_mutex_lock(&dpcache_lock);
               dp = iaxs[fr->callno]->dpentries;
               while(dp) {
                  if (!(dp->flags & CACHE_FLAG_TRANSMITTED)) {
                     iax2_dprequest(dp, fr->callno);
                  }
                  dp = dp->peer;
               }
               ast_mutex_unlock(&dpcache_lock);
            }
            break;
         case IAX_COMMAND_POKE:
            /* Send back a pong packet with the original timestamp */
            send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_PONG, fr->ts, NULL, 0, -1);
            if (!iaxs[fr->callno]) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            break;
         case IAX_COMMAND_PING:
         {
            struct iax_ie_data pingied;
            construct_rr(iaxs[fr->callno], &pingied);
            /* Send back a pong packet with the original timestamp */
            send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_PONG, fr->ts, pingied.buf, pingied.pos, -1);
         }
            break;
         case IAX_COMMAND_PONG:
            /* Calculate ping time */
            iaxs[fr->callno]->pingtime =  calc_timestamp(iaxs[fr->callno], 0, &f) - fr->ts;
            /* save RR info */
            save_rr(fr, &ies);

            if (iaxs[fr->callno]->peerpoke) {
               peer = iaxs[fr->callno]->peerpoke;
               if ((peer->lastms < 0)  || (peer->historicms > peer->maxms)) {
                  if (iaxs[fr->callno]->pingtime <= peer->maxms) {
                     ast_log(LOG_NOTICE, "Peer '%s' is now REACHABLE! Time: %d\n", peer->name, iaxs[fr->callno]->pingtime);
                     manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Reachable\r\nTime: %d\r\n", peer->name, iaxs[fr->callno]->pingtime); 
                     ast_device_state_changed("IAX2/%s", peer->name); /* Activate notification */
                  }
               } else if ((peer->historicms > 0) && (peer->historicms <= peer->maxms)) {
                  if (iaxs[fr->callno]->pingtime > peer->maxms) {
                     ast_log(LOG_NOTICE, "Peer '%s' is now TOO LAGGED (%d ms)!\n", peer->name, iaxs[fr->callno]->pingtime);
                     manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Lagged\r\nTime: %d\r\n", peer->name, iaxs[fr->callno]->pingtime); 
                     ast_device_state_changed("IAX2/%s", peer->name); /* Activate notification */
                  }
               }
               peer->lastms = iaxs[fr->callno]->pingtime;
               if (peer->smoothing && (peer->lastms > -1))
                  peer->historicms = (iaxs[fr->callno]->pingtime + peer->historicms) / 2;
               else if (peer->smoothing && peer->lastms < 0)
                  peer->historicms = (0 + peer->historicms) / 2;
               else              
                  peer->historicms = iaxs[fr->callno]->pingtime;

               /* Remove scheduled iax2_poke_noanswer */
               if (peer->pokeexpire > -1) {
                  if (!ast_sched_del(sched, peer->pokeexpire)) {
                     peer_unref(peer);
                     peer->pokeexpire = -1;
                  }
               }
               /* Schedule the next cycle */
               if ((peer->lastms < 0)  || (peer->historicms > peer->maxms)) 
                  peer->pokeexpire = iax2_sched_add(sched, peer->pokefreqnotok, iax2_poke_peer_s, peer_ref(peer));
               else
                  peer->pokeexpire = iax2_sched_add(sched, peer->pokefreqok, iax2_poke_peer_s, peer_ref(peer));
               if (peer->pokeexpire == -1)
                  peer_unref(peer);
               /* and finally send the ack */
               send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
               /* And wrap up the qualify call */
               iax2_destroy(fr->callno);
               peer->callno = 0;
               if (option_debug)
                  ast_log(LOG_DEBUG, "Peer %s: got pong, lastms %d, historicms %d, maxms %d\n", peer->name, peer->lastms, peer->historicms, peer->maxms);
            }
            break;
         case IAX_COMMAND_LAGRQ:
         case IAX_COMMAND_LAGRP:
            f.src = "LAGRQ";
            f.mallocd = 0;
            f.offset = 0;
            f.samples = 0;
            iax_frame_wrap(fr, &f);
            if(f.subclass == IAX_COMMAND_LAGRQ) {
               /* Received a LAGRQ - echo back a LAGRP */
               fr->af.subclass = IAX_COMMAND_LAGRP;
               iax2_send(iaxs[fr->callno], &fr->af, fr->ts, -1, 0, 0, 0);
            } else {
               /* Received LAGRP in response to our LAGRQ */
               unsigned int ts;
               /* This is a reply we've been given, actually measure the difference */
               ts = calc_timestamp(iaxs[fr->callno], 0, &fr->af);
               iaxs[fr->callno]->lag = ts - fr->ts;
               if (option_debug && iaxdebug)
                  ast_log(LOG_DEBUG, "Peer %s lag measured as %dms\n",
                     ast_inet_ntoa(iaxs[fr->callno]->addr.sin_addr), iaxs[fr->callno]->lag);
            }
            break;
         case IAX_COMMAND_AUTHREQ:
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED | IAX_STATE_TBD)) {
               ast_log(LOG_WARNING, "Call on %s is already up, can't start on it\n", iaxs[fr->callno]->owner ? iaxs[fr->callno]->owner->name : "<Unknown>");
               break;
            }
            if (authenticate_reply(iaxs[fr->callno], &iaxs[fr->callno]->addr, &ies, iaxs[fr->callno]->secret, iaxs[fr->callno]->outkey)) {
               struct ast_frame hangup_fr = { .frametype = AST_FRAME_CONTROL,
                        .subclass = AST_CONTROL_HANGUP,
               };
               ast_log(LOG_WARNING, 
                  "I don't know how to authenticate %s to %s\n", 
                  ies.username ? ies.username : "<unknown>", ast_inet_ntoa(iaxs[fr->callno]->addr.sin_addr));
               iax2_queue_frame(fr->callno, &hangup_fr);
            }
            if (!iaxs[fr->callno]) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            break;
         case IAX_COMMAND_AUTHREP:
            /* For security, always ack immediately */
            if (delayreject)
               send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            /* Ignore once we've started */
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED | IAX_STATE_TBD)) {
               ast_log(LOG_WARNING, "Call on %s is already up, can't start on it\n", iaxs[fr->callno]->owner ? iaxs[fr->callno]->owner->name : "<Unknown>");
               break;
            }
            if (authenticate_verify(iaxs[fr->callno], &ies)) {
               if (authdebug)
                  ast_log(LOG_NOTICE, "Host %s failed to authenticate as %s\n", ast_inet_ntoa(iaxs[fr->callno]->addr.sin_addr), iaxs[fr->callno]->username);
               memset(&ied0, 0, sizeof(ied0));
               auth_fail(fr->callno, IAX_COMMAND_REJECT);
               break;
            }
            if (strcasecmp(iaxs[fr->callno]->exten, "TBD")) {
               /* This might re-enter the IAX code and need the lock */
               exists = ast_exists_extension(NULL, iaxs[fr->callno]->context, iaxs[fr->callno]->exten, 1, iaxs[fr->callno]->cid_num);
            } else
               exists = 0;
            if (strcmp(iaxs[fr->callno]->exten, "TBD") && !exists) {
               if (authdebug)
                  ast_log(LOG_NOTICE, "Rejected connect attempt from %s, request '%s@%s' does not exist\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->exten, iaxs[fr->callno]->context);
               memset(&ied0, 0, sizeof(ied0));
               iax_ie_append_str(&ied0, IAX_IE_CAUSE, "No such context/extension");
               iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_NO_ROUTE_DESTINATION);
               send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
            } else {
               /* Select an appropriate format */
               if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOPREFS)) {
                  if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP)) {
                     using_prefs = "reqonly";
                  } else {
                     using_prefs = "disabled";
                  }
                  format = iaxs[fr->callno]->peerformat & iaxs[fr->callno]->capability;
                  memset(&pref, 0, sizeof(pref));
                  strcpy(caller_pref_buf, "disabled");
                  strcpy(host_pref_buf, "disabled");
               } else {
                  using_prefs = "mine";
                  if (ies.codec_prefs)
                     ast_codec_pref_convert(&iaxs[fr->callno]->rprefs, ies.codec_prefs, 32, 0);
                  if (ast_codec_pref_index(&iaxs[fr->callno]->rprefs, 0)) {
                     if (ast_test_flag(iaxs[fr->callno], IAX_CODEC_USER_FIRST)) {
                        pref = iaxs[fr->callno]->rprefs;
                        using_prefs = "caller";
                     } else {
                        pref = iaxs[fr->callno]->prefs;
                     }
                  } else /* if no codec_prefs IE do it the old way */
                     pref = iaxs[fr->callno]->prefs;
               
                  format = ast_codec_choose(&pref, iaxs[fr->callno]->capability & iaxs[fr->callno]->peercapability, 0);
                  ast_codec_pref_string(&iaxs[fr->callno]->rprefs, caller_pref_buf, sizeof(caller_pref_buf) - 1);
                  ast_codec_pref_string(&iaxs[fr->callno]->prefs, host_pref_buf, sizeof(host_pref_buf) - 1);
               }
               if (!format) {
                  if(!ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP)) {
                     if (option_debug)
                        ast_log(LOG_DEBUG, "We don't do requested format %s, falling back to peer capability %d\n", ast_getformatname(iaxs[fr->callno]->peerformat), iaxs[fr->callno]->peercapability);
                     format = iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability;
                  }
                  if (!format) {
                     if (authdebug) {
                        if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP)) 
                           ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested 0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->capability);
                        else
                           ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested/capability 0x%x/0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->peercapability, iaxs[fr->callno]->capability);
                     }
                     memset(&ied0, 0, sizeof(ied0));
                     iax_ie_append_str(&ied0, IAX_IE_CAUSE, "Unable to negotiate codec");
                     iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
                     send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
                     if (!iaxs[fr->callno]) {
                        ast_mutex_unlock(&iaxsl[fr->callno]);
                        return 1;
                     }
                  } else {
                     /* Pick one... */
                     if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP)) {
                        if(!(iaxs[fr->callno]->peerformat & iaxs[fr->callno]->capability))
                           format = 0;
                     } else {
                        if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOPREFS)) {
                           using_prefs = ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP) ? "reqonly" : "disabled";
                           memset(&pref, 0, sizeof(pref));
                           format = ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP) ?
                              iaxs[fr->callno]->peerformat : ast_best_codec(iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability);
                           strcpy(caller_pref_buf,"disabled");
                           strcpy(host_pref_buf,"disabled");
                        } else {
                           using_prefs = "mine";
                           if (ast_codec_pref_index(&iaxs[fr->callno]->rprefs, 0)) {
                              /* Do the opposite of what we tried above. */
                              if (ast_test_flag(iaxs[fr->callno], IAX_CODEC_USER_FIRST)) {
                                 pref = iaxs[fr->callno]->prefs;                 
                              } else {
                                 pref = iaxs[fr->callno]->rprefs;
                                 using_prefs = "caller";
                              }
                              format = ast_codec_choose(&pref, iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability, 1);
                           } else /* if no codec_prefs IE do it the old way */
                              format = ast_best_codec(iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability); 
                        }
                     }
                     if (!format) {
                        ast_log(LOG_ERROR, "No best format in 0x%x???\n", iaxs[fr->callno]->peercapability & iaxs[fr->callno]->capability);
                        if (authdebug) {
                           if(ast_test_flag(iaxs[fr->callno], IAX_CODEC_NOCAP))
                              ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested 0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->capability);
                           else
                              ast_log(LOG_NOTICE, "Rejected connect attempt from %s, requested/capability 0x%x/0x%x incompatible with our capability 0x%x.\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat, iaxs[fr->callno]->peercapability, iaxs[fr->callno]->capability);
                        }
                        memset(&ied0, 0, sizeof(ied0));
                        iax_ie_append_str(&ied0, IAX_IE_CAUSE, "Unable to negotiate codec");
                        iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
                        send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
                        if (!iaxs[fr->callno]) {
                           ast_mutex_unlock(&iaxsl[fr->callno]);
                           return 1;
                        }
                     }
                  }
               }
               if (format) {
                  /* Authentication received */
                  memset(&ied1, 0, sizeof(ied1));
                  iax_ie_append_int(&ied1, IAX_IE_FORMAT, format);
                  send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACCEPT, 0, ied1.buf, ied1.pos, -1);
                  if (strcmp(iaxs[fr->callno]->exten, "TBD")) {
                     ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
                     if (option_verbose > 2) 
                        ast_verbose(VERBOSE_PREFIX_3 "Accepting AUTHENTICATED call from %s:\n"
                                 "%srequested format = %s,\n"
                                 "%srequested prefs = %s,\n"
                                 "%sactual format = %s,\n"
                                 "%shost prefs = %s,\n"
                                 "%spriority = %s\n", 
                                 ast_inet_ntoa(sin.sin_addr), 
                                 VERBOSE_PREFIX_4,
                                 ast_getformatname(iaxs[fr->callno]->peerformat),
                                 VERBOSE_PREFIX_4,
                                 caller_pref_buf,
                                 VERBOSE_PREFIX_4,
                                 ast_getformatname(format),
                                 VERBOSE_PREFIX_4,
                                 host_pref_buf,
                                 VERBOSE_PREFIX_4,
                                 using_prefs);

                     ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
                     if(!(c = ast_iax2_new(fr->callno, AST_STATE_RING, format)))
                        iax2_destroy(fr->callno);
                  } else {
                     ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
                     /* If this is a TBD call, we're ready but now what...  */
                     if (option_verbose > 2)
                        ast_verbose(VERBOSE_PREFIX_3 "Accepted AUTHENTICATED TBD call from %s\n", ast_inet_ntoa(sin.sin_addr));
                  }
               }
            }
            break;
         case IAX_COMMAND_DIAL:
            if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD)) {
               ast_clear_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
               ast_string_field_set(iaxs[fr->callno], exten, ies.called_number ? ies.called_number : "s");
               if (!ast_exists_extension(NULL, iaxs[fr->callno]->context, iaxs[fr->callno]->exten, 1, iaxs[fr->callno]->cid_num)) {
                  if (authdebug)
                     ast_log(LOG_NOTICE, "Rejected dial attempt from %s, request '%s@%s' does not exist\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->exten, iaxs[fr->callno]->context);
                  memset(&ied0, 0, sizeof(ied0));
                  iax_ie_append_str(&ied0, IAX_IE_CAUSE, "No such context/extension");
                  iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_NO_ROUTE_DESTINATION);
                  send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
                  if (!iaxs[fr->callno]) {
                     ast_mutex_unlock(&iaxsl[fr->callno]);
                     return 1;
                  }
               } else {
                  ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
                  if (option_verbose > 2) 
                     ast_verbose(VERBOSE_PREFIX_3 "Accepting DIAL from %s, formats = 0x%x\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat);
                  ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
                  send_command(iaxs[fr->callno], AST_FRAME_CONTROL, AST_CONTROL_PROGRESS, 0, NULL, 0, -1);
                  if(!(c = ast_iax2_new(fr->callno, AST_STATE_RING, iaxs[fr->callno]->peerformat)))
                     iax2_destroy(fr->callno);
               }
            }
            break;
         case IAX_COMMAND_INVAL:
            iaxs[fr->callno]->error = ENOTCONN;
            if (option_debug)
               ast_log(LOG_DEBUG, "Immediately destroying %d, having received INVAL\n", fr->callno);
            iax2_destroy(fr->callno);
            if (option_debug)
               ast_log(LOG_DEBUG, "Destroying call %d\n", fr->callno);
            break;
         case IAX_COMMAND_VNAK:
            if (option_debug)
               ast_log(LOG_DEBUG, "Received VNAK: resending outstanding frames\n");
            /* Force retransmission */
            vnak_retransmit(fr->callno, fr->iseqno);
            break;
         case IAX_COMMAND_REGREQ:
         case IAX_COMMAND_REGREL:
            /* For security, always ack immediately */
            if (delayreject)
               send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            if (register_verify(fr->callno, &sin, &ies)) {
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
               /* Send delayed failure */
               auth_fail(fr->callno, IAX_COMMAND_REGREJ);
               break;
            }
            if (!iaxs[fr->callno]) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            if ((ast_strlen_zero(iaxs[fr->callno]->secret) && ast_strlen_zero(iaxs[fr->callno]->inkeys)) || 
                  ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_AUTHENTICATED | IAX_STATE_UNCHANGED)) {
               if (f.subclass == IAX_COMMAND_REGREL)
                  memset(&sin, 0, sizeof(sin));
               if (update_registry(&sin, fr->callno, ies.devicetype, fd, ies.refresh))
                  ast_log(LOG_WARNING, "Registry error\n");
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
               if (ies.provverpres && ies.serviceident && sin.sin_addr.s_addr) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  check_provisioning(&sin, fd, ies.serviceident, ies.provver);
                  ast_mutex_lock(&iaxsl[fr->callno]);
                  if (!iaxs[fr->callno]) {
                     ast_mutex_unlock(&iaxsl[fr->callno]);
                     return 1;
                  }
               }
               break;
            }
            registry_authrequest(fr->callno);
            if (!iaxs[fr->callno]) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            break;
         case IAX_COMMAND_REGACK:
            if (iax2_ack_registry(&ies, &sin, fr->callno)) 
               ast_log(LOG_WARNING, "Registration failure\n");
            /* Send ack immediately, before we destroy */
            send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            iax2_destroy(fr->callno);
            break;
         case IAX_COMMAND_REGREJ:
            if (iaxs[fr->callno]->reg) {
               if (authdebug) {
                  ast_log(LOG_NOTICE, "Registration of '%s' rejected: '%s' from: '%s'\n", iaxs[fr->callno]->reg->username, ies.cause ? ies.cause : "<unknown>", ast_inet_ntoa(sin.sin_addr));
                  manager_event(EVENT_FLAG_SYSTEM, "Registry", "ChannelDriver: IAX2\r\nUsername: %s\r\nStatus: Rejected\r\nCause: %s\r\n", iaxs[fr->callno]->reg->username, ies.cause ? ies.cause : "<unknown>");
               }
               iaxs[fr->callno]->reg->regstate = REG_STATE_REJECTED;
            }
            /* Send ack immediately, before we destroy */
            send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            iax2_destroy(fr->callno);
            break;
         case IAX_COMMAND_REGAUTH:
            /* Authentication request */
            if (registry_rerequest(&ies, fr->callno, &sin)) {
               memset(&ied0, 0, sizeof(ied0));
               iax_ie_append_str(&ied0, IAX_IE_CAUSE, "No authority found");
               iax_ie_append_byte(&ied0, IAX_IE_CAUSECODE, AST_CAUSE_FACILITY_NOT_SUBSCRIBED);
               send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
               if (!iaxs[fr->callno]) {
                  ast_mutex_unlock(&iaxsl[fr->callno]);
                  return 1;
               }
            }
            break;
         case IAX_COMMAND_TXREJ:
            iaxs[fr->callno]->transferring = 0;
            if (option_verbose > 2) 
               ast_verbose(VERBOSE_PREFIX_3 "Channel '%s' unable to transfer\n", iaxs[fr->callno]->owner ? iaxs[fr->callno]->owner->name : "<Unknown>");
            memset(&iaxs[fr->callno]->transfer, 0, sizeof(iaxs[fr->callno]->transfer));
            if (iaxs[fr->callno]->bridgecallno) {
               if (iaxs[iaxs[fr->callno]->bridgecallno]->transferring) {
                  iaxs[iaxs[fr->callno]->bridgecallno]->transferring = 0;
                  send_command(iaxs[iaxs[fr->callno]->bridgecallno], AST_FRAME_IAX, IAX_COMMAND_TXREJ, 0, NULL, 0, -1);
               }
            }
            break;
         case IAX_COMMAND_TXREADY:
            if ((iaxs[fr->callno]->transferring == TRANSFER_BEGIN) ||
                (iaxs[fr->callno]->transferring == TRANSFER_MBEGIN)) {
               if (iaxs[fr->callno]->transferring == TRANSFER_MBEGIN)
                  iaxs[fr->callno]->transferring = TRANSFER_MREADY;
               else
                  iaxs[fr->callno]->transferring = TRANSFER_READY;
               if (option_verbose > 2) 
                  ast_verbose(VERBOSE_PREFIX_3 "Channel '%s' ready to transfer\n", iaxs[fr->callno]->owner ? iaxs[fr->callno]->owner->name : "<Unknown>");
               if (iaxs[fr->callno]->bridgecallno) {
                  if ((iaxs[iaxs[fr->callno]->bridgecallno]->transferring == TRANSFER_READY) ||
                      (iaxs[iaxs[fr->callno]->bridgecallno]->transferring == TRANSFER_MREADY)) {
                     /* They're both ready, now release them. */
                     if (iaxs[fr->callno]->transferring == TRANSFER_MREADY) {
                        if (option_verbose > 2) 
                           ast_verbose(VERBOSE_PREFIX_3 "Attempting media bridge of %s and %s\n", iaxs[fr->callno]->owner ? iaxs[fr->callno]->owner->name : "<Unknown>",
                              iaxs[iaxs[fr->callno]->bridgecallno]->owner ? iaxs[iaxs[fr->callno]->bridgecallno]->owner->name : "<Unknown>");

                        iaxs[iaxs[fr->callno]->bridgecallno]->transferring = TRANSFER_MEDIA;
                        iaxs[fr->callno]->transferring = TRANSFER_MEDIA;

                        memset(&ied0, 0, sizeof(ied0));
                        memset(&ied1, 0, sizeof(ied1));
                        iax_ie_append_short(&ied0, IAX_IE_CALLNO, iaxs[iaxs[fr->callno]->bridgecallno]->peercallno);
                        iax_ie_append_short(&ied1, IAX_IE_CALLNO, iaxs[fr->callno]->peercallno);
                        send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_TXMEDIA, 0, ied0.buf, ied0.pos, -1);
                        send_command(iaxs[iaxs[fr->callno]->bridgecallno], AST_FRAME_IAX, IAX_COMMAND_TXMEDIA, 0, ied1.buf, ied1.pos, -1);
                     } else {
                        if (option_verbose > 2) 
                           ast_verbose(VERBOSE_PREFIX_3 "Releasing %s and %s\n", iaxs[fr->callno]->owner ? iaxs[fr->callno]->owner->name : "<Unknown>",
                              iaxs[iaxs[fr->callno]->bridgecallno]->owner ? iaxs[iaxs[fr->callno]->bridgecallno]->owner->name : "<Unknown>");

                        iaxs[iaxs[fr->callno]->bridgecallno]->transferring = TRANSFER_RELEASED;
                        iaxs[fr->callno]->transferring = TRANSFER_RELEASED;
                        ast_set_flag(iaxs[iaxs[fr->callno]->bridgecallno], IAX_ALREADYGONE);
                        ast_set_flag(iaxs[fr->callno], IAX_ALREADYGONE);

                        /* Stop doing lag & ping requests */
                        stop_stuff(fr->callno);
                        stop_stuff(iaxs[fr->callno]->bridgecallno);

                        memset(&ied0, 0, sizeof(ied0));
                        memset(&ied1, 0, sizeof(ied1));
                        iax_ie_append_short(&ied0, IAX_IE_CALLNO, iaxs[iaxs[fr->callno]->bridgecallno]->peercallno);
                        iax_ie_append_short(&ied1, IAX_IE_CALLNO, iaxs[fr->callno]->peercallno);
                        send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_TXREL, 0, ied0.buf, ied0.pos, -1);
                        send_command(iaxs[iaxs[fr->callno]->bridgecallno], AST_FRAME_IAX, IAX_COMMAND_TXREL, 0, ied1.buf, ied1.pos, -1);
                     }

                  }
               }
            }
            break;
         case IAX_COMMAND_TXREQ:
            try_transfer(iaxs[fr->callno], &ies);
            break;
         case IAX_COMMAND_TXCNT:
            if (iaxs[fr->callno]->transferring)
               send_command_transfer(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_TXACC, 0, NULL, 0);
            break;
         case IAX_COMMAND_TXREL:
            /* Send ack immediately, rather than waiting until we've changed addresses */
            send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
            complete_transfer(fr->callno, &ies);
            stop_stuff(fr->callno); /* for attended transfer to work with libiax */
            break;   
         case IAX_COMMAND_TXMEDIA:
            if (iaxs[fr->callno]->transferring == TRANSFER_READY) {
                                        AST_LIST_LOCK(&iaxq.queue);
                                        AST_LIST_TRAVERSE(&iaxq.queue, cur, list) {
                                                /* Cancel any outstanding frames and start anew */
                                                if ((fr->callno == cur->callno) && (cur->transfer)) {
                                                        cur->retries = -1;
                                                }
                                        }
                                        AST_LIST_UNLOCK(&iaxq.queue);
               /* Start sending our media to the transfer address, but otherwise leave the call as-is */
               iaxs[fr->callno]->transferring = TRANSFER_MEDIAPASS;
            }
            break;   
         case IAX_COMMAND_DPREP:
            complete_dpreply(iaxs[fr->callno], &ies);
            break;
         case IAX_COMMAND_UNSUPPORT:
            ast_log(LOG_NOTICE, "Peer did not understand our iax command '%d'\n", ies.iax_unknown);
            break;
         case IAX_COMMAND_FWDOWNL:
            /* Firmware download */
            if (!ast_test_flag(&globalflags, IAX_ALLOWFWDOWNLOAD)) {
               send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_UNSUPPORT, 0, NULL, 0, -1);
               break;
            }
            memset(&ied0, 0, sizeof(ied0));
            res = iax_firmware_append(&ied0, (unsigned char *)ies.devicetype, ies.fwdesc);
            if (res < 0)
               send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_REJECT, 0, ied0.buf, ied0.pos, -1);
            else if (res > 0)
               send_command_final(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_FWDATA, 0, ied0.buf, ied0.pos, -1);
            else
               send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_FWDATA, 0, ied0.buf, ied0.pos, -1);
            if (!iaxs[fr->callno]) {
               ast_mutex_unlock(&iaxsl[fr->callno]);
               return 1;
            }
            break;
         default:
            if (option_debug)
               ast_log(LOG_DEBUG, "Unknown IAX command %d on %d/%d\n", f.subclass, fr->callno, iaxs[fr->callno]->peercallno);
            memset(&ied0, 0, sizeof(ied0));
            iax_ie_append_byte(&ied0, IAX_IE_IAX_UNKNOWN, f.subclass);
            send_command(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_UNSUPPORT, 0, ied0.buf, ied0.pos, -1);
         }
         /* Don't actually pass these frames along */
         if ((f.subclass != IAX_COMMAND_ACK) && 
           (f.subclass != IAX_COMMAND_TXCNT) && 
           (f.subclass != IAX_COMMAND_TXACC) && 
           (f.subclass != IAX_COMMAND_INVAL) &&
           (f.subclass != IAX_COMMAND_VNAK)) { 
            if (iaxs[fr->callno] && iaxs[fr->callno]->aseqno != iaxs[fr->callno]->iseqno)
               send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
         }
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }
      /* Unless this is an ACK or INVAL frame, ack it */
      if (iaxs[fr->callno] && iaxs[fr->callno]->aseqno != iaxs[fr->callno]->iseqno)
         send_command_immediate(iaxs[fr->callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr->ts, NULL, 0,fr->iseqno);
   } else if (minivid) {
      f.frametype = AST_FRAME_VIDEO;
      if (iaxs[fr->callno]->videoformat > 0) 
         f.subclass = iaxs[fr->callno]->videoformat | (ntohs(vh->ts) & 0x8000 ? 1 : 0);
      else {
         ast_log(LOG_WARNING, "Received mini frame before first full video frame\n ");
         iax2_vnak(fr->callno);
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }
      f.datalen = res - sizeof(*vh);
      if (f.datalen)
         f.data = thread->buf + sizeof(*vh);
      else
         f.data = NULL;
#ifdef IAXTESTS
      if (test_resync) {
         fr->ts = (iaxs[fr->callno]->last & 0xFFFF8000L) | ((ntohs(vh->ts) + test_resync) & 0x7fff);
      } else
#endif /* IAXTESTS */
         fr->ts = (iaxs[fr->callno]->last & 0xFFFF8000L) | (ntohs(vh->ts) & 0x7fff);
   } else {
      /* A mini frame */
      f.frametype = AST_FRAME_VOICE;
      if (iaxs[fr->callno]->voiceformat > 0)
         f.subclass = iaxs[fr->callno]->voiceformat;
      else {
         if (option_debug)
            ast_log(LOG_DEBUG, "Received mini frame before first full voice frame\n");
         iax2_vnak(fr->callno);
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }
      f.datalen = res - sizeof(struct ast_iax2_mini_hdr);
      if (f.datalen < 0) {
         ast_log(LOG_WARNING, "Datalen < 0?\n");
         ast_mutex_unlock(&iaxsl[fr->callno]);
         return 1;
      }
      if (f.datalen)
         f.data = thread->buf + sizeof(*mh);
      else
         f.data = NULL;
#ifdef IAXTESTS
      if (test_resync) {
         fr->ts = (iaxs[fr->callno]->last & 0xFFFF0000L) | ((ntohs(mh->ts) + test_resync) & 0xffff);
      } else
#endif /* IAXTESTS */
      fr->ts = (iaxs[fr->callno]->last & 0xFFFF0000L) | ntohs(mh->ts);
      /* FIXME? Surely right here would be the right place to undo timestamp wraparound? */
   }
   /* Don't pass any packets until we're started */
   if (!ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED)) {
      ast_mutex_unlock(&iaxsl[fr->callno]);
      return 1;
   }
   /* Common things */
   f.src = "IAX2";
   f.mallocd = 0;
   f.offset = 0;
   f.len = 0;
   if (f.datalen && (f.frametype == AST_FRAME_VOICE)) {
      f.samples = ast_codec_get_samples(&f);
      /* We need to byteswap incoming slinear samples from network byte order */
      if (f.subclass == AST_FORMAT_SLINEAR)
         ast_frame_byteswap_be(&f);
   } else
      f.samples = 0;
   iax_frame_wrap(fr, &f);

   /* If this is our most recent packet, use it as our basis for timestamping */
   if (iaxs[fr->callno] && iaxs[fr->callno]->last < fr->ts) {
      /*iaxs[fr->callno]->last = fr->ts; (do it afterwards cos schedule/forward_delivery needs the last ts too)*/
      fr->outoforder = 0;
   } else {
      if (option_debug && iaxdebug && iaxs[fr->callno])
         ast_log(LOG_DEBUG, "Received out of order packet... (type=%d, subclass %d, ts = %d, last = %d)\n", f.frametype, f.subclass, fr->ts, iaxs[fr->callno]->last);
      fr->outoforder = -1;
   }
   fr->cacheable = ((f.frametype == AST_FRAME_VOICE) || (f.frametype == AST_FRAME_VIDEO));
   duped_fr = iaxfrdup2(fr);
   if (duped_fr) {
      schedule_delivery(duped_fr, updatehistory, 0, &fr->ts);
   }
   if (iaxs[fr->callno] && iaxs[fr->callno]->last < fr->ts) {
      iaxs[fr->callno]->last = fr->ts;
#if 1
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "For call=%d, set last=%d\n", fr->callno, fr->ts);
#endif
   }

   /* Always run again */
   ast_mutex_unlock(&iaxsl[fr->callno]);
   return 1;
}

/* Function to clean up process thread if it is cancelled */
static void iax2_process_thread_cleanup(void *data)
{
   struct iax2_thread *thread = data;
   ast_mutex_destroy(&thread->lock);
   ast_cond_destroy(&thread->cond);
   free(thread);
   ast_atomic_dec_and_test(&iaxactivethreadcount);
}

static void *iax2_process_thread(void *data)
{
   struct iax2_thread *thread = data;
   struct timeval tv;
   struct timespec ts;
   int put_into_idle = 0;

   ast_atomic_fetchadd_int(&iaxactivethreadcount,1);
   pthread_cleanup_push(iax2_process_thread_cleanup, data);
   for(;;) {
      /* Wait for something to signal us to be awake */
      ast_mutex_lock(&thread->lock);

      /* Flag that we're ready to accept signals */
      thread->ready_for_signal = 1;
      
      /* Put into idle list if applicable */
      if (put_into_idle)
         insert_idle_thread(thread);

      if (thread->type == IAX_TYPE_DYNAMIC) {
         struct iax2_thread *t = NULL;
         /* Wait to be signalled or time out */
         tv = ast_tvadd(ast_tvnow(), ast_samp2tv(30000, 1000));
         ts.tv_sec = tv.tv_sec;
         ts.tv_nsec = tv.tv_usec * 1000;
         if (ast_cond_timedwait(&thread->cond, &thread->lock, &ts) == ETIMEDOUT) {
            /* This thread was never put back into the available dynamic
             * thread list, so just go away. */
            if (!put_into_idle) {
               ast_mutex_unlock(&thread->lock);
               break;
            }
            AST_LIST_LOCK(&dynamic_list);
            /* Account for the case where this thread is acquired *right* after a timeout */
            if ((t = AST_LIST_REMOVE(&dynamic_list, thread, list)))
               iaxdynamicthreadcount--;
            AST_LIST_UNLOCK(&dynamic_list);
            if (t) {
               /* This dynamic thread timed out waiting for a task and was
                * not acquired immediately after the timeout, 
                * so it's time to go away. */
               ast_mutex_unlock(&thread->lock);
               break;
            }
            /* Someone grabbed our thread *right* after we timed out.
             * Wait for them to set us up with something to do and signal
             * us to continue. */
            tv = ast_tvadd(ast_tvnow(), ast_samp2tv(30000, 1000));
            ts.tv_sec = tv.tv_sec;
            ts.tv_nsec = tv.tv_usec * 1000;
            if (ast_cond_timedwait(&thread->cond, &thread->lock, &ts) == ETIMEDOUT)
            {
               ast_mutex_unlock(&thread->lock);
               break;
            }
         }
      } else {
         ast_cond_wait(&thread->cond, &thread->lock);
      }

      /* Go back into our respective list */
      put_into_idle = 1;

      ast_mutex_unlock(&thread->lock);

      if (thread->iostate == IAX_IOSTATE_IDLE)
         continue;

      /* Add ourselves to the active list now */
      AST_LIST_LOCK(&active_list);
      AST_LIST_INSERT_HEAD(&active_list, thread, list);
      AST_LIST_UNLOCK(&active_list);

      /* See what we need to do */
      switch(thread->iostate) {
      case IAX_IOSTATE_READY:
         thread->actions++;
         thread->iostate = IAX_IOSTATE_PROCESSING;
         socket_process(thread);
         handle_deferred_full_frames(thread);
         break;
      case IAX_IOSTATE_SCHEDREADY:
         thread->actions++;
         thread->iostate = IAX_IOSTATE_PROCESSING;
#ifdef SCHED_MULTITHREADED
         thread->schedfunc(thread->scheddata);
#endif      
         break;
      }
      time(&thread->checktime);
      thread->iostate = IAX_IOSTATE_IDLE;
#ifdef DEBUG_SCHED_MULTITHREAD
      thread->curfunc[0]='\0';
#endif      

      /* Now... remove ourselves from the active list, and return to the idle list */
      AST_LIST_LOCK(&active_list);
      AST_LIST_REMOVE(&active_list, thread, list);
      AST_LIST_UNLOCK(&active_list);

      /* Make sure another frame didn't sneak in there after we thought we were done. */
      handle_deferred_full_frames(thread);
   }

   /*!\note For some reason, idle threads are exiting without being removed
    * from an idle list, which is causing memory corruption.  Forcibly remove
    * it from the list, if it's there.
    */
   AST_LIST_LOCK(&idle_list);
   AST_LIST_REMOVE(&idle_list, thread, list);
   AST_LIST_UNLOCK(&idle_list);

   AST_LIST_LOCK(&dynamic_list);
   AST_LIST_REMOVE(&dynamic_list, thread, list);
   AST_LIST_UNLOCK(&dynamic_list);

   /* I am exiting here on my own volition, I need to clean up my own data structures
   * Assume that I am no longer in any of the lists (idle, active, or dynamic)
   */
   pthread_cleanup_pop(1);

   return NULL;
}

static int iax2_do_register(struct iax2_registry *reg)
{
   struct iax_ie_data ied;
   if (option_debug && iaxdebug)
      ast_log(LOG_DEBUG, "Sending registration request for '%s'\n", reg->username);

   if (reg->dnsmgr && 
       ((reg->regstate == REG_STATE_TIMEOUT) || !reg->addr.sin_addr.s_addr)) {
      /* Maybe the IP has changed, force DNS refresh */
      ast_dnsmgr_refresh(reg->dnsmgr);
   }
   
   /*
    * if IP has Changed, free allocated call to create a new one with new IP
    * call has the pointer to IP and must be updated to the new one
    */
   if (reg->dnsmgr && ast_dnsmgr_changed(reg->dnsmgr) && (reg->callno > 0)) {
      ast_mutex_lock(&iaxsl[reg->callno]);
      iax2_destroy(reg->callno);
      ast_mutex_unlock(&iaxsl[reg->callno]);
      reg->callno = 0;
   }
   if (!reg->addr.sin_addr.s_addr) {
      if (option_debug && iaxdebug)
         ast_log(LOG_DEBUG, "Unable to send registration request for '%s' without IP address\n", reg->username);
      /* Setup the next registration attempt */
      AST_SCHED_DEL(sched, reg->expire);
      reg->expire  = iax2_sched_add(sched, (5 * reg->refresh / 6) * 1000, iax2_do_register_s, reg);
      return -1;
   }

   if (!reg->callno) {
      if (option_debug)
         ast_log(LOG_DEBUG, "Allocate call number\n");
      reg->callno = find_callno_locked(0, 0, &reg->addr, NEW_FORCE, defaultsockfd, 0);
      if (reg->callno < 1) {
         ast_log(LOG_WARNING, "Unable to create call for registration\n");
         return -1;
      } else if (option_debug)
         ast_log(LOG_DEBUG, "Registration created on call %d\n", reg->callno);
      iaxs[reg->callno]->reg = reg;
      ast_mutex_unlock(&iaxsl[reg->callno]);
   }
   /* Schedule the next registration attempt */
   AST_SCHED_DEL(sched, reg->expire);
   /* Setup the next registration a little early */
   reg->expire  = iax2_sched_add(sched, (5 * reg->refresh / 6) * 1000, iax2_do_register_s, reg);
   /* Send the request */
   memset(&ied, 0, sizeof(ied));
   iax_ie_append_str(&ied, IAX_IE_USERNAME, reg->username);
   iax_ie_append_short(&ied, IAX_IE_REFRESH, reg->refresh);
   send_command(iaxs[reg->callno],AST_FRAME_IAX, IAX_COMMAND_REGREQ, 0, ied.buf, ied.pos, -1);
   reg->regstate = REG_STATE_REGSENT;
   return 0;
}

static char *iax2_prov_complete_template_3rd(const char *line, const char *word, int pos, int state)
{
   if (pos != 3)
      return NULL;
   return iax_prov_complete_template(line, word, pos, state);
}

static int iax2_provision(struct sockaddr_in *end, int sockfd, char *dest, const char *template, int force)
{
   /* Returns 1 if provisioned, -1 if not able to find destination, or 0 if no provisioning
      is found for template */
   struct iax_ie_data provdata;
   struct iax_ie_data ied;
   unsigned int sig;
   struct sockaddr_in sin;
   int callno;
   struct create_addr_info cai;

   memset(&cai, 0, sizeof(cai));

   if (option_debug)
      ast_log(LOG_DEBUG, "Provisioning '%s' from template '%s'\n", dest, template);

   if (iax_provision_build(&provdata, &sig, template, force)) {
      if (option_debug)
         ast_log(LOG_DEBUG, "No provisioning found for template '%s'\n", template);
      return 0;
   }

   if (end) {
      memcpy(&sin, end, sizeof(sin));
      cai.sockfd = sockfd;
   } else if (create_addr(dest, NULL, &sin, &cai))
      return -1;

   /* Build the rest of the message */
   memset(&ied, 0, sizeof(ied));
   iax_ie_append_raw(&ied, IAX_IE_PROVISIONING, provdata.buf, provdata.pos);

   callno = find_callno_locked(0, 0, &sin, NEW_FORCE, cai.sockfd, 0);
   if (!callno)
      return -1;

   if (iaxs[callno]) {
      /* Schedule autodestruct in case they don't ever give us anything back */
      AST_SCHED_DEL(sched, iaxs[callno]->autoid);
      iaxs[callno]->autoid = iax2_sched_add(sched, 15000, auto_hangup, (void *)(long)callno);
      ast_set_flag(iaxs[callno], IAX_PROVISION);
      /* Got a call number now, so go ahead and send the provisioning information */
      send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_PROVISION, 0, ied.buf, ied.pos, -1);
   }
   ast_mutex_unlock(&iaxsl[callno]);

   return 1;
}

static char *papp = "IAX2Provision";
static char *psyn = "Provision a calling IAXy with a given template";
static char *pdescrip = 
"  IAX2Provision([template]): Provisions the calling IAXy (assuming\n"
"the calling entity is in fact an IAXy) with the given template or\n"
"default if one is not specified.  Returns -1 on error or 0 on success.\n";

/*! iax2provision
\ingroup applications
*/
static int iax2_prov_app(struct ast_channel *chan, void *data)
{
   int res;
   char *sdata;
   char *opts;
   int force =0;
   unsigned short callno = PTR_TO_CALLNO(chan->tech_pvt);
   if (ast_strlen_zero(data))
      data = "default";
   sdata = ast_strdupa(data);
   opts = strchr(sdata, '|');
   if (opts)
      *opts='\0';

   if (chan->tech != &iax2_tech) {
      ast_log(LOG_NOTICE, "Can't provision a non-IAX device!\n");
      return -1;
   } 
   if (!callno || !iaxs[callno] || !iaxs[callno]->addr.sin_addr.s_addr) {
      ast_log(LOG_NOTICE, "Can't provision something with no IP?\n");
      return -1;
   }
   res = iax2_provision(&iaxs[callno]->addr, iaxs[callno]->sockfd, NULL, sdata, force);
   if (option_verbose > 2)
      ast_verbose(VERBOSE_PREFIX_3 "Provisioned IAXY at '%s' with '%s'= %d\n", 
      ast_inet_ntoa(iaxs[callno]->addr.sin_addr),
      sdata, res);
   return res;
}


static int iax2_prov_cmd(int fd, int argc, char *argv[])
{
   int force = 0;
   int res;
   if (argc < 4)
      return RESULT_SHOWUSAGE;
   if ((argc > 4)) {
      if (!strcasecmp(argv[4], "forced"))
         force = 1;
      else
         return RESULT_SHOWUSAGE;
   }
   res = iax2_provision(NULL, -1, argv[2], argv[3], force);
   if (res < 0)
      ast_cli(fd, "Unable to find peer/address '%s'\n", argv[2]);
   else if (res < 1)
      ast_cli(fd, "No template (including wildcard) matching '%s'\n", argv[3]);
   else
      ast_cli(fd, "Provisioning '%s' with template '%s'%s\n", argv[2], argv[3], force ? ", forced" : "");
   return RESULT_SUCCESS;
}

static void __iax2_poke_noanswer(const void *data)
{
   struct iax2_peer *peer = (struct iax2_peer *)data;
   int callno;

   if (peer->lastms > -1) {
      ast_log(LOG_NOTICE, "Peer '%s' is now UNREACHABLE! Time: %d\n", peer->name, peer->lastms);
      manager_event(EVENT_FLAG_SYSTEM, "PeerStatus", "Peer: IAX2/%s\r\nPeerStatus: Unreachable\r\nTime: %d\r\n", peer->name, peer->lastms);
      ast_device_state_changed("IAX2/%s", peer->name); /* Activate notification */
   }
   if ((callno = peer->callno) > 0) {
      ast_mutex_lock(&iaxsl[callno]);
      iax2_destroy(callno);
      ast_mutex_unlock(&iaxsl[callno]);
   }
   peer->callno = 0;
   peer->lastms = -1;
   /* Try again quickly */
   peer->pokeexpire = iax2_sched_add(sched, peer->pokefreqnotok, iax2_poke_peer_s, peer_ref(peer));
   if (peer->pokeexpire == -1)
      peer_unref(peer);
}

static int iax2_poke_noanswer(const void *data)
{
   struct iax2_peer *peer = (struct iax2_peer *)data;
   peer->pokeexpire = -1;
#ifdef SCHED_MULTITHREADED
   if (schedule_action(__iax2_poke_noanswer, data))
#endif      
      __iax2_poke_noanswer(data);
   peer_unref(peer);
   return 0;
}

static int iax2_poke_peer_cb(void *obj, void *arg, int flags)
{
   struct iax2_peer *peer = obj;

   iax2_poke_peer(peer, 0);

   return 0;
}

static int iax2_poke_peer(struct iax2_peer *peer, int heldcall)
{
   int callno;
   if (!peer->maxms || (!peer->addr.sin_addr.s_addr && !peer->dnsmgr)) {
      /* IF we have no IP without dnsmgr, or this isn't to be monitored, return
        immediately after clearing things out */
      peer->lastms = 0;
      peer->historicms = 0;
      peer->pokeexpire = -1;
      peer->callno = 0;
      return 0;
   }

   /* The peer could change the callno inside iax2_destroy, since we do deadlock avoidance */
   if ((callno = peer->callno) > 0) {
      ast_log(LOG_NOTICE, "Still have a callno...\n");
      ast_mutex_lock(&iaxsl[callno]);
      iax2_destroy(callno);
      ast_mutex_unlock(&iaxsl[callno]);
   }
   if (heldcall)
      ast_mutex_unlock(&iaxsl[heldcall]);
   callno = peer->callno = find_callno(0, 0, &peer->addr, NEW_FORCE, peer->sockfd, 0);
   if (heldcall)
      ast_mutex_lock(&iaxsl[heldcall]);
   if (peer->callno < 1) {
      ast_log(LOG_WARNING, "Unable to allocate call for poking peer '%s'\n", peer->name);
      return -1;
   }

   /* Speed up retransmission times for this qualify call */
   iaxs[peer->callno]->pingtime = peer->maxms / 4 + 1;
   iaxs[peer->callno]->peerpoke = peer;
   
   /* Remove any pending pokeexpire task */
   if (peer->pokeexpire > -1) {
      if (!ast_sched_del(sched, peer->pokeexpire)) {
         peer->pokeexpire = -1;
         peer_unref(peer);
      }
   }

   /* Queue up a new task to handle no reply */
   /* If the host is already unreachable then use the unreachable interval instead */
   if (peer->lastms < 0) {
      peer->pokeexpire = iax2_sched_add(sched, peer->pokefreqnotok, iax2_poke_noanswer, peer_ref(peer));
   } else
      peer->pokeexpire = iax2_sched_add(sched, DEFAULT_MAXMS * 2, iax2_poke_noanswer, peer_ref(peer));

   if (peer->pokeexpire == -1)
      peer_unref(peer);

   /* And send the poke */
   ast_mutex_lock(&iaxsl[callno]);
   if (iaxs[callno]) {
      send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_POKE, 0, NULL, 0, -1);
   }
   ast_mutex_unlock(&iaxsl[callno]);

   return 0;
}

static void free_context(struct iax2_context *con)
{
   struct iax2_context *conl;
   while(con) {
      conl = con;
      con = con->next;
      free(conl);
   }
}

static struct ast_channel *iax2_request(const char *type, int format, void *data, int *cause)
{
   int callno;
   int res;
   int fmt, native;
   struct sockaddr_in sin;
   struct ast_channel *c;
   struct parsed_dial_string pds;
   struct create_addr_info cai;
   char *tmpstr;

   memset(&pds, 0, sizeof(pds));
   tmpstr = ast_strdupa(data);
   parse_dial_string(tmpstr, &pds);

   if (ast_strlen_zero(pds.peer)) {
      ast_log(LOG_WARNING, "No peer provided in the IAX2 dial string '%s'\n", (char *) data);
      return NULL;
   }
          
   memset(&cai, 0, sizeof(cai));
   cai.capability = iax2_capability;

   ast_copy_flags(&cai, &globalflags, IAX_NOTRANSFER | IAX_TRANSFERMEDIA | IAX_USEJITTERBUF | IAX_FORCEJITTERBUF);
   
   /* Populate our address from the given */
   if (create_addr(pds.peer, NULL, &sin, &cai)) {
      *cause = AST_CAUSE_UNREGISTERED;
      return NULL;
   }

   if (pds.port)
      sin.sin_port = htons(atoi(pds.port));

   callno = find_callno_locked(0, 0, &sin, NEW_FORCE, cai.sockfd, 0);
   if (callno < 1) {
      ast_log(LOG_WARNING, "Unable to create call\n");
      *cause = AST_CAUSE_CONGESTION;
      return NULL;
   }

   /* If this is a trunk, update it now */
   ast_copy_flags(iaxs[callno], &cai, IAX_TRUNK | IAX_SENDANI | IAX_NOTRANSFER | IAX_TRANSFERMEDIA | IAX_USEJITTERBUF | IAX_FORCEJITTERBUF); 
   if (ast_test_flag(&cai, IAX_TRUNK)) {
      int new_callno;
      if ((new_callno = make_trunk(callno, 1)) != -1)
         callno = new_callno;
   }
   iaxs[callno]->maxtime = cai.maxtime;
   if (cai.found)
      ast_string_field_set(iaxs[callno], host, pds.peer);

   c = ast_iax2_new(callno, AST_STATE_DOWN, cai.capability);

   ast_mutex_unlock(&iaxsl[callno]);

   if (c) {
      /* Choose a format we can live with */
      if (c->nativeformats & format) 
         c->nativeformats &= format;
      else {
         native = c->nativeformats;
         fmt = format;
         res = ast_translator_best_choice(&fmt, &native);
         if (res < 0) {
            ast_log(LOG_WARNING, "Unable to create translator path for %s to %s on %s\n",
               ast_getformatname(c->nativeformats), ast_getformatname(fmt), c->name);
            ast_hangup(c);
            return NULL;
         }
         c->nativeformats = native;
      }
      c->readformat = ast_best_codec(c->nativeformats);
      c->writeformat = c->readformat;
   }

   return c;
}

static void *sched_thread(void *ignore)
{
   int count;
   int res;
   struct timeval tv;
   struct timespec ts;

   for (;;) {
      res = ast_sched_wait(sched);
      if ((res > 1000) || (res < 0))
         res = 1000;
      tv = ast_tvadd(ast_tvnow(), ast_samp2tv(res, 1000));
      ts.tv_sec = tv.tv_sec;
      ts.tv_nsec = tv.tv_usec * 1000;

      pthread_testcancel();
      ast_mutex_lock(&sched_lock);
      ast_cond_timedwait(&sched_cond, &sched_lock, &ts);
      ast_mutex_unlock(&sched_lock);
      pthread_testcancel();

      count = ast_sched_runq(sched);
      if (option_debug && count >= 20)
         ast_log(LOG_DEBUG, "chan_iax2: ast_sched_runq ran %d scheduled tasks all at once\n", count);
   }
   return NULL;
}

static void *network_thread(void *ignore)
{
   /* Our job is simple: Send queued messages, retrying if necessary.  Read frames 
      from the network, and queue them for delivery to the channels */
   int res, count, wakeup;
   struct iax_frame *f;

   if (timingfd > -1)
      ast_io_add(io, timingfd, timing_read, AST_IO_IN | AST_IO_PRI, NULL);
   
   for(;;) {
      pthread_testcancel();

      /* Go through the queue, sending messages which have not yet been
         sent, and scheduling retransmissions if appropriate */
      AST_LIST_LOCK(&iaxq.queue);
      count = 0;
      wakeup = -1;
      AST_LIST_TRAVERSE_SAFE_BEGIN(&iaxq.queue, f, list) {
         if (f->sentyet)
            continue;
         
         /* Try to lock the pvt, if we can't... don't fret - defer it till later */
         if (ast_mutex_trylock(&iaxsl[f->callno])) {
            wakeup = 1;
            continue;
         }

         f->sentyet++;

         if (iaxs[f->callno]) {
            send_packet(f);
            count++;
         } 

         ast_mutex_unlock(&iaxsl[f->callno]);

         if (f->retries < 0) {
            /* This is not supposed to be retransmitted */
            AST_LIST_REMOVE_CURRENT(&iaxq.queue, list);
            iaxq.count--;
            /* Free the iax frame */
            iax_frame_free(f);
         } else {
            /* We need reliable delivery.  Schedule a retransmission */
            f->retries++;
            f->retrans = iax2_sched_add(sched, f->retrytime, attempt_transmit, f);
         }
      }
      AST_LIST_TRAVERSE_SAFE_END
      AST_LIST_UNLOCK(&iaxq.queue);

      pthread_testcancel();

      if (option_debug && count >= 20)
         ast_log(LOG_DEBUG, "chan_iax2: Sent %d queued outbound frames all at once\n", count);

      /* Now do the IO, and run scheduled tasks */
      res = ast_io_wait(io, wakeup);
      if (res >= 0) {
         if (option_debug && res >= 20)
            ast_log(LOG_DEBUG, "chan_iax2: ast_io_wait ran %d I/Os all at once\n", res);
      }
   }
   return NULL;
}

static int start_network_thread(void)
{
   pthread_attr_t attr;
   int threadcount = 0;
   int x;
   for (x = 0; x < iaxthreadcount; x++) {
      struct iax2_thread *thread = ast_calloc(1, sizeof(struct iax2_thread));
      if (thread) {
         thread->type = IAX_TYPE_POOL;
         thread->threadnum = ++threadcount;
         ast_mutex_init(&thread->lock);
         ast_cond_init(&thread->cond, NULL);
         pthread_attr_init(&attr);
         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);   
         if (ast_pthread_create(&thread->threadid, &attr, iax2_process_thread, thread)) {
            ast_log(LOG_WARNING, "Failed to create new thread!\n");
            free(thread);
            thread = NULL;
         }
         AST_LIST_LOCK(&idle_list);
         AST_LIST_INSERT_TAIL(&idle_list, thread, list);
         AST_LIST_UNLOCK(&idle_list);
      }
   }
   ast_pthread_create_background(&schedthreadid, NULL, sched_thread, NULL);
   ast_pthread_create_background(&netthreadid, NULL, network_thread, NULL);
   if (option_verbose > 1)
      ast_verbose(VERBOSE_PREFIX_2 "%d helper threaads started\n", threadcount);
   return 0;
}

static struct iax2_context *build_context(char *context)
{
   struct iax2_context *con;

   if ((con = ast_calloc(1, sizeof(*con))))
      ast_copy_string(con->context, context, sizeof(con->context));
   
   return con;
}

static int get_auth_methods(char *value)
{
   int methods = 0;
   if (strstr(value, "rsa"))
      methods |= IAX_AUTH_RSA;
   if (strstr(value, "md5"))
      methods |= IAX_AUTH_MD5;
   if (strstr(value, "plaintext"))
      methods |= IAX_AUTH_PLAINTEXT;
   return methods;
}


/*! \brief Check if address can be used as packet source.
 \return 0  address available, 1  address unavailable, -1  error
*/
static int check_srcaddr(struct sockaddr *sa, socklen_t salen)
{
   int sd;
   int res;
   
   sd = socket(AF_INET, SOCK_DGRAM, 0);
   if (sd < 0) {
      ast_log(LOG_ERROR, "Socket: %s\n", strerror(errno));
      return -1;
   }

   res = bind(sd, sa, salen);
   if (res < 0) {
      if (option_debug)
         ast_log(LOG_DEBUG, "Can't bind: %s\n", strerror(errno));
      close(sd);
      return 1;
   }

   close(sd);
   return 0;
}

/*! \brief Parse the "sourceaddress" value,
  lookup in netsock list and set peer's sockfd. Defaults to defaultsockfd if
  not found. */
static int peer_set_srcaddr(struct iax2_peer *peer, const char *srcaddr)
{
   struct sockaddr_in sin;
   int nonlocal = 1;
   int port = IAX_DEFAULT_PORTNO;
   int sockfd = defaultsockfd;
   char *tmp;
   char *addr;
   char *portstr;

   if (!(tmp = ast_strdupa(srcaddr)))
      return -1;

   addr = strsep(&tmp, ":");
   portstr = tmp;

   if (portstr) {
      port = atoi(portstr);
      if (port < 1)
         port = IAX_DEFAULT_PORTNO;
   }
   
   if (!ast_get_ip(&sin, addr)) {
      struct ast_netsock *sock;
      int res;

      sin.sin_port = 0;
      sin.sin_family = AF_INET;
      res = check_srcaddr((struct sockaddr *) &sin, sizeof(sin));
      if (res == 0) {
         /* ip address valid. */
         sin.sin_port = htons(port);
         if (!(sock = ast_netsock_find(netsock, &sin)))
            sock = ast_netsock_find(outsock, &sin);
         if (sock) {
            sockfd = ast_netsock_sockfd(sock);
            nonlocal = 0;
         } else {
            unsigned int orig_saddr = sin.sin_addr.s_addr;
            /* INADDR_ANY matches anyway! */
            sin.sin_addr.s_addr = INADDR_ANY;
            if (ast_netsock_find(netsock, &sin)) {
               sin.sin_addr.s_addr = orig_saddr;
               sock = ast_netsock_bind(outsock, io, srcaddr, port, tos, socket_read, NULL);
               if (sock) {
                  sockfd = ast_netsock_sockfd(sock);
                  ast_netsock_unref(sock);
                  nonlocal = 0;
               } else {
                  nonlocal = 2;
               }
            }
         }
      }
   }
      
   peer->sockfd = sockfd;

   if (nonlocal == 1) {
      ast_log(LOG_WARNING, "Non-local or unbound address specified (%s) in sourceaddress for '%s', reverting to default\n",
         srcaddr, peer->name);
      return -1;
        } else if (nonlocal == 2) {
      ast_log(LOG_WARNING, "Unable to bind to sourceaddress '%s' for '%s', reverting to default\n",
         srcaddr, peer->name);
         return -1;
   } else {
      if (option_debug)
         ast_log(LOG_DEBUG, "Using sourceaddress %s for '%s'\n", srcaddr, peer->name);
      return 0;
   }
}

static void peer_destructor(void *obj)
{
   struct iax2_peer *peer = obj;

   ast_free_ha(peer->ha);

   if (peer->callno > 0) {
      ast_mutex_lock(&iaxsl[peer->callno]);
      iax2_destroy(peer->callno);
      ast_mutex_unlock(&iaxsl[peer->callno]);
   }

   register_peer_exten(peer, 0);

   if (peer->dnsmgr)
      ast_dnsmgr_release(peer->dnsmgr);

   ast_string_field_free_memory(peer);
}

/*! \brief Create peer structure based on configuration */
static struct iax2_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int temponly)
{
   struct iax2_peer *peer = NULL;
   struct ast_ha *oldha = NULL;
   int maskfound=0;
   int found=0;
   int firstpass=1;
   struct iax2_peer tmp_peer = {
      .name = name,
   };

   if (!temponly) {
      peer = ao2_find(peers, &tmp_peer, OBJ_POINTER);
      if (peer && !ast_test_flag(peer, IAX_DELME))
         firstpass = 0;
   }

   if (peer) {
      found++;
      if (firstpass) {
         oldha = peer->ha;
         peer->ha = NULL;
      }
      unlink_peer(peer);
   } else if ((peer = ao2_alloc(sizeof(*peer), peer_destructor))) {
      peer->expire = -1;
      peer->pokeexpire = -1;
      peer->sockfd = defaultsockfd;
      if (ast_string_field_init(peer, 32))
         peer = peer_unref(peer);
   }

   if (peer) {
      if (firstpass) {
         ast_copy_flags(peer, &globalflags, IAX_USEJITTERBUF | IAX_FORCEJITTERBUF);
         peer->encmethods = iax2_encryption;
         peer->adsi = adsi;
         ast_string_field_set(peer,secret,"");
         if (!found) {
            ast_string_field_set(peer, name, name);
            peer->addr.sin_port = htons(IAX_DEFAULT_PORTNO);
            peer->expiry = min_reg_expire;
         }
         peer->prefs = prefs;
         peer->capability = iax2_capability;
         peer->smoothing = 0;
         peer->pokefreqok = DEFAULT_FREQ_OK;
         peer->pokefreqnotok = DEFAULT_FREQ_NOTOK;
         ast_string_field_set(peer,context,"");
         ast_string_field_set(peer,peercontext,"");
         ast_clear_flag(peer, IAX_HASCALLERID);
         ast_string_field_set(peer, cid_name, "");
         ast_string_field_set(peer, cid_num, "");
      }

      if (!v) {
         v = alt;
         alt = NULL;
      }
      while(v) {
         if (!strcasecmp(v->name, "secret")) {
            ast_string_field_set(peer, secret, v->value);
         } else if (!strcasecmp(v->name, "mailbox")) {
            ast_string_field_set(peer, mailbox, v->value);
         } else if (!strcasecmp(v->name, "mohinterpret")) {
            ast_string_field_set(peer, mohinterpret, v->value);
         } else if (!strcasecmp(v->name, "mohsuggest")) {
            ast_string_field_set(peer, mohsuggest, v->value);
         } else if (!strcasecmp(v->name, "dbsecret")) {
            ast_string_field_set(peer, dbsecret, v->value);
         } else if (!strcasecmp(v->name, "trunk")) {
            ast_set2_flag(peer, ast_true(v->value), IAX_TRUNK);   
            if (ast_test_flag(peer, IAX_TRUNK) && (timingfd < 0)) {
               ast_log(LOG_WARNING, "Unable to support trunking on peer '%s' without zaptel timing\n", peer->name);
               ast_clear_flag(peer, IAX_TRUNK);
            }
         } else if (!strcasecmp(v->name, "auth")) {
            peer->authmethods = get_auth_methods(v->value);
         } else if (!strcasecmp(v->name, "encryption")) {
            peer->encmethods = get_encrypt_methods(v->value);
         } else if (!strcasecmp(v->name, "notransfer")) {
            ast_log(LOG_NOTICE, "The option 'notransfer' is deprecated in favor of 'transfer' which has options 'yes', 'no', and 'mediaonly'\n");
            ast_clear_flag(peer, IAX_TRANSFERMEDIA);  
            ast_set2_flag(peer, ast_true(v->value), IAX_NOTRANSFER); 
         } else if (!strcasecmp(v->name, "transfer")) {
            if (!strcasecmp(v->value, "mediaonly")) {
               ast_set_flags_to(peer, IAX_NOTRANSFER|IAX_TRANSFERMEDIA, IAX_TRANSFERMEDIA);  
            } else if (ast_true(v->value)) {
               ast_set_flags_to(peer, IAX_NOTRANSFER|IAX_TRANSFERMEDIA, 0);
            } else 
               ast_set_flags_to(peer, IAX_NOTRANSFER|IAX_TRANSFERMEDIA, IAX_NOTRANSFER);
         } else if (!strcasecmp(v->name, "jitterbuffer")) {
            ast_set2_flag(peer, ast_true(v->value), IAX_USEJITTERBUF);  
         } else if (!strcasecmp(v->name, "forcejitterbuffer")) {
            ast_set2_flag(peer, ast_true(v->value), IAX_FORCEJITTERBUF);   
         } else if (!strcasecmp(v->name, "host")) {
            if (!strcasecmp(v->value, "dynamic")) {
               /* They'll register with us */
               ast_set_flag(peer, IAX_DYNAMIC); 
               if (!found) {
                  /* Initialize stuff iff we're not found, otherwise
                     we keep going with what we had */
                  memset(&peer->addr.sin_addr, 0, 4);
                  if (peer->addr.sin_port) {
                     /* If we've already got a port, make it the default rather than absolute */
                     peer->defaddr.sin_port = peer->addr.sin_port;
                     peer->addr.sin_port = 0;
                  }
               }
            } else {
               /* Non-dynamic.  Make sure we become that way if we're not */
               AST_SCHED_DEL(sched, peer->expire);
               ast_clear_flag(peer, IAX_DYNAMIC);
               if (ast_dnsmgr_lookup(v->value, &peer->addr.sin_addr, &peer->dnsmgr))
                  return peer_unref(peer);
               if (!peer->addr.sin_port)
                  peer->addr.sin_port = htons(IAX_DEFAULT_PORTNO);
            }
            if (!maskfound)
               inet_aton("255.255.255.255", &peer->mask);
         } else if (!strcasecmp(v->name, "defaultip")) {
            if (ast_get_ip(&peer->defaddr, v->value))
               return peer_unref(peer);
         } else if (!strcasecmp(v->name, "sourceaddress")) {
            peer_set_srcaddr(peer, v->value);
         } else if (!strcasecmp(v->name, "permit") ||
                  !strcasecmp(v->name, "deny")) {
            peer->ha = ast_append_ha(v->name, v->value, peer->ha);
         } else if (!strcasecmp(v->name, "mask")) {
            maskfound++;
            inet_aton(v->value, &peer->mask);
         } else if (!strcasecmp(v->name, "context")) {
            ast_string_field_set(peer, context, v->value);
         } else if (!strcasecmp(v->name, "regexten")) {
            ast_string_field_set(peer, regexten, v->value);
         } else if (!strcasecmp(v->name, "peercontext")) {
            ast_string_field_set(peer, peercontext, v->value);
         } else if (!strcasecmp(v->name, "port")) {
            if (ast_test_flag(peer, IAX_DYNAMIC))
               peer->defaddr.sin_port = htons(atoi(v->value));
            else
               peer->addr.sin_port = htons(atoi(v->value));
         } else if (!strcasecmp(v->name, "username")) {
            ast_string_field_set(peer, username, v->value);
         } else if (!strcasecmp(v->name, "allow")) {
            ast_parse_allow_disallow(&peer->prefs, &peer->capability, v->value, 1);
         } else if (!strcasecmp(v->name, "disallow")) {
            ast_parse_allow_disallow(&peer->prefs, &peer->capability, v->value, 0);
         } else if (!strcasecmp(v->name, "callerid")) {
            if (!ast_strlen_zero(v->value)) {
               char name2[80];
               char num2[80];
               ast_callerid_split(v->value, name2, 80, num2, 80);
               ast_string_field_set(peer, cid_name, name2);
               ast_string_field_set(peer, cid_num, num2);
               ast_set_flag(peer, IAX_HASCALLERID);
            } else {
               ast_clear_flag(peer, IAX_HASCALLERID);
               ast_string_field_set(peer, cid_name, "");
               ast_string_field_set(peer, cid_num, "");
            }
         } else if (!strcasecmp(v->name, "fullname")) {
            if (!ast_strlen_zero(v->value)) {
               ast_string_field_set(peer, cid_name, v->value);
               ast_set_flag(peer, IAX_HASCALLERID);
            } else {
               ast_string_field_set(peer, cid_name, "");
               if (ast_strlen_zero(peer->cid_num))
                  ast_clear_flag(peer, IAX_HASCALLERID);
            }
         } else if (!strcasecmp(v->name, "cid_number")) {
            if (!ast_strlen_zero(v->value)) {
               ast_string_field_set(peer, cid_num, v->value);
               ast_set_flag(peer, IAX_HASCALLERID);
            } else {
               ast_string_field_set(peer, cid_num, "");
               if (ast_strlen_zero(peer->cid_name))
                  ast_clear_flag(peer, IAX_HASCALLERID);
            }
         } else if (!strcasecmp(v->name, "sendani")) {
            ast_set2_flag(peer, ast_true(v->value), IAX_SENDANI); 
         } else if (!strcasecmp(v->name, "inkeys")) {
            ast_string_field_set(peer, inkeys, v->value);
         } else if (!strcasecmp(v->name, "outkey")) {
            ast_string_field_set(peer, outkey, v->value);
         } else if (!strcasecmp(v->name, "qualify")) {
            if (!strcasecmp(v->value, "no")) {
               peer->maxms = 0;
            } else if (!strcasecmp(v->value, "yes")) {
               peer->maxms = DEFAULT_MAXMS;
            } else if (sscanf(v->value, "%d", &peer->maxms) != 1) {
               ast_log(LOG_WARNING, "Qualification of peer '%s' should be 'yes', 'no', or a number of milliseconds at line %d of iax.conf\n", peer->name, v->lineno);
               peer->maxms = 0;
            }
         } else if (!strcasecmp(v->name, "qualifysmoothing")) {
            peer->smoothing = ast_true(v->value);
         } else if (!strcasecmp(v->name, "qualifyfreqok")) {
            if (sscanf(v->value, "%d", &peer->pokefreqok) != 1) {
               ast_log(LOG_WARNING, "Qualification testing frequency of peer '%s' when OK should a number of milliseconds at line %d of iax.conf\n", peer->name, v->lineno);
            }
         } else if (!strcasecmp(v->name, "qualifyfreqnotok")) {
            if (sscanf(v->value, "%d", &peer->pokefreqnotok) != 1) {
               ast_log(LOG_WARNING, "Qualification testing frequency of peer '%s' when NOT OK should be a number of milliseconds at line %d of iax.conf\n", peer->name, v->lineno);
            } else ast_log(LOG_WARNING, "Set peer->pokefreqnotok to %d\n", peer->pokefreqnotok);
         } else if (!strcasecmp(v->name, "timezone")) {
            ast_string_field_set(peer, zonetag, v->value);
         } else if (!strcasecmp(v->name, "adsi")) {
            peer->adsi = ast_true(v->value);
         }/* else if (strcasecmp(v->name,"type")) */
         /* ast_log(LOG_WARNING, "Ignoring %s\n", v->name); */
         v = v->next;
         if (!v) {
            v = alt;
            alt = NULL;
         }
      }
      if (!peer->authmethods)
         peer->authmethods = IAX_AUTH_MD5 | IAX_AUTH_PLAINTEXT;
      ast_clear_flag(peer, IAX_DELME); 
      /* Make sure these are IPv4 addresses */
      peer->addr.sin_family = AF_INET;
   }
   if (oldha)
      ast_free_ha(oldha);
   return peer;
}

static void user_destructor(void *obj)
{
   struct iax2_user *user = obj;

   ast_free_ha(user->ha);
   free_context(user->contexts);
   if(user->vars) {
      ast_variables_destroy(user->vars);
      user->vars = NULL;
   }
   ast_string_field_free_memory(user);
}

/*! \brief Create in-memory user structure from configuration */
static struct iax2_user *build_user(const char *name, struct ast_variable *v, struct ast_variable *alt, int temponly)
{
   struct iax2_user *user = NULL;
   struct iax2_context *con, *conl = NULL;
   struct ast_ha *oldha = NULL;
   struct iax2_context *oldcon = NULL;
   int format;
   int firstpass=1;
   int oldcurauthreq = 0;
   char *varname = NULL, *varval = NULL;
   struct ast_variable *tmpvar = NULL;
   struct iax2_user tmp_user = {
      .name = name,
   };

   if (!temponly) {
      user = ao2_find(users, &tmp_user, OBJ_POINTER);
      if (user && !ast_test_flag(user, IAX_DELME))
         firstpass = 0;
   }

   if (user) {
      if (firstpass) {
         oldcurauthreq = user->curauthreq;
         oldha = user->ha;
         oldcon = user->contexts;
         user->ha = NULL;
         user->contexts = NULL;
      }
      /* Already in the list, remove it and it will be added back (or FREE'd) */
      ao2_unlink(users, user);
   } else {
      user = ao2_alloc(sizeof(*user), user_destructor);
   }
   
   if (user) {
      if (firstpass) {
         ast_string_field_free_memory(user);
         memset(user, 0, sizeof(struct iax2_user));
         if (ast_string_field_init(user, 32)) {
            user = user_unref(user);
            goto cleanup;
         }
         user->maxauthreq = maxauthreq;
         user->curauthreq = oldcurauthreq;
         user->prefs = prefs;
         user->capability = iax2_capability;
         user->encmethods = iax2_encryption;
         user->adsi = adsi;
         ast_string_field_set(user, name, name);
         ast_string_field_set(user, language, language);
         ast_copy_flags(user, &globalflags, IAX_USEJITTERBUF | IAX_FORCEJITTERBUF | IAX_CODEC_USER_FIRST | IAX_CODEC_NOPREFS | IAX_CODEC_NOCAP);   
         ast_clear_flag(user, IAX_HASCALLERID);
         ast_string_field_set(user, cid_name, "");
         ast_string_field_set(user, cid_num, "");
      }
      if (!v) {
         v = alt;
         alt = NULL;
      }
      while(v) {
         if (!strcasecmp(v->name, "context")) {
            con = build_context(v->value);
            if (con) {
               if (conl)
                  conl->next = con;
               else
                  user->contexts = con;
               conl = con;
            }
         } else if (!strcasecmp(v->name, "permit") ||
                  !strcasecmp(v->name, "deny")) {
            user->ha = ast_append_ha(v->name, v->value, user->ha);
         } else if (!strcasecmp(v->name, "setvar")) {
            varname = ast_strdupa(v->value);
            if (varname && (varval = strchr(varname,'='))) {
               *varval = '\0';
               varval++;
               if((tmpvar = ast_variable_new(varname, varval))) {
                  tmpvar->next = user->vars; 
                  user->vars = tmpvar;
               }
            }
         } else if (!strcasecmp(v->name, "allow")) {
            ast_parse_allow_disallow(&user->prefs, &user->capability, v->value, 1);
         } else if (!strcasecmp(v->name, "disallow")) {
            ast_parse_allow_disallow(&user->prefs, &user->capability,v->value, 0);
         } else if (!strcasecmp(v->name, "trunk")) {
            ast_set2_flag(user, ast_true(v->value), IAX_TRUNK);   
            if (ast_test_flag(user, IAX_TRUNK) && (timingfd < 0)) {
               ast_log(LOG_WARNING, "Unable to support trunking on user '%s' without zaptel timing\n", user->name);
               ast_clear_flag(user, IAX_TRUNK);
            }
         } else if (!strcasecmp(v->name, "auth")) {
            user->authmethods = get_auth_methods(v->value);
         } else if (!strcasecmp(v->name, "encryption")) {
            user->encmethods = get_encrypt_methods(v->value);
         } else if (!strcasecmp(v->name, "notransfer")) {
            ast_log(LOG_NOTICE, "The option 'notransfer' is deprecated in favor of 'transfer' which has options 'yes', 'no', and 'mediaonly'\n");
            ast_clear_flag(user, IAX_TRANSFERMEDIA);  
            ast_set2_flag(user, ast_true(v->value), IAX_NOTRANSFER); 
         } else if (!strcasecmp(v->name, "transfer")) {
            if (!strcasecmp(v->value, "mediaonly")) {
               ast_set_flags_to(user, IAX_NOTRANSFER|IAX_TRANSFERMEDIA, IAX_TRANSFERMEDIA);  
            } else if (ast_true(v->value)) {
               ast_set_flags_to(user, IAX_NOTRANSFER|IAX_TRANSFERMEDIA, 0);
            } else 
               ast_set_flags_to(user, IAX_NOTRANSFER|IAX_TRANSFERMEDIA, IAX_NOTRANSFER);
         } else if (!strcasecmp(v->name, "codecpriority")) {
            if(!strcasecmp(v->value, "caller"))
               ast_set_flag(user, IAX_CODEC_USER_FIRST);
            else if(!strcasecmp(v->value, "disabled"))
               ast_set_flag(user, IAX_CODEC_NOPREFS);
            else if(!strcasecmp(v->value, "reqonly")) {
               ast_set_flag(user, IAX_CODEC_NOCAP);
               ast_set_flag(user, IAX_CODEC_NOPREFS);
            }
         } else if (!strcasecmp(v->name, "jitterbuffer")) {
            ast_set2_flag(user, ast_true(v->value), IAX_USEJITTERBUF);
         } else if (!strcasecmp(v->name, "forcejitterbuffer")) {
            ast_set2_flag(user, ast_true(v->value), IAX_FORCEJITTERBUF);
         } else if (!strcasecmp(v->name, "dbsecret")) {
            ast_string_field_set(user, dbsecret, v->value);
         } else if (!strcasecmp(v->name, "secret")) {
            if (!ast_strlen_zero(user->secret)) {
               char *old = ast_strdupa(user->secret);

               ast_string_field_build(user, secret, "%s;%s", old, v->value);
            } else
               ast_string_field_set(user, secret, v->value);
         } else if (!strcasecmp(v->name, "callerid")) {
            if (!ast_strlen_zero(v->value) && strcasecmp(v->value, "asreceived")) {
               char name2[80];
               char num2[80];
               ast_callerid_split(v->value, name2, sizeof(name2), num2, sizeof(num2));
               ast_string_field_set(user, cid_name, name2);
               ast_string_field_set(user, cid_num, num2);
               ast_set_flag(user, IAX_HASCALLERID);
            } else {
               ast_clear_flag(user, IAX_HASCALLERID);
               ast_string_field_set(user, cid_name, "");
               ast_string_field_set(user, cid_num, "");
            }
         } else if (!strcasecmp(v->name, "fullname")) {
            if (!ast_strlen_zero(v->value)) {
               ast_string_field_set(user, cid_name, v->value);
               ast_set_flag(user, IAX_HASCALLERID);
            } else {
               ast_string_field_set(user, cid_name, "");
               if (ast_strlen_zero(user->cid_num))
                  ast_clear_flag(user, IAX_HASCALLERID);
            }
         } else if (!strcasecmp(v->name, "cid_number")) {
            if (!ast_strlen_zero(v->value)) {
               ast_string_field_set(user, cid_num, v->value);
               ast_set_flag(user, IAX_HASCALLERID);
            } else {
               ast_string_field_set(user, cid_num, "");
               if (ast_strlen_zero(user->cid_name))
                  ast_clear_flag(user, IAX_HASCALLERID);
            }
         } else if (!strcasecmp(v->name, "accountcode")) {
            ast_string_field_set(user, accountcode, v->value);
         } else if (!strcasecmp(v->name, "mohinterpret")) {
            ast_string_field_set(user, mohinterpret, v->value);
         } else if (!strcasecmp(v->name, "mohsuggest")) {
            ast_string_field_set(user, mohsuggest, v->value);
         } else if (!strcasecmp(v->name, "language")) {
            ast_string_field_set(user, language, v->value);
         } else if (!strcasecmp(v->name, "amaflags")) {
            format = ast_cdr_amaflags2int(v->value);
            if (format < 0) {
               ast_log(LOG_WARNING, "Invalid AMA Flags: %s at line %d\n", v->value, v->lineno);
            } else {
               user->amaflags = format;
            }
         } else if (!strcasecmp(v->name, "inkeys")) {
            ast_string_field_set(user, inkeys, v->value);
         } else if (!strcasecmp(v->name, "maxauthreq")) {
            user->maxauthreq = atoi(v->value);
            if (user->maxauthreq < 0)
               user->maxauthreq = 0;
         } else if (!strcasecmp(v->name, "adsi")) {
            user->adsi = ast_true(v->value);
         }/* else if (strcasecmp(v->name,"type")) */
         /* ast_log(LOG_WARNING, "Ignoring %s\n", v->name); */
         v = v->next;
         if (!v) {
            v = alt;
            alt = NULL;
         }
      }
      if (!user->authmethods) {
         if (!ast_strlen_zero(user->secret)) {
            user->authmethods = IAX_AUTH_MD5 | IAX_AUTH_PLAINTEXT;
            if (!ast_strlen_zero(user->inkeys))
               user->authmethods |= IAX_AUTH_RSA;
         } else if (!ast_strlen_zero(user->inkeys)) {
            user->authmethods = IAX_AUTH_RSA;
         } else {
            user->authmethods = IAX_AUTH_MD5 | IAX_AUTH_PLAINTEXT;
         }
      }
      ast_clear_flag(user, IAX_DELME);
   }
cleanup:
   if (oldha)
      ast_free_ha(oldha);
   if (oldcon)
      free_context(oldcon);
   return user;
}

static int peer_delme_cb(void *obj, void *arg, int flags)
{
   struct iax2_peer *peer = obj;

   ast_set_flag(peer, IAX_DELME);

   return 0;
}

static int user_delme_cb(void *obj, void *arg, int flags)
{
   struct iax2_user *user = obj;

   ast_set_flag(user, IAX_DELME);

   return 0;
}

static void delete_users(void)
{
   struct iax2_registry *reg;

   ao2_callback(users, 0, user_delme_cb, NULL);

   AST_LIST_LOCK(&registrations);
   while ((reg = AST_LIST_REMOVE_HEAD(&registrations, entry))) {
      ast_sched_del(sched, reg->expire);
      if (reg->callno) {
         ast_mutex_lock(&iaxsl[reg->callno]);
         if (iaxs[reg->callno]) {
            iaxs[reg->callno]->reg = NULL;
            iax2_destroy(reg->callno);
         }
         ast_mutex_unlock(&iaxsl[reg->callno]);
      }
      if (reg->dnsmgr)
         ast_dnsmgr_release(reg->dnsmgr);
      free(reg);
   }
   AST_LIST_UNLOCK(&registrations);

   ao2_callback(peers, 0, peer_delme_cb, NULL);
}

static void prune_users(void)
{
   struct iax2_user *user;
   struct ao2_iterator i;

   i = ao2_iterator_init(users, 0);
   while ((user = ao2_iterator_next(&i))) {
      if (ast_test_flag(user, IAX_DELME))
         ao2_unlink(users, user);
      user_unref(user);
   }
}

/* Prune peers who still are supposed to be deleted */
static void prune_peers(void)
{
   struct iax2_peer *peer;
   struct ao2_iterator i;

   i = ao2_iterator_init(peers, 0);
   while ((peer = ao2_iterator_next(&i))) {
      if (ast_test_flag(peer, IAX_DELME))
         unlink_peer(peer);
      peer_unref(peer);
   }
}

static void set_timing(void)
{
#ifdef HAVE_ZAPTEL
   int bs = trunkfreq * 8;
   if (timingfd > -1) {
      if (
#ifdef ZT_TIMERACK
         ioctl(timingfd, ZT_TIMERCONFIG, &bs) &&
#endif         
         ioctl(timingfd, ZT_SET_BLOCKSIZE, &bs))
         ast_log(LOG_WARNING, "Unable to set blocksize on timing source\n");
   }
#endif
}

static void set_config_destroy(void)
{
   strcpy(accountcode, "");
   strcpy(language, "");
   strcpy(mohinterpret, "default");
   strcpy(mohsuggest, "");
   amaflags = 0;
   delayreject = 0;
   ast_clear_flag((&globalflags), IAX_NOTRANSFER); 
   ast_clear_flag((&globalflags), IAX_TRANSFERMEDIA); 
   ast_clear_flag((&globalflags), IAX_USEJITTERBUF);  
   ast_clear_flag((&globalflags), IAX_FORCEJITTERBUF);   
   delete_users();
}

/*! \brief Load configuration */
static int set_config(char *config_file, int reload)
{
   struct ast_config *cfg, *ucfg;
   int capability=iax2_capability;
   struct ast_variable *v;
   char *cat;
   const char *utype;
   const char *tosval;
   int format;
   int portno = IAX_DEFAULT_PORTNO;
   int  x;
   struct iax2_user *user;
   struct iax2_peer *peer;
   struct ast_netsock *ns;
#if 0
   static unsigned short int last_port=0;
#endif

   cfg = ast_config_load(config_file);
   
   if (!cfg) {
      ast_log(LOG_ERROR, "Unable to load config %s\n", config_file);
      return -1;
   }

   if (reload) {
      set_config_destroy();
   }

   /* Reset global codec prefs */   
   memset(&prefs, 0 , sizeof(struct ast_codec_pref));
   
   /* Reset Global Flags */
   memset(&globalflags, 0, sizeof(globalflags));
   ast_set_flag(&globalflags, IAX_RTUPDATE);

#ifdef SO_NO_CHECK
   nochecksums = 0;
#endif

   min_reg_expire = IAX_DEFAULT_REG_EXPIRE;
   max_reg_expire = IAX_DEFAULT_REG_EXPIRE;

   maxauthreq = 3;

   v = ast_variable_browse(cfg, "general");

   /* Seed initial tos value */
   tosval = ast_variable_retrieve(cfg, "general", "tos");
   if (tosval) {
      if (ast_str2tos(tosval, &tos))
         ast_log(LOG_WARNING, "Invalid tos value, see doc/ip-tos.txt for more information.\n");
   }
   while(v) {
      if (!strcasecmp(v->name, "bindport")){ 
         if (reload)
            ast_log(LOG_NOTICE, "Ignoring bindport on reload\n");
         else
            portno = atoi(v->value);
      } else if (!strcasecmp(v->name, "pingtime")) 
         ping_time = atoi(v->value);
      else if (!strcasecmp(v->name, "iaxthreadcount")) {
         if (reload) {
            if (atoi(v->value) != iaxthreadcount)
               ast_log(LOG_NOTICE, "Ignoring any changes to iaxthreadcount during reload\n");
         } else {
            iaxthreadcount = atoi(v->value);
            if (iaxthreadcount < 1) {
               ast_log(LOG_NOTICE, "iaxthreadcount must be at least 1.\n");
               iaxthreadcount = 1;
            } else if (iaxthreadcount > 256) {
               ast_log(LOG_NOTICE, "limiting iaxthreadcount to 256\n");
               iaxthreadcount = 256;
            }
         }
      } else if (!strcasecmp(v->name, "iaxmaxthreadcount")) {
         if (reload) {
            AST_LIST_LOCK(&dynamic_list);
            iaxmaxthreadcount = atoi(v->value);
            AST_LIST_UNLOCK(&dynamic_list);
         } else {
            iaxmaxthreadcount = atoi(v->value);
            if (iaxmaxthreadcount < 0) {
               ast_log(LOG_NOTICE, "iaxmaxthreadcount must be at least 0.\n");
               iaxmaxthreadcount = 0;
            } else if (iaxmaxthreadcount > 256) {
               ast_log(LOG_NOTICE, "Limiting iaxmaxthreadcount to 256\n");
               iaxmaxthreadcount = 256;
            }
         }
      } else if (!strcasecmp(v->name, "nochecksums")) {
#ifdef SO_NO_CHECK
         if (ast_true(v->value))
            nochecksums = 1;
         else
            nochecksums = 0;
#else
         if (ast_true(v->value))
            ast_log(LOG_WARNING, "Disabling RTP checksums is not supported on this operating system!\n");
#endif
      }
      else if (!strcasecmp(v->name, "maxjitterbuffer")) 
         maxjitterbuffer = atoi(v->value);
      else if (!strcasecmp(v->name, "resyncthreshold")) 
         resyncthreshold = atoi(v->value);
      else if (!strcasecmp(v->name, "maxjitterinterps")) 
         maxjitterinterps = atoi(v->value);
      else if (!strcasecmp(v->name, "lagrqtime")) 
         lagrq_time = atoi(v->value);
      else if (!strcasecmp(v->name, "maxregexpire")) 
         max_reg_expire = atoi(v->value);
      else if (!strcasecmp(v->name, "minregexpire")) 
         min_reg_expire = atoi(v->value);
      else if (!strcasecmp(v->name, "bindaddr")) {
         if (reload) {
            ast_log(LOG_NOTICE, "Ignoring bindaddr on reload\n");
         } else {
            if (!(ns = ast_netsock_bind(netsock, io, v->value, portno, tos, socket_read, NULL))) {
               ast_log(LOG_WARNING, "Unable apply binding to '%s' at line %d\n", v->value, v->lineno);
            } else {
               if (option_verbose > 1) {
                  if (strchr(v->value, ':'))
                     ast_verbose(VERBOSE_PREFIX_2 "Binding IAX2 to '%s'\n", v->value);
                  else
                     ast_verbose(VERBOSE_PREFIX_2 "Binding IAX2 to '%s:%d'\n", v->value, portno);
               }
               if (defaultsockfd < 0) 
                  defaultsockfd = ast_netsock_sockfd(ns);
               ast_netsock_unref(ns);
            }
         }
      } else if (!strcasecmp(v->name, "authdebug"))
         authdebug = ast_true(v->value);
      else if (!strcasecmp(v->name, "encryption"))
         iax2_encryption = get_encrypt_methods(v->value);
      else if (!strcasecmp(v->name, "notransfer")) {
         ast_log(LOG_NOTICE, "The option 'notransfer' is deprecated in favor of 'transfer' which has options 'yes', 'no', and 'mediaonly'\n");
         ast_clear_flag((&globalflags), IAX_TRANSFERMEDIA); 
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_NOTRANSFER);   
      } else if (!strcasecmp(v->name, "transfer")) {
         if (!strcasecmp(v->value, "mediaonly")) {
            ast_set_flags_to((&globalflags), IAX_NOTRANSFER|IAX_TRANSFERMEDIA, IAX_TRANSFERMEDIA); 
         } else if (ast_true(v->value)) {
            ast_set_flags_to((&globalflags), IAX_NOTRANSFER|IAX_TRANSFERMEDIA, 0);
         } else 
            ast_set_flags_to((&globalflags), IAX_NOTRANSFER|IAX_TRANSFERMEDIA, IAX_NOTRANSFER);
      } else if (!strcasecmp(v->name, "codecpriority")) {
         if(!strcasecmp(v->value, "caller"))
            ast_set_flag((&globalflags), IAX_CODEC_USER_FIRST);
         else if(!strcasecmp(v->value, "disabled"))
            ast_set_flag((&globalflags), IAX_CODEC_NOPREFS);
         else if(!strcasecmp(v->value, "reqonly")) {
            ast_set_flag((&globalflags), IAX_CODEC_NOCAP);
            ast_set_flag((&globalflags), IAX_CODEC_NOPREFS);
         }
      } else if (!strcasecmp(v->name, "jitterbuffer"))
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_USEJITTERBUF); 
      else if (!strcasecmp(v->name, "forcejitterbuffer"))
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_FORCEJITTERBUF);  
      else if (!strcasecmp(v->name, "delayreject"))
         delayreject = ast_true(v->value);
      else if (!strcasecmp(v->name, "allowfwdownload"))
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_ALLOWFWDOWNLOAD);
      else if (!strcasecmp(v->name, "rtcachefriends"))
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_RTCACHEFRIENDS);  
      else if (!strcasecmp(v->name, "rtignoreregexpire"))
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_RTIGNOREREGEXPIRE);  
      else if (!strcasecmp(v->name, "rtupdate"))
         ast_set2_flag((&globalflags), ast_true(v->value), IAX_RTUPDATE);
      else if (!strcasecmp(v->name, "trunktimestamps"))
         ast_set2_flag(&globalflags, ast_true(v->value), IAX_TRUNKTIMESTAMPS);
      else if (!strcasecmp(v->name, "rtautoclear")) {
         int i = atoi(v->value);
         if(i > 0)
            global_rtautoclear = i;
         else
            i = 0;
         ast_set2_flag((&globalflags), i || ast_true(v->value), IAX_RTAUTOCLEAR);   
      } else if (!strcasecmp(v->name, "trunkfreq")) {
         trunkfreq = atoi(v->value);
         if (trunkfreq < 10)
            trunkfreq = 10;
      } else if (!strcasecmp(v->name, "autokill")) {
         if (sscanf(v->value, "%d", &x) == 1) {
            if (x >= 0)
               autokill = x;
            else
               ast_log(LOG_NOTICE, "Nice try, but autokill has to be >0 or 'yes' or 'no' at line %d\n", v->lineno);
         } else if (ast_true(v->value)) {
            autokill = DEFAULT_MAXMS;
         } else {
            autokill = 0;
         }
      } else if (!strcasecmp(v->name, "bandwidth")) {
         if (!strcasecmp(v->value, "low")) {
            capability = IAX_CAPABILITY_LOWBANDWIDTH;
         } else if (!strcasecmp(v->value, "medium")) {
            capability = IAX_CAPABILITY_MEDBANDWIDTH;
         } else if (!strcasecmp(v->value, "high")) {
            capability = IAX_CAPABILITY_FULLBANDWIDTH;
         } else
            ast_log(LOG_WARNING, "bandwidth must be either low, medium, or high\n");
      } else if (!strcasecmp(v->name, "allow")) {
         ast_parse_allow_disallow(&prefs, &capability, v->value, 1);
      } else if (!strcasecmp(v->name, "disallow")) {
         ast_parse_allow_disallow(&prefs, &capability, v->value, 0);
      } else if (!strcasecmp(v->name, "register")) {
         iax2_register(v->value, v->lineno);
      } else if (!strcasecmp(v->name, "iaxcompat")) {
         iaxcompat = ast_true(v->value);
      } else if (!strcasecmp(v->name, "regcontext")) {
         ast_copy_string(regcontext, v->value, sizeof(regcontext));
         /* Create context if it doesn't exist already */
         if (!ast_context_find(regcontext))
            ast_context_create(NULL, regcontext, "IAX2");
      } else if (!strcasecmp(v->name, "tos")) {
         if (ast_str2tos(v->value, &tos))
            ast_log(LOG_WARNING, "Invalid tos value at line %d, see doc/ip-tos.txt for more information.'\n", v->lineno);
      } else if (!strcasecmp(v->name, "accountcode")) {
         ast_copy_string(accountcode, v->value, sizeof(accountcode));
      } else if (!strcasecmp(v->name, "mohinterpret")) {
         ast_copy_string(mohinterpret, v->value, sizeof(user->mohinterpret));
      } else if (!strcasecmp(v->name, "mohsuggest")) {
         ast_copy_string(mohsuggest, v->value, sizeof(user->mohsuggest));
      } else if (!strcasecmp(v->name, "amaflags")) {
         format = ast_cdr_amaflags2int(v->value);
         if (format < 0) {
            ast_log(LOG_WARNING, "Invalid AMA Flags: %s at line %d\n", v->value, v->lineno);
         } else {
            amaflags = format;
         }
      } else if (!strcasecmp(v->name, "language")) {
         ast_copy_string(language, v->value, sizeof(language));
      } else if (!strcasecmp(v->name, "maxauthreq")) {
         maxauthreq = atoi(v->value);
         if (maxauthreq < 0)
            maxauthreq = 0;
      } else if (!strcasecmp(v->name, "adsi")) {
         adsi = ast_true(v->value);
      } /*else if (strcasecmp(v->name,"type")) */
      /* ast_log(LOG_WARNING, "Ignoring %s\n", v->name); */
      v = v->next;
   }
   
   if (defaultsockfd < 0) {
      if (!(ns = ast_netsock_bind(netsock, io, "0.0.0.0", portno, tos, socket_read, NULL))) {
         ast_log(LOG_ERROR, "Unable to create network socket: %s\n", strerror(errno));
      } else {
         if (option_verbose > 1)
            ast_verbose(VERBOSE_PREFIX_2 "Binding IAX2 to default address 0.0.0.0:%d\n", portno);
         defaultsockfd = ast_netsock_sockfd(ns);
         ast_netsock_unref(ns);
      }
   }
   if (reload) {
      ast_netsock_release(outsock);
      outsock = ast_netsock_list_alloc();
      if (!outsock) {
         ast_log(LOG_ERROR, "Could not allocate outsock list.\n");
         return -1;
      }
      ast_netsock_init(outsock);
   }

   if (min_reg_expire > max_reg_expire) {
      ast_log(LOG_WARNING, "Minimum registration interval of %d is more than maximum of %d, resetting minimum to %d\n",
         min_reg_expire, max_reg_expire, max_reg_expire);
      min_reg_expire = max_reg_expire;
   }
   iax2_capability = capability;
   
   ucfg = ast_config_load("users.conf");
   if (ucfg) {
      struct ast_variable *gen;
      int genhasiax;
      int genregisteriax;
      const char *hasiax, *registeriax;
      
      genhasiax = ast_true(ast_variable_retrieve(ucfg, "general", "hasiax"));
      genregisteriax = ast_true(ast_variable_retrieve(ucfg, "general", "registeriax"));
      gen = ast_variable_browse(ucfg, "general");
      cat = ast_category_browse(ucfg, NULL);
      while (cat) {
         if (strcasecmp(cat, "general")) {
            hasiax = ast_variable_retrieve(ucfg, cat, "hasiax");
            registeriax = ast_variable_retrieve(ucfg, cat, "registeriax");
            if (ast_true(hasiax) || (!hasiax && genhasiax)) {
               /* Start with general parameters, then specific parameters, user and peer */
               user = build_user(cat, gen, ast_variable_browse(ucfg, cat), 0);
               if (user) {
                  __ao2_link(users, user, (MAX_PEER_BUCKETS == 1) ? 1 : 0);
                  user = user_unref(user);
               }
               peer = build_peer(cat, gen, ast_variable_browse(ucfg, cat), 0);
               if (peer) {
                  if (ast_test_flag(peer, IAX_DYNAMIC))
                     reg_source_db(peer);
                  __ao2_link(peers, peer, (MAX_PEER_BUCKETS == 1) ? 1 : 0);
                  peer = peer_unref(peer);
               }
            }
            if (ast_true(registeriax) || (!registeriax && genregisteriax)) {
               char tmp[256];
               const char *host = ast_variable_retrieve(ucfg, cat, "host");
               const char *username = ast_variable_retrieve(ucfg, cat, "username");
               const char *secret = ast_variable_retrieve(ucfg, cat, "secret");
               if (!host)
                  host = ast_variable_retrieve(ucfg, "general", "host");
               if (!username)
                  username = ast_variable_retrieve(ucfg, "general", "username");
               if (!secret)
                  secret = ast_variable_retrieve(ucfg, "general", "secret");
               if (!ast_strlen_zero(username) && !ast_strlen_zero(host)) {
                  if (!ast_strlen_zero(secret))
                     snprintf(tmp, sizeof(tmp), "%s:%s@%s", username, secret, host);
                  else
                     snprintf(tmp, sizeof(tmp), "%s@%s", username, host);
                  iax2_register(tmp, 0);
               }
            }
         }
         cat = ast_category_browse(ucfg, cat);
      }
      ast_config_destroy(ucfg);
   }
   
   cat = ast_category_browse(cfg, NULL);
   while(cat) {
      if (strcasecmp(cat, "general")) {
         utype = ast_variable_retrieve(cfg, cat, "type");
         if (utype) {
            if (!strcasecmp(utype, "user") || !strcasecmp(utype, "friend")) {
               user = build_user(cat, ast_variable_browse(cfg, cat), NULL, 0);
               if (user) {
                  __ao2_link(users, user, (MAX_PEER_BUCKETS == 1) ? 1 : 0);
                  user = user_unref(user);
               }
            }
            if (!strcasecmp(utype, "peer") || !strcasecmp(utype, "friend")) {
               peer = build_peer(cat, ast_variable_browse(cfg, cat), NULL, 0);
               if (peer) {
                  if (ast_test_flag(peer, IAX_DYNAMIC))
                     reg_source_db(peer);
                  __ao2_link(peers, peer, (MAX_PEER_BUCKETS == 1) ? 1 : 0);
                  peer = peer_unref(peer);
               }
            } else if (strcasecmp(utype, "user")) {
               ast_log(LOG_WARNING, "Unknown type '%s' for '%s' in %s\n", utype, cat, config_file);
            }
         } else
            ast_log(LOG_WARNING, "Section '%s' lacks type\n", cat);
      }
      cat = ast_category_browse(cfg, cat);
   }
   ast_config_destroy(cfg);
   set_timing();
   return 1;
}

static void poke_all_peers(void)
{
   struct ao2_iterator i;
   struct iax2_peer *peer;

   i = ao2_iterator_init(peers, 0);
   while ((peer = ao2_iterator_next(&i))) {
      iax2_poke_peer(peer, 0);
      peer_unref(peer);
   }
}
static int reload_config(void)
{
   char *config = "iax.conf";
   struct iax2_registry *reg;

   if (set_config(config, 1) > 0) {
      prune_peers();
      prune_users();
      AST_LIST_LOCK(&registrations);
      AST_LIST_TRAVERSE(&registrations, reg, entry)
         iax2_do_register(reg);
      AST_LIST_UNLOCK(&registrations);
      /* Qualify hosts, too */
      poke_all_peers();
   }
   reload_firmware(0);
   iax_provision_reload();

   return 0;
}

static int iax2_reload(int fd, int argc, char *argv[])
{
   return reload_config();
}

static int reload(void)
{
   return reload_config();
}

static int cache_get_callno_locked(const char *data)
{
   struct sockaddr_in sin;
   int x;
   int callno;
   struct iax_ie_data ied;
   struct create_addr_info cai;
   struct parsed_dial_string pds;
   char *tmpstr;

   for (x = 0; x < ARRAY_LEN(iaxs); x++) {
      /* Look for an *exact match* call.  Once a call is negotiated, it can only
         look up entries for a single context */
      if (!ast_mutex_trylock(&iaxsl[x])) {
         if (iaxs[x] && !strcasecmp(data, iaxs[x]->dproot))
            return x;
         ast_mutex_unlock(&iaxsl[x]);
      }
   }

   /* No match found, we need to create a new one */

   memset(&cai, 0, sizeof(cai));
   memset(&ied, 0, sizeof(ied));
   memset(&pds, 0, sizeof(pds));

   tmpstr = ast_strdupa(data);
   parse_dial_string(tmpstr, &pds);

   if (ast_strlen_zero(pds.peer)) {
      ast_log(LOG_WARNING, "No peer provided in the IAX2 dial string '%s'\n", data);
      return -1;
   }

   /* Populate our address from the given */
   if (create_addr(pds.peer, NULL, &sin, &cai))
      return -1;

   if (option_debug)
      ast_log(LOG_DEBUG, "peer: %s, username: %s, password: %s, context: %s\n",
         pds.peer, pds.username, pds.password, pds.context);

   callno = find_callno_locked(0, 0, &sin, NEW_FORCE, cai.sockfd, 0);
   if (callno < 1) {
      ast_log(LOG_WARNING, "Unable to create call\n");
      return -1;
   }

   ast_string_field_set(iaxs[callno], dproot, data);
   iaxs[callno]->capability = IAX_CAPABILITY_FULLBANDWIDTH;

   iax_ie_append_short(&ied, IAX_IE_VERSION, IAX_PROTO_VERSION);
   iax_ie_append_str(&ied, IAX_IE_CALLED_NUMBER, "TBD");
   /* the string format is slightly different from a standard dial string,
      because the context appears in the 'exten' position
   */
   if (pds.exten)
      iax_ie_append_str(&ied, IAX_IE_CALLED_CONTEXT, pds.exten);
   if (pds.username)
      iax_ie_append_str(&ied, IAX_IE_USERNAME, pds.username);
   iax_ie_append_int(&ied, IAX_IE_FORMAT, IAX_CAPABILITY_FULLBANDWIDTH);
   iax_ie_append_int(&ied, IAX_IE_CAPABILITY, IAX_CAPABILITY_FULLBANDWIDTH);
   /* Keep password handy */
   if (pds.password)
      ast_string_field_set(iaxs[callno], secret, pds.password);
   if (pds.key)
      ast_string_field_set(iaxs[callno], outkey, pds.key);
   /* Start the call going */
   send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_NEW, 0, ied.buf, ied.pos, -1);

   return callno;
}

static struct iax2_dpcache *find_cache(struct ast_channel *chan, const char *data, const char *context, const char *exten, int priority)
{
   struct iax2_dpcache *dp, *prev = NULL, *next;
   struct timeval tv;
   int x;
   int com[2];
   int timeout;
   int old=0;
   int outfd;
   int abort;
   int callno;
   struct ast_channel *c;
   struct ast_frame *f;
   gettimeofday(&tv, NULL);
   dp = dpcache;
   while(dp) {
      next = dp->next;
      /* Expire old caches */
      if (ast_tvcmp(tv, dp->expiry) > 0) {
            /* It's expired, let it disappear */
            if (prev)
               prev->next = dp->next;
            else
               dpcache = dp->next;
            if (!dp->peer && !(dp->flags & CACHE_FLAG_PENDING) && !dp->callno) {
               /* Free memory and go again */
               free(dp);
            } else {
               ast_log(LOG_WARNING, "DP still has peer field or pending or callno (flags = %d, peer = %p callno = %d)\n", dp->flags, dp->peer, dp->callno);
            }
            dp = next;
            continue;
      }
      /* We found an entry that matches us! */
      if (!strcmp(dp->peercontext, data) && !strcmp(dp->exten, exten)) 
         break;
      prev = dp;
      dp = next;
   }
   if (!dp) {
      /* No matching entry.  Create a new one. */
      /* First, can we make a callno? */
      callno = cache_get_callno_locked(data);
      if (callno < 0) {
         ast_log(LOG_WARNING, "Unable to generate call for '%s'\n", data);
         return NULL;
      }
      if (!(dp = ast_calloc(1, sizeof(*dp)))) {
         ast_mutex_unlock(&iaxsl[callno]);
         return NULL;
      }
      ast_copy_string(dp->peercontext, data, sizeof(dp->peercontext));
      ast_copy_string(dp->exten, exten, sizeof(dp->exten));
      gettimeofday(&dp->expiry, NULL);
      dp->orig = dp->expiry;
      /* Expires in 30 mins by default */
      dp->expiry.tv_sec += iaxdefaultdpcache;
      dp->next = dpcache;
      dp->flags = CACHE_FLAG_PENDING;
      for (x=0;x<sizeof(dp->waiters) / sizeof(dp->waiters[0]); x++)
         dp->waiters[x] = -1;
      dpcache = dp;
      dp->peer = iaxs[callno]->dpentries;
      iaxs[callno]->dpentries = dp;
      /* Send the request if we're already up */
      if (ast_test_flag(&iaxs[callno]->state, IAX_STATE_STARTED))
         iax2_dprequest(dp, callno);
      ast_mutex_unlock(&iaxsl[callno]);
   }
   /* By here we must have a dp */
   if (dp->flags & CACHE_FLAG_PENDING) {
      /* Okay, here it starts to get nasty.  We need a pipe now to wait
         for a reply to come back so long as it's pending */
      for (x=0;x<sizeof(dp->waiters) / sizeof(dp->waiters[0]); x++) {
         /* Find an empty slot */
         if (dp->waiters[x] < 0)
            break;
      }
      if (x >= sizeof(dp->waiters) / sizeof(dp->waiters[0])) {
         ast_log(LOG_WARNING, "No more waiter positions available\n");
         return NULL;
      }
      if (pipe(com)) {
         ast_log(LOG_WARNING, "Unable to create pipe for comm\n");
         return NULL;
      }
      dp->waiters[x] = com[1];
      /* Okay, now we wait */
      timeout = iaxdefaulttimeout * 1000;
      /* Temporarily unlock */
      ast_mutex_unlock(&dpcache_lock);
      /* Defer any dtmf */
      if (chan)
         old = ast_channel_defer_dtmf(chan);
      abort = 0;
      while(timeout) {
         c = ast_waitfor_nandfds(&chan, chan ? 1 : 0, &com[0], 1, NULL, &outfd, &timeout);
         if (outfd > -1) {
            break;
         }
         if (c) {
            f = ast_read(c);
            if (f)
               ast_frfree(f);
            else {
               /* Got hung up on, abort! */
               break;
               abort = 1;
            }
         }
      }
      if (!timeout) {
         ast_log(LOG_WARNING, "Timeout waiting for %s exten %s\n", data, exten);
      }
      ast_mutex_lock(&dpcache_lock);
      dp->waiters[x] = -1;
      close(com[1]);
      close(com[0]);
      if (abort) {
         /* Don't interpret anything, just abort.  Not sure what th epoint
           of undeferring dtmf on a hung up channel is but hey whatever */
         if (!old && chan)
            ast_channel_undefer_dtmf(chan);
         return NULL;
      }
      if (!(dp->flags & CACHE_FLAG_TIMEOUT)) {
         /* Now to do non-independent analysis the results of our wait */
         if (dp->flags & CACHE_FLAG_PENDING) {
            /* Still pending... It's a timeout.  Wake everybody up.  Consider it no longer
               pending.  Don't let it take as long to timeout. */
            dp->flags &= ~CACHE_FLAG_PENDING;
            dp->flags |= CACHE_FLAG_TIMEOUT;
            /* Expire after only 60 seconds now.  This is designed to help reduce backlog in heavily loaded
               systems without leaving it unavailable once the server comes back online */
            dp->expiry.tv_sec = dp->orig.tv_sec + 60;
            for (x=0;x<sizeof(dp->waiters) / sizeof(dp->waiters[0]); x++)
               if (dp->waiters[x] > -1)
                  write(dp->waiters[x], "asdf", 4);
         }
      }
      /* Our caller will obtain the rest */
      if (!old && chan)
         ast_channel_undefer_dtmf(chan);
   }
   return dp;  
}

/*! \brief Part of the IAX2 switch interface */
static int iax2_exists(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
{
   struct iax2_dpcache *dp;
   int res = 0;
#if 0
   ast_log(LOG_NOTICE, "iax2_exists: con: %s, exten: %s, pri: %d, cid: %s, data: %s\n", context, exten, priority, callerid ? callerid : "<unknown>", data);
#endif
   if ((priority != 1) && (priority != 2))
      return 0;
   ast_mutex_lock(&dpcache_lock);
   dp = find_cache(chan, data, context, exten, priority);
   if (dp) {
      if (dp->flags & CACHE_FLAG_EXISTS)
         res= 1;
   }
   ast_mutex_unlock(&dpcache_lock);
   if (!dp) {
      ast_log(LOG_WARNING, "Unable to make DP cache\n");
   }
   return res;
}

/*! \brief part of the IAX2 dial plan switch interface */
static int iax2_canmatch(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
{
   int res = 0;
   struct iax2_dpcache *dp;
#if 0
   ast_log(LOG_NOTICE, "iax2_canmatch: con: %s, exten: %s, pri: %d, cid: %s, data: %s\n", context, exten, priority, callerid ? callerid : "<unknown>", data);
#endif
   if ((priority != 1) && (priority != 2))
      return 0;
   ast_mutex_lock(&dpcache_lock);
   dp = find_cache(chan, data, context, exten, priority);
   if (dp) {
      if (dp->flags & CACHE_FLAG_CANEXIST)
         res= 1;
   }
   ast_mutex_unlock(&dpcache_lock);
   if (!dp) {
      ast_log(LOG_WARNING, "Unable to make DP cache\n");
   }
   return res;
}

/*! \brief Part of the IAX2 Switch interface */
static int iax2_matchmore(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
{
   int res = 0;
   struct iax2_dpcache *dp;
#if 0
   ast_log(LOG_NOTICE, "iax2_matchmore: con: %s, exten: %s, pri: %d, cid: %s, data: %s\n", context, exten, priority, callerid ? callerid : "<unknown>", data);
#endif
   if ((priority != 1) && (priority != 2))
      return 0;
   ast_mutex_lock(&dpcache_lock);
   dp = find_cache(chan, data, context, exten, priority);
   if (dp) {
      if (dp->flags & CACHE_FLAG_MATCHMORE)
         res= 1;
   }
   ast_mutex_unlock(&dpcache_lock);
   if (!dp) {
      ast_log(LOG_WARNING, "Unable to make DP cache\n");
   }
   return res;
}

/*! \brief Execute IAX2 dialplan switch */
static int iax2_exec(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
{
   char odata[256];
   char req[256];
   char *ncontext;
   struct iax2_dpcache *dp;
   struct ast_app *dial;
#if 0
   ast_log(LOG_NOTICE, "iax2_exec: con: %s, exten: %s, pri: %d, cid: %s, data: %s, newstack: %d\n", context, exten, priority, callerid ? callerid : "<unknown>", data, newstack);
#endif
   if (priority == 2) {
      /* Indicate status, can be overridden in dialplan */
      const char *dialstatus = pbx_builtin_getvar_helper(chan, "DIALSTATUS");
      if (dialstatus) {
         dial = pbx_findapp(dialstatus);
         if (dial) 
            pbx_exec(chan, dial, "");
      }
      return -1;
   } else if (priority != 1)
      return -1;
   ast_mutex_lock(&dpcache_lock);
   dp = find_cache(chan, data, context, exten, priority);
   if (dp) {
      if (dp->flags & CACHE_FLAG_EXISTS) {
         ast_copy_string(odata, data, sizeof(odata));
         ncontext = strchr(odata, '/');
         if (ncontext) {
            *ncontext = '\0';
            ncontext++;
            snprintf(req, sizeof(req), "IAX2/%s/%s@%s", odata, exten, ncontext);
         } else {
            snprintf(req, sizeof(req), "IAX2/%s/%s", odata, exten);
         }
         if (option_verbose > 2)
            ast_verbose(VERBOSE_PREFIX_3 "Executing Dial('%s')\n", req);
      } else {
         ast_mutex_unlock(&dpcache_lock);
         ast_log(LOG_WARNING, "Can't execute nonexistent extension '%s[@%s]' in data '%s'\n", exten, context, data);
         return -1;
      }
   }
   ast_mutex_unlock(&dpcache_lock);
   dial = pbx_findapp("Dial");
   if (dial) {
      return pbx_exec(chan, dial, req);
   } else {
      ast_log(LOG_WARNING, "No dial application registered\n");
   }
   return -1;
}

static int function_iaxpeer(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
{
   struct iax2_peer *peer;
   char *peername, *colname;

   peername = ast_strdupa(data);

   /* if our channel, return the IP address of the endpoint of current channel */
   if (!strcmp(peername,"CURRENTCHANNEL")) {
           unsigned short callno;
      if (chan->tech != &iax2_tech)
         return -1;
      callno = PTR_TO_CALLNO(chan->tech_pvt);   
      ast_copy_string(buf, iaxs[callno]->addr.sin_addr.s_addr ? ast_inet_ntoa(iaxs[callno]->addr.sin_addr) : "", len);
      return 0;
   }

   if ((colname = strchr(peername, ':'))) /*! \todo : will be removed after the 1.4 relese */
      *colname++ = '\0';
   else if ((colname = strchr(peername, '|')))
      *colname++ = '\0';
   else
      colname = "ip";

   if (!(peer = find_peer(peername, 1)))
      return -1;

   if (!strcasecmp(colname, "ip")) {
      ast_copy_string(buf, peer->addr.sin_addr.s_addr ? ast_inet_ntoa(peer->addr.sin_addr) : "", len);
   } else  if (!strcasecmp(colname, "status")) {
      peer_status(peer, buf, len); 
   } else  if (!strcasecmp(colname, "mailbox")) {
      ast_copy_string(buf, peer->mailbox, len);
   } else  if (!strcasecmp(colname, "context")) {
      ast_copy_string(buf, peer->context, len);
   } else  if (!strcasecmp(colname, "expire")) {
      snprintf(buf, len, "%d", peer->expire);
   } else  if (!strcasecmp(colname, "dynamic")) {
      ast_copy_string(buf, (ast_test_flag(peer, IAX_DYNAMIC) ? "yes" : "no"), len);
   } else  if (!strcasecmp(colname, "callerid_name")) {
      ast_copy_string(buf, peer->cid_name, len);
   } else  if (!strcasecmp(colname, "callerid_num")) {
      ast_copy_string(buf, peer->cid_num, len);
   } else  if (!strcasecmp(colname, "codecs")) {
      ast_getformatname_multiple(buf, len -1, peer->capability);
   } else  if (!strncasecmp(colname, "codec[", 6)) {
      char *codecnum, *ptr;
      int index = 0, codec = 0;
      
      codecnum = strchr(colname, '[');
      *codecnum = '\0';
      codecnum++;
      if ((ptr = strchr(codecnum, ']'))) {
         *ptr = '\0';
      }
      index = atoi(codecnum);
      if((codec = ast_codec_pref_index(&peer->prefs, index))) {
         ast_copy_string(buf, ast_getformatname(codec), len);
      }
   }

   peer_unref(peer);

   return 0;
}

struct ast_custom_function iaxpeer_function = {
   .name = "IAXPEER",
   .synopsis = "Gets IAX peer information",
   .syntax = "IAXPEER(<peername|CURRENTCHANNEL>[|item])",
   .read = function_iaxpeer,
   .desc = "If peername specified, valid items are:\n"
   "- ip (default)          The IP address.\n"
   "- status                The peer's status (if qualify=yes)\n"
   "- mailbox               The configured mailbox.\n"
   "- context               The configured context.\n"
   "- expire                The epoch time of the next expire.\n"
   "- dynamic               Is it dynamic? (yes/no).\n"
   "- callerid_name         The configured Caller ID name.\n"
   "- callerid_num          The configured Caller ID number.\n"
   "- codecs                The configured codecs.\n"
   "- codec[x]              Preferred codec index number 'x' (beginning with zero).\n"
   "\n"
   "If CURRENTCHANNEL specified, returns IP address of current channel\n"
   "\n"
};


/*! \brief Part of the device state notification system ---*/
static int iax2_devicestate(void *data) 
{
   struct parsed_dial_string pds;
   char *tmp = ast_strdupa(data);
   struct iax2_peer *p;
   int res = AST_DEVICE_INVALID;

   memset(&pds, 0, sizeof(pds));
   parse_dial_string(tmp, &pds);

   if (ast_strlen_zero(pds.peer)) {
      ast_log(LOG_WARNING, "No peer provided in the IAX2 dial string '%s'\n", (char *) data);
      return res;
   }
   
   if (option_debug > 2)
      ast_log(LOG_DEBUG, "Checking device state for device %s\n", pds.peer);

   /* SLD: FIXME: second call to find_peer during registration */
   if (!(p = find_peer(pds.peer, 1)))
      return res;

   res = AST_DEVICE_UNAVAILABLE;
   if (option_debug > 2) 
      ast_log(LOG_DEBUG, "iax2_devicestate: Found peer. What's device state of %s? addr=%d, defaddr=%d maxms=%d, lastms=%d\n",
         pds.peer, p->addr.sin_addr.s_addr, p->defaddr.sin_addr.s_addr, p->maxms, p->lastms);
   
   if ((p->addr.sin_addr.s_addr || p->defaddr.sin_addr.s_addr) &&
       (!p->maxms || ((p->lastms > -1) && (p->historicms <= p->maxms)))) {
      /* Peer is registered, or have default IP address
         and a valid registration */
      if (p->historicms == 0 || p->historicms <= p->maxms)
         /* let the core figure out whether it is in use or not */
         res = AST_DEVICE_UNKNOWN;  
   }

   peer_unref(p);

   return res;
}

static struct ast_switch iax2_switch = 
{
   name:          "IAX2",
   description:      "IAX Remote Dialplan Switch",
   exists:        iax2_exists,
   canmatch:      iax2_canmatch,
   exec:       iax2_exec,
   matchmore:     iax2_matchmore,
};

static char show_stats_usage[] =
"Usage: iax2 show stats\n"
"       Display statistics on IAX channel driver.\n";

static char show_cache_usage[] =
"Usage: iax2 show cache\n"
"       Display currently cached IAX Dialplan results.\n";

static char show_peer_usage[] =
"Usage: iax2 show peer <name>\n"
"       Display details on specific IAX peer\n";

static char prune_realtime_usage[] =
"Usage: iax2 prune realtime [<peername>|all]\n"
"       Prunes object(s) from the cache\n";

static char iax2_reload_usage[] =
"Usage: iax2 reload\n"
"       Reloads IAX configuration from iax.conf\n";

static char show_prov_usage[] =
"Usage: iax2 provision <host> <template> [forced]\n"
"       Provisions the given peer or IP address using a template\n"
"       matching either 'template' or '*' if the template is not\n"
"       found.  If 'forced' is specified, even empty provisioning\n"
"       fields will be provisioned as empty fields.\n";

static char show_users_usage[] = 
"Usage: iax2 show users [like <pattern>]\n"
"       Lists all known IAX2 users.\n"
"       Optional regular expression pattern is used to filter the user list.\n";

static char show_channels_usage[] = 
"Usage: iax2 show channels\n"
"       Lists all currently active IAX channels.\n";

static char show_netstats_usage[] = 
"Usage: iax2 show netstats\n"
"       Lists network status for all currently active IAX channels.\n";

static char show_threads_usage[] = 
"Usage: iax2 show threads\n"
"       Lists status of IAX helper threads\n";

static char show_peers_usage[] = 
"Usage: iax2 show peers [registered] [like <pattern>]\n"
"       Lists all known IAX2 peers.\n"
"       Optional 'registered' argument lists only peers with known addresses.\n"
"       Optional regular expression pattern is used to filter the peer list.\n";

static char show_firmware_usage[] = 
"Usage: iax2 show firmware\n"
"       Lists all known IAX firmware images.\n";

static char show_reg_usage[] =
"Usage: iax2 show registry\n"
"       Lists all registration requests and status.\n";

static char debug_usage[] = 
"Usage: iax2 set debug\n"
"       Enables dumping of IAX packets for debugging purposes\n";

static char no_debug_usage[] = 
"Usage: iax2 set debug off\n"
"       Disables dumping of IAX packets for debugging purposes\n";

static char debug_trunk_usage[] =
"Usage: iax2 set debug trunk\n"
"       Requests current status of IAX trunking\n";

static char no_debug_trunk_usage[] =
"Usage: iax2 set debug trunk off\n"
"       Requests current status of IAX trunking\n";

static char debug_jb_usage[] =
"Usage: iax2 set debug jb\n"
"       Enables jitterbuffer debugging information\n";

static char no_debug_jb_usage[] =
"Usage: iax2 set debug jb off\n"
"       Disables jitterbuffer debugging information\n";

static char iax2_test_losspct_usage[] =
"Usage: iax2 test losspct <percentage>\n"
"       For testing, throws away <percentage> percent of incoming packets\n";

#ifdef IAXTESTS
static char iax2_test_late_usage[] =
"Usage: iax2 test late <ms>\n"
"       For testing, count the next frame as <ms> ms late\n";

static char iax2_test_resync_usage[] =
"Usage: iax2 test resync <ms>\n"
"       For testing, adjust all future frames by <ms> ms\n";

static char iax2_test_jitter_usage[] =
"Usage: iax2 test jitter <ms> <pct>\n"
"       For testing, simulate maximum jitter of +/- <ms> on <pct> percentage of packets. If <pct> is not specified, adds jitter to all packets.\n";
#endif /* IAXTESTS */

static struct ast_cli_entry cli_iax2_trunk_debug_deprecated = {
   { "iax2", "trunk", "debug", NULL },
   iax2_do_trunk_debug, NULL,
   NULL };

static struct ast_cli_entry cli_iax2_jb_debug_deprecated = {
   { "iax2", "jb", "debug", NULL },
   iax2_do_jb_debug, NULL,
   NULL };

static struct ast_cli_entry cli_iax2_no_debug_deprecated = {
   { "iax2", "no", "debug", NULL },
   iax2_no_debug, NULL,
   NULL };

static struct ast_cli_entry cli_iax2_no_trunk_debug_deprecated = {
   { "iax2", "no", "trunk", "debug", NULL },
   iax2_no_trunk_debug, NULL,
   NULL };

static struct ast_cli_entry cli_iax2_no_jb_debug_deprecated = {
   { "iax2", "no", "jb", "debug", NULL },
   iax2_no_jb_debug, NULL,
   NULL };

static struct ast_cli_entry cli_iax2[] = {
   { { "iax2", "show", "cache", NULL },
   iax2_show_cache, "Display IAX cached dialplan",
   show_cache_usage, NULL, },

   { { "iax2", "show", "channels", NULL },
   iax2_show_channels, "List active IAX channels",
   show_channels_usage, NULL, },

   { { "iax2", "show", "firmware", NULL },
   iax2_show_firmware, "List available IAX firmwares",
   show_firmware_usage, NULL, },

   { { "iax2", "show", "netstats", NULL },
   iax2_show_netstats, "List active IAX channel netstats",
   show_netstats_usage, NULL, },

   { { "iax2", "show", "peers", NULL },
   iax2_show_peers, "List defined IAX peers",
   show_peers_usage, NULL, },

   { { "iax2", "show", "registry", NULL },
   iax2_show_registry, "Display IAX registration status",
   show_reg_usage, NULL, },

   { { "iax2", "show", "stats", NULL },
   iax2_show_stats, "Display IAX statistics",
   show_stats_usage, NULL, },

   { { "iax2", "show", "threads", NULL },
   iax2_show_threads, "Display IAX helper thread info",
   show_threads_usage, NULL, },

   { { "iax2", "show", "users", NULL },
   iax2_show_users, "List defined IAX users",
   show_users_usage, NULL, },

   { { "iax2", "prune", "realtime", NULL },
   iax2_prune_realtime, "Prune a cached realtime lookup",
   prune_realtime_usage, complete_iax2_show_peer },

   { { "iax2", "reload", NULL },
   iax2_reload, "Reload IAX configuration",
   iax2_reload_usage },

   { { "iax2", "show", "peer", NULL },
   iax2_show_peer, "Show details on specific IAX peer",
   show_peer_usage, complete_iax2_show_peer },

   { { "iax2", "set", "debug", NULL },
   iax2_do_debug, "Enable IAX debugging",
   debug_usage },

   { { "iax2", "set", "debug", "trunk", NULL },
   iax2_do_trunk_debug, "Enable IAX trunk debugging",
   debug_trunk_usage, NULL, &cli_iax2_trunk_debug_deprecated },

   { { "iax2", "set", "debug", "jb", NULL },
   iax2_do_jb_debug, "Enable IAX jitterbuffer debugging",
   debug_jb_usage, NULL, &cli_iax2_jb_debug_deprecated },

   { { "iax2", "set", "debug", "off", NULL },
   iax2_no_debug, "Disable IAX debugging",
   no_debug_usage, NULL, &cli_iax2_no_debug_deprecated },

   { { "iax2", "set", "debug", "trunk", "off", NULL },
   iax2_no_trunk_debug, "Disable IAX trunk debugging",
   no_debug_trunk_usage, NULL, &cli_iax2_no_trunk_debug_deprecated },

   { { "iax2", "set", "debug", "jb", "off", NULL },
   iax2_no_jb_debug, "Disable IAX jitterbuffer debugging",
   no_debug_jb_usage, NULL, &cli_iax2_no_jb_debug_deprecated },

   { { "iax2", "test", "losspct", NULL },
   iax2_test_losspct, "Set IAX2 incoming frame loss percentage",
   iax2_test_losspct_usage },

   { { "iax2", "provision", NULL },
   iax2_prov_cmd, "Provision an IAX device",
   show_prov_usage, iax2_prov_complete_template_3rd },

#ifdef IAXTESTS
   { { "iax2", "test", "late", NULL },
   iax2_test_late, "Test the receipt of a late frame",
   iax2_test_late_usage },

   { { "iax2", "test", "resync", NULL },
   iax2_test_resync, "Test a resync in received timestamps",
   iax2_test_resync_usage },

   { { "iax2", "test", "jitter", NULL },
   iax2_test_jitter, "Simulates jitter for testing",
   iax2_test_jitter_usage },
#endif /* IAXTESTS */
};

static int __unload_module(void)
{
   struct iax2_thread *thread = NULL;
   int x;

   /* Make sure threads do not hold shared resources when they are canceled */
   
   /* Grab the sched lock resource to keep it away from threads about to die */
   /* Cancel the network thread, close the net socket */
   if (netthreadid != AST_PTHREADT_NULL) {
      AST_LIST_LOCK(&iaxq.queue);
      ast_mutex_lock(&sched_lock);
      pthread_cancel(netthreadid);
      ast_cond_signal(&sched_cond);
      ast_mutex_unlock(&sched_lock);   /* Release the schedule lock resource */
      AST_LIST_UNLOCK(&iaxq.queue);
      pthread_join(netthreadid, NULL);
   }
   if (schedthreadid != AST_PTHREADT_NULL) {
      ast_mutex_lock(&sched_lock);  
      pthread_cancel(schedthreadid);
      ast_cond_signal(&sched_cond);
      ast_mutex_unlock(&sched_lock);   
      pthread_join(schedthreadid, NULL);
   }
   
   /* Call for all threads to halt */
   AST_LIST_LOCK(&idle_list);
   AST_LIST_TRAVERSE_SAFE_BEGIN(&idle_list, thread, list) {
      AST_LIST_REMOVE_CURRENT(&idle_list, list);
      pthread_cancel(thread->threadid);
   }
   AST_LIST_TRAVERSE_SAFE_END
   AST_LIST_UNLOCK(&idle_list);

   AST_LIST_LOCK(&active_list);
   AST_LIST_TRAVERSE_SAFE_BEGIN(&active_list, thread, list) {
      AST_LIST_REMOVE_CURRENT(&active_list, list);
      pthread_cancel(thread->threadid);
   }
   AST_LIST_TRAVERSE_SAFE_END
   AST_LIST_UNLOCK(&active_list);

   AST_LIST_LOCK(&dynamic_list);
        AST_LIST_TRAVERSE_SAFE_BEGIN(&dynamic_list, thread, list) {
      AST_LIST_REMOVE_CURRENT(&dynamic_list, list);
      pthread_cancel(thread->threadid);
        }
   AST_LIST_TRAVERSE_SAFE_END
        AST_LIST_UNLOCK(&dynamic_list);

   AST_LIST_HEAD_DESTROY(&iaxq.queue);

   /* Wait for threads to exit */
   while(0 < iaxactivethreadcount)
      usleep(10000);
   
   ast_netsock_release(netsock);
   ast_netsock_release(outsock);
   for (x = 0; x < ARRAY_LEN(iaxs); x++) {
      if (iaxs[x]) {
         iax2_destroy(x);
      }
   }
   ast_manager_unregister( "IAXpeers" );
   ast_manager_unregister( "IAXnetstats" );
   ast_unregister_application(papp);
   ast_cli_unregister_multiple(cli_iax2, sizeof(cli_iax2) / sizeof(struct ast_cli_entry));
   ast_unregister_switch(&iax2_switch);
   ast_channel_unregister(&iax2_tech);
   delete_users();
   iax_provision_unload();
   sched_context_destroy(sched);
   reload_firmware(1);

   ast_mutex_destroy(&waresl.lock);

   for (x = 0; x < ARRAY_LEN(iaxsl); x++) {
      ast_mutex_destroy(&iaxsl[x]);
   }

   ao2_ref(peers, -1);
   ao2_ref(users, -1);
   ao2_ref(iax_peercallno_pvts, -1);

   return 0;
}

static int unload_module(void)
{
   ast_custom_function_unregister(&iaxpeer_function);
   return __unload_module();
}

static int peer_set_sock_cb(void *obj, void *arg, int flags)
{
   struct iax2_peer *peer = obj;

   if (peer->sockfd < 0)
      peer->sockfd = defaultsockfd;

   return 0;
}

static int pvt_hash_cb(const void *obj, const int flags)
{
   const struct chan_iax2_pvt *pvt = obj;

   return pvt->peercallno;
}

static int pvt_cmp_cb(void *obj, void *arg, int flags)
{
   struct chan_iax2_pvt *pvt = obj, *pvt2 = arg;

   /* The frames_received field is used to hold whether we're matching
    * against a full frame or not ... */

   return match(&pvt2->addr, pvt2->peercallno, pvt2->callno, pvt, 
      pvt2->frames_received) ? CMP_MATCH : 0;
}

/*! \brief Load IAX2 module, load configuraiton ---*/
static int load_module(void)
{
   char *config = "iax.conf";
   int res = 0;
   int x;
   struct iax2_registry *reg = NULL;

   peers = ao2_container_alloc(MAX_PEER_BUCKETS, peer_hash_cb, peer_cmp_cb);
   if (!peers)
      return AST_MODULE_LOAD_FAILURE;
   users = ao2_container_alloc(MAX_USER_BUCKETS, user_hash_cb, user_cmp_cb);
   if (!users) {
      ao2_ref(peers, -1);
      return AST_MODULE_LOAD_FAILURE;
   }
   iax_peercallno_pvts = ao2_container_alloc(IAX_MAX_CALLS, pvt_hash_cb, pvt_cmp_cb);
   if (!iax_peercallno_pvts) {
      ao2_ref(peers, -1);
      ao2_ref(users, -1);
      return AST_MODULE_LOAD_FAILURE;
   }

   ast_custom_function_register(&iaxpeer_function);

   iax_set_output(iax_debug_output);
   iax_set_error(iax_error_output);
   jb_setoutput(jb_error_output, jb_warning_output, NULL);
   
#ifdef HAVE_ZAPTEL
#ifdef ZT_TIMERACK
   timingfd = open("/dev/zap/timer", O_RDWR);
   if (timingfd < 0)
#endif
      timingfd = open("/dev/zap/pseudo", O_RDWR);
   if (timingfd < 0) 
      ast_log(LOG_WARNING, "Unable to open IAX timing interface: %s\n", strerror(errno));
#endif      

   memset(iaxs, 0, sizeof(iaxs));

   for (x = 0; x < ARRAY_LEN(iaxsl); x++) {
      ast_mutex_init(&iaxsl[x]);
   }
   
   ast_cond_init(&sched_cond, NULL);

   io = io_context_create();
   sched = sched_context_create();
   
   if (!io || !sched) {
      ast_log(LOG_ERROR, "Out of memory\n");
      return -1;
   }

   netsock = ast_netsock_list_alloc();
   if (!netsock) {
      ast_log(LOG_ERROR, "Could not allocate netsock list.\n");
      return -1;
   }
   ast_netsock_init(netsock);

   outsock = ast_netsock_list_alloc();
   if (!outsock) {
      ast_log(LOG_ERROR, "Could not allocate outsock list.\n");
      return -1;
   }
   ast_netsock_init(outsock);

   ast_mutex_init(&waresl.lock);

   AST_LIST_HEAD_INIT(&iaxq.queue);
   
   ast_cli_register_multiple(cli_iax2, sizeof(cli_iax2) / sizeof(struct ast_cli_entry));

   ast_register_application(papp, iax2_prov_app, psyn, pdescrip);
   
   ast_manager_register( "IAXpeers", 0, manager_iax2_show_peers, "List IAX Peers" );
   ast_manager_register( "IAXnetstats", 0, manager_iax2_show_netstats, "Show IAX Netstats" );

   if(set_config(config, 0) == -1)
      return AST_MODULE_LOAD_DECLINE;

   if (ast_channel_register(&iax2_tech)) {
      ast_log(LOG_ERROR, "Unable to register channel class %s\n", "IAX2");
      __unload_module();
      return -1;
   }

   if (ast_register_switch(&iax2_switch)) 
      ast_log(LOG_ERROR, "Unable to register IAX switch\n");

   res = start_network_thread();
   if (!res) {
      if (option_verbose > 1) 
         ast_verbose(VERBOSE_PREFIX_2 "IAX Ready and Listening\n");
   } else {
      ast_log(LOG_ERROR, "Unable to start network thread\n");
      ast_netsock_release(netsock);
      ast_netsock_release(outsock);
   }

   AST_LIST_LOCK(&registrations);
   AST_LIST_TRAVERSE(&registrations, reg, entry)
      iax2_do_register(reg);
   AST_LIST_UNLOCK(&registrations); 

   ao2_callback(peers, 0, peer_set_sock_cb, NULL);
   ao2_callback(peers, 0, iax2_poke_peer_cb, NULL);

   reload_firmware(0);
   iax_provision_reload();
   return res;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Inter Asterisk eXchange (Ver 2)",
      .load = load_module,
      .unload = unload_module,
      .reload = reload,
          );