chan_h323.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005
 *
 * OpenH323 Channel Driver for ASTERISK PBX.
 *       By Jeremy McNamara
 *                      For The NuFone Network
 *
 * chan_h323 has been derived from code created by
 *               Michael Manousos and Mark Spencer
 *
 * 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.
 *
 * 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 This file is part of the chan_h323 driver for Asterisk
 *
 * \author Jeremy McNamara
 *
 * \par See also
 * \arg Config_h323
 * \extref OpenH323 http://www.voxgratia.org/
 *
 * \ingroup channel_drivers
 */

/*** MODULEINFO
   <depend>openh323</depend>
   <defaultenabled>yes</defaultenabled>
 ***/

#ifdef __cplusplus
extern "C" {
#endif

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 191223 $")

#ifdef __cplusplus
}
#endif

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/param.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netdb.h>
#include <fcntl.h>

#ifdef __cplusplus
extern "C" {
#endif

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/musiconhold.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/rtp.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/cli.h"
#include "asterisk/dsp.h"
#include "asterisk/causes.h"
#include "asterisk/stringfields.h"
#include "asterisk/abstract_jb.h"
#include "asterisk/astobj.h"

#ifdef __cplusplus
}
#endif

#undef open
#undef close
#include "h323/chan_h323.h"

receive_digit_cb on_receive_digit;
on_rtp_cb on_external_rtp_create;
start_rtp_cb on_start_rtp_channel;
setup_incoming_cb on_incoming_call;
setup_outbound_cb on_outgoing_call;
chan_ringing_cb   on_chan_ringing;
con_established_cb on_connection_established;
clear_con_cb on_connection_cleared;
answer_call_cb on_answer_call;
progress_cb on_progress;
rfc2833_cb on_set_rfc2833_payload;
hangup_cb on_hangup;
setcapabilities_cb on_setcapabilities;
setpeercapabilities_cb on_setpeercapabilities;
onhold_cb on_hold;

int h323debug; /*!< global debug flag */

/*! \brief Global jitterbuffer configuration - by default, jb is disabled */
static struct ast_jb_conf default_jbconf =
{
   .flags = 0,
   .max_size = -1,
   .resync_threshold = -1,
   .impl = ""
};
static struct ast_jb_conf global_jbconf;

/** Variables required by Asterisk */
static const char tdesc[] = "The NuFone Network's Open H.323 Channel Driver";
static const char config[] = "h323.conf";
static char default_context[AST_MAX_CONTEXT] = "default";
static struct sockaddr_in bindaddr;

#define GLOBAL_CAPABILITY (AST_FORMAT_G723_1 | AST_FORMAT_GSM | AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_G729A | AST_FORMAT_G726_AAL2 | AST_FORMAT_H261)

/** H.323 configuration values */
static int h323_signalling_port = 1720;
static char gatekeeper[100];
static int gatekeeper_disable = 1;
static int gatekeeper_discover = 0;
static int gkroute = 0;
/* Find user by alias (h.323 id) is default, alternative is the incomming call's source IP address*/
static int userbyalias = 1;
static int acceptAnonymous = 1;
static unsigned int tos = 0;
static unsigned int cos = 0;
static char secret[50];
static unsigned int unique = 0;

static call_options_t global_options;

/*! \brief Private structure of a OpenH323 channel */
struct oh323_pvt {
   ast_mutex_t lock;       /*!< Channel private lock */
   call_options_t options;       /*!<!< Options to be used during call setup */
   int alreadygone;        /*!< Whether or not we've already been destroyed by our peer */
   int needdestroy;        /*!< if we need to be destroyed */
   call_details_t cd;         /*!< Call details */
   struct ast_channel *owner;    /*!< Who owns us */
   struct sockaddr_in sa;        /*!< Our peer */
   struct sockaddr_in redirip;      /*!< Where our RTP should be going if not to us */
   int nonCodecCapability;       /*!< non-audio capability */
   int outgoing;           /*!< Outgoing or incoming call? */
   char exten[AST_MAX_EXTENSION];      /*!< Requested extension */
   char context[AST_MAX_CONTEXT];      /*!< Context where to start */
   char accountcode[256];        /*!< Account code */
   char rdnis[80];            /*!< Referring DNIS, if available */
   int amaflags;           /*!< AMA Flags */
   struct ast_rtp *rtp;       /*!< RTP Session */
   struct ast_dsp *vad;       /*!< Used for in-band DTMF detection */
   int nativeformats;         /*!< Codec formats supported by a channel */
   int needhangup;            /*!< Send hangup when Asterisk is ready */
   int hangupcause;        /*!< Hangup cause from OpenH323 layer */
   int newstate;           /*!< Pending state change */
   int newcontrol;            /*!< Pending control to send */
   int newdigit;           /*!< Pending DTMF digit to send */
   int newduration;        /*!< Pending DTMF digit duration to send */
   int pref_codec;            /*!< Preferred codec */
   int peercapability;        /*!< Capabilities learned from peer */
   int jointcapability;       /*!< Common capabilities for local and remote side */
   struct ast_codec_pref peer_prefs;   /*!< Preferenced list of codecs which remote side supports */
   int dtmf_pt[2];            /*!< Payload code used for RFC2833/CISCO messages */
   int curDTMF;            /*!< DTMF tone being generated to Asterisk side */
   int DTMFsched;          /*!< Scheduler descriptor for DTMF */
   int update_rtp_info;       /*!< Configuration of fd's array is pending */
   int recvonly;           /*!< Peer isn't wish to receive our voice stream */
   int txDtmfDigit;        /*!< DTMF digit being to send to H.323 side */
   int noInbandDtmf;       /*!< Inband DTMF processing by DSP isn't available */
   int connection_established;      /*!< Call got CONNECT message */
   int got_progress;       /*!< Call got PROGRESS message, pass inband audio */
   struct oh323_pvt *next;       /*!< Next channel in list */
} *iflist = NULL;

/*! \brief H323 User list */
static struct h323_user_list {
   ASTOBJ_CONTAINER_COMPONENTS(struct oh323_user);
} userl;

/*! \brief H323 peer list */
static struct h323_peer_list {
   ASTOBJ_CONTAINER_COMPONENTS(struct oh323_peer);
} peerl;

/*! \brief H323 alias list */
static struct h323_alias_list {
   ASTOBJ_CONTAINER_COMPONENTS(struct oh323_alias);
} aliasl;

/* Asterisk RTP stuff */
static struct sched_context *sched;
static struct io_context *io;

AST_MUTEX_DEFINE_STATIC(iflock); /*!< Protect the interface list (oh323_pvt) */

/*! \brief  Protect the H.323 monitoring thread, so only one process can kill or start it, and not
   when it's doing something critical. */
AST_MUTEX_DEFINE_STATIC(monlock);

/*! \brief Protect the H.323 capabilities list, to avoid more than one channel to set the capabilities simultaneaously in the h323 stack. */
AST_MUTEX_DEFINE_STATIC(caplock);

/*! \brief Protect the reload process */
AST_MUTEX_DEFINE_STATIC(h323_reload_lock);
static int h323_reloading = 0;

/*! \brief This is the thread for the monitor which checks for input on the channels
   which are not currently in use. */
static pthread_t monitor_thread = AST_PTHREADT_NULL;
static int restart_monitor(void);
static int h323_do_reload(void);

static void delete_users(void);
static void delete_aliases(void);
static void prune_peers(void);

static struct ast_channel *oh323_request(const char *type, int format, void *data, int *cause);
static int oh323_digit_begin(struct ast_channel *c, char digit);
static int oh323_digit_end(struct ast_channel *c, char digit, unsigned int duration);
static int oh323_call(struct ast_channel *c, char *dest, int timeout);
static int oh323_hangup(struct ast_channel *c);
static int oh323_answer(struct ast_channel *c);
static struct ast_frame *oh323_read(struct ast_channel *c);
static int oh323_write(struct ast_channel *c, struct ast_frame *frame);
static int oh323_indicate(struct ast_channel *c, int condition, const void *data, size_t datalen);
static int oh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);

static const struct ast_channel_tech oh323_tech = {
   .type = "H323",
   .description = tdesc,
   .capabilities = AST_FORMAT_AUDIO_MASK,
   .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
   .requester = oh323_request,
   .send_digit_begin = oh323_digit_begin,
   .send_digit_end = oh323_digit_end,
   .call = oh323_call,
   .hangup = oh323_hangup,
   .answer = oh323_answer,
   .read = oh323_read,
   .write = oh323_write,
   .indicate = oh323_indicate,
   .fixup = oh323_fixup,
   .bridge = ast_rtp_bridge,
};

static const char* redirectingreason2str(int redirectingreason)
{
   switch (redirectingreason) {
   case 0:
      return "UNKNOWN";
   case 1:
      return "BUSY";
   case 2:
      return "NO_REPLY";
   case 0xF:
      return "UNCONDITIONAL";
   default:
      return "NOREDIRECT";
   }
}

static void oh323_destroy_alias(struct oh323_alias *alias)
{
   if (h323debug)
      ast_debug(1, "Destroying alias '%s'\n", alias->name);
   ast_free(alias);
}

static void oh323_destroy_user(struct oh323_user *user)
{
   if (h323debug)
      ast_debug(1, "Destroying user '%s'\n", user->name);
   ast_free_ha(user->ha);
   ast_free(user);
}

static void oh323_destroy_peer(struct oh323_peer *peer)
{
   if (h323debug)
      ast_debug(1, "Destroying peer '%s'\n", peer->name);
   ast_free_ha(peer->ha);
   ast_free(peer);
}

static int oh323_simulate_dtmf_end(const void *data)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *)data;

   if (pvt) {
      ast_mutex_lock(&pvt->lock);
      /* Don't hold pvt lock while trying to lock the channel */
      while(pvt->owner && ast_channel_trylock(pvt->owner)) {
         DEADLOCK_AVOIDANCE(&pvt->lock);
      }

      if (pvt->owner) {
         struct ast_frame f = {
            .frametype = AST_FRAME_DTMF_END,
            .subclass = pvt->curDTMF,
            .samples = 0,
            .src = "SIMULATE_DTMF_END",
         };
         ast_queue_frame(pvt->owner, &f);
         ast_channel_unlock(pvt->owner);
      }

      pvt->DTMFsched = -1;
      ast_mutex_unlock(&pvt->lock);
   }

   return 0;
}

/*! \brief Channel and private structures should be already locked */
static void __oh323_update_info(struct ast_channel *c, struct oh323_pvt *pvt)
{
   if (c->nativeformats != pvt->nativeformats) {
      if (h323debug)
         ast_debug(1, "Preparing %s for new native format\n", c->name);
      c->nativeformats = pvt->nativeformats;
      ast_set_read_format(c, c->readformat);
      ast_set_write_format(c, c->writeformat);
   }
   if (pvt->needhangup) {
      if (h323debug)
         ast_debug(1, "Process pending hangup for %s\n", c->name);
      c->_softhangup |= AST_SOFTHANGUP_DEV;
      c->hangupcause = pvt->hangupcause;
      ast_queue_hangup_with_cause(c, pvt->hangupcause);
      pvt->needhangup = 0;
      pvt->newstate = pvt->newcontrol = pvt->newdigit = pvt->DTMFsched = -1;
   }
   if (pvt->newstate >= 0) {
      ast_setstate(c, pvt->newstate);
      pvt->newstate = -1;
   }
   if (pvt->newcontrol >= 0) {
      ast_queue_control(c, pvt->newcontrol);
      pvt->newcontrol = -1;
   }
   if (pvt->newdigit >= 0) {
      struct ast_frame f = {
         .frametype = AST_FRAME_DTMF_END,
         .subclass = pvt->newdigit,
         .samples = pvt->newduration * 8,
         .len = pvt->newduration,
         .src = "UPDATE_INFO",
      };
      if (pvt->newdigit == ' ') {      /* signalUpdate message */
         f.subclass = pvt->curDTMF;
         if (pvt->DTMFsched >= 0) {
            AST_SCHED_DEL(sched, pvt->DTMFsched);
         }
      } else {                /* Regular input or signal message */
         if (pvt->newduration) {    /* This is a signal, signalUpdate follows */
            f.frametype = AST_FRAME_DTMF_BEGIN;
            AST_SCHED_DEL(sched, pvt->DTMFsched);
            pvt->DTMFsched = ast_sched_add(sched, pvt->newduration, oh323_simulate_dtmf_end, pvt);
            if (h323debug)
               ast_log(LOG_DTMF, "Scheduled DTMF END simulation for %d ms, id=%d\n", pvt->newduration, pvt->DTMFsched);
         }
         pvt->curDTMF = pvt->newdigit;
      }
      ast_queue_frame(c, &f);
      pvt->newdigit = -1;
   }
   if (pvt->update_rtp_info > 0) {
      if (pvt->rtp) {
         ast_jb_configure(c, &global_jbconf);
         ast_channel_set_fd(c, 0, ast_rtp_fd(pvt->rtp));
         ast_channel_set_fd(c, 1, ast_rtcp_fd(pvt->rtp));
         ast_queue_frame(pvt->owner, &ast_null_frame);   /* Tell Asterisk to apply changes */
      }
      pvt->update_rtp_info = -1;
   }
}

/*! \brief Only channel structure should be locked */
static void oh323_update_info(struct ast_channel *c)
{
   struct oh323_pvt *pvt = c->tech_pvt;

   if (pvt) {
      ast_mutex_lock(&pvt->lock);
      __oh323_update_info(c, pvt);
      ast_mutex_unlock(&pvt->lock);
   }
}

static void cleanup_call_details(call_details_t *cd)
{
   if (cd->call_token) {
      ast_free(cd->call_token);
      cd->call_token = NULL;
   }
   if (cd->call_source_aliases) {
      ast_free(cd->call_source_aliases);
      cd->call_source_aliases = NULL;
   }
   if (cd->call_dest_alias) {
      ast_free(cd->call_dest_alias);
      cd->call_dest_alias = NULL;
   }
   if (cd->call_source_name) {
      ast_free(cd->call_source_name);
      cd->call_source_name = NULL;
   }
   if (cd->call_source_e164) {
      ast_free(cd->call_source_e164);
      cd->call_source_e164 = NULL;
   }
   if (cd->call_dest_e164) {
      ast_free(cd->call_dest_e164);
      cd->call_dest_e164 = NULL;
   }
   if (cd->sourceIp) {
      ast_free(cd->sourceIp);
      cd->sourceIp = NULL;
   }
   if (cd->redirect_number) {
      ast_free(cd->redirect_number);
      cd->redirect_number = NULL;
   }
}

static void __oh323_destroy(struct oh323_pvt *pvt)
{
   struct oh323_pvt *cur, *prev = NULL;

   AST_SCHED_DEL(sched, pvt->DTMFsched);

   if (pvt->rtp) {
      ast_rtp_destroy(pvt->rtp);
   }

   /* Free dsp used for in-band DTMF detection */
   if (pvt->vad) {
      ast_dsp_free(pvt->vad);
   }
   cleanup_call_details(&pvt->cd);

   /* Unlink us from the owner if we have one */
   if (pvt->owner) {
      ast_channel_lock(pvt->owner);
      if (h323debug)
         ast_debug(1, "Detaching from %s\n", pvt->owner->name);
      pvt->owner->tech_pvt = NULL;
      ast_channel_unlock(pvt->owner);
   }
   cur = iflist;
   while(cur) {
      if (cur == pvt) {
         if (prev)
            prev->next = cur->next;
         else
            iflist = cur->next;
         break;
      }
      prev = cur;
      cur = cur->next;
   }
   if (!cur) {
      ast_log(LOG_WARNING, "%p is not in list?!?! \n", cur);
   } else {
      ast_mutex_unlock(&pvt->lock);
      ast_mutex_destroy(&pvt->lock);
      ast_free(pvt);
   }
}

static void oh323_destroy(struct oh323_pvt *pvt)
{
   if (h323debug) {
      ast_debug(1, "Destroying channel %s\n", (pvt->owner ? pvt->owner->name : "<unknown>"));
   }
   ast_mutex_lock(&iflock);
   ast_mutex_lock(&pvt->lock);
   __oh323_destroy(pvt);
   ast_mutex_unlock(&iflock);
}

static int oh323_digit_begin(struct ast_channel *c, char digit)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token;

   if (!pvt) {
      ast_log(LOG_ERROR, "No private structure?! This is bad\n");
      return -1;
   }
   ast_mutex_lock(&pvt->lock);
   if (pvt->rtp &&
      (((pvt->options.dtmfmode & H323_DTMF_RFC2833) && pvt->dtmf_pt[0])
       /*|| ((pvt->options.dtmfmode & H323_DTMF_CISCO) && pvt->dtmf_pt[1]))*/)) {
      /* out-of-band DTMF */
      if (h323debug) {
         ast_log(LOG_DTMF, "Begin sending out-of-band digit %c on %s\n", digit, c->name);
      }
      ast_rtp_senddigit_begin(pvt->rtp, digit);
      ast_mutex_unlock(&pvt->lock);
   } else if (pvt->txDtmfDigit != digit) {
      /* in-band DTMF */
      if (h323debug) {
         ast_log(LOG_DTMF, "Begin sending inband digit %c on %s\n", digit, c->name);
      }
      pvt->txDtmfDigit = digit;
      token = pvt->cd.call_token ? ast_strdup(pvt->cd.call_token) : NULL;
      ast_mutex_unlock(&pvt->lock);
      h323_send_tone(token, digit);
      if (token) {
         ast_free(token);
      }
   } else
      ast_mutex_unlock(&pvt->lock);
   oh323_update_info(c);
   return 0;
}

/*! \brief
 * Send (play) the specified digit to the channel.
 *
 */
static int oh323_digit_end(struct ast_channel *c, char digit, unsigned int duration)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token;

   if (!pvt) {
      ast_log(LOG_ERROR, "No private structure?! This is bad\n");
      return -1;
   }
   ast_mutex_lock(&pvt->lock);
   if (pvt->rtp && (pvt->options.dtmfmode & H323_DTMF_RFC2833) && ((pvt->dtmf_pt[0] > 0) || (pvt->dtmf_pt[0] > 0))) {
      /* out-of-band DTMF */
      if (h323debug) {
         ast_log(LOG_DTMF, "End sending out-of-band digit %c on %s, duration %d\n", digit, c->name, duration);
      }
      ast_rtp_senddigit_end(pvt->rtp, digit);
      ast_mutex_unlock(&pvt->lock);
   } else {
      /* in-band DTMF */
      if (h323debug) {
         ast_log(LOG_DTMF, "End sending inband digit %c on %s, duration %d\n", digit, c->name, duration);
      }
      pvt->txDtmfDigit = ' ';
      token = pvt->cd.call_token ? ast_strdup(pvt->cd.call_token) : NULL;
      ast_mutex_unlock(&pvt->lock);
      h323_send_tone(token, ' ');
      if (token) {
         ast_free(token);
      }
   }
   oh323_update_info(c);
   return 0;
}

/*! \brief
 * Make a call over the specified channel to the specified
 * destination.
 * Returns -1 on error, 0 on success.
 */
static int oh323_call(struct ast_channel *c, char *dest, int timeout)
{
   int res = 0;
   struct oh323_pvt *pvt = (struct oh323_pvt *)c->tech_pvt;
   const char *addr;
   char called_addr[1024];

   if (h323debug) {
      ast_debug(1, "Calling to %s on %s\n", dest, c->name);
   }
   if ((c->_state != AST_STATE_DOWN) && (c->_state != AST_STATE_RESERVED)) {
      ast_log(LOG_WARNING, "Line is already in use (%s)\n", c->name);
      return -1;
   }
   ast_mutex_lock(&pvt->lock);
   if (!gatekeeper_disable) {
      if (ast_strlen_zero(pvt->exten)) {
         ast_copy_string(called_addr, dest, sizeof(called_addr));
      } else {
         snprintf(called_addr, sizeof(called_addr), "%s@%s", pvt->exten, dest);
      }
   } else {
      res = htons(pvt->sa.sin_port);
      addr = ast_inet_ntoa(pvt->sa.sin_addr);
      if (ast_strlen_zero(pvt->exten)) {
         snprintf(called_addr, sizeof(called_addr), "%s:%d", addr, res);
      } else {
         snprintf(called_addr, sizeof(called_addr), "%s@%s:%d", pvt->exten, addr, res);
      }
   }
   /* make sure null terminated */
   called_addr[sizeof(called_addr) - 1] = '\0';

   if (c->cid.cid_num)
      ast_copy_string(pvt->options.cid_num, c->cid.cid_num, sizeof(pvt->options.cid_num));

   if (c->cid.cid_name)
      ast_copy_string(pvt->options.cid_name, c->cid.cid_name, sizeof(pvt->options.cid_name));

   if (c->cid.cid_rdnis) {
      ast_copy_string(pvt->options.cid_rdnis, c->cid.cid_rdnis, sizeof(pvt->options.cid_rdnis));
   }

   pvt->options.presentation = c->cid.cid_pres;
   pvt->options.type_of_number = c->cid.cid_ton;

   if ((addr = pbx_builtin_getvar_helper(c, "PRIREDIRECTREASON"))) {
      if (!strcasecmp(addr, "UNKNOWN"))
         pvt->options.redirect_reason = 0;
      else if (!strcasecmp(addr, "BUSY"))
         pvt->options.redirect_reason = 1;
      else if (!strcasecmp(addr, "NO_REPLY"))
         pvt->options.redirect_reason = 2;
      else if (!strcasecmp(addr, "UNCONDITIONAL"))
         pvt->options.redirect_reason = 15;
      else
         pvt->options.redirect_reason = -1;
   } else
      pvt->options.redirect_reason = -1;

   pvt->options.transfer_capability = c->transfercapability;

   /* indicate that this is an outgoing call */
   pvt->outgoing = 1;

   ast_verb(3, "Requested transfer capability: 0x%.2x - %s\n", c->transfercapability, ast_transfercapability2str(c->transfercapability));
   if (h323debug)
      ast_debug(1, "Placing outgoing call to %s, %d/%d\n", called_addr, pvt->options.dtmfcodec[0], pvt->options.dtmfcodec[1]);
   ast_mutex_unlock(&pvt->lock);
   res = h323_make_call(called_addr, &(pvt->cd), &pvt->options);
   if (res) {
      ast_log(LOG_NOTICE, "h323_make_call failed(%s)\n", c->name);
      return -1;
   }
   oh323_update_info(c);
   return 0;
}

static int oh323_answer(struct ast_channel *c)
{
   int res;
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token;

   if (h323debug)
      ast_debug(1, "Answering on %s\n", c->name);

   ast_mutex_lock(&pvt->lock);
   token = pvt->cd.call_token ? ast_strdup(pvt->cd.call_token) : NULL;
   ast_mutex_unlock(&pvt->lock);
   res = h323_answering_call(token, 0);
   if (token)
      ast_free(token);

   oh323_update_info(c);
   if (c->_state != AST_STATE_UP) {
      ast_setstate(c, AST_STATE_UP);
   }
   return res;
}

static int oh323_hangup(struct ast_channel *c)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   int q931cause = AST_CAUSE_NORMAL_CLEARING;
   char *call_token;


   if (h323debug)
      ast_debug(1, "Hanging up and scheduling destroy of call %s\n", c->name);

   if (!c->tech_pvt) {
      ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
      return 0;
   }
   ast_mutex_lock(&pvt->lock);
   /* Determine how to disconnect */
   if (pvt->owner != c) {
      ast_log(LOG_WARNING, "Huh?  We aren't the owner?\n");
      ast_mutex_unlock(&pvt->lock);
      return 0;
   }

   pvt->owner = NULL;
   c->tech_pvt = NULL;

   if (c->hangupcause) {
      q931cause = c->hangupcause;
   } else {
      const char *cause = pbx_builtin_getvar_helper(c, "DIALSTATUS");
      if (cause) {
         if (!strcmp(cause, "CONGESTION")) {
            q931cause = AST_CAUSE_NORMAL_CIRCUIT_CONGESTION;
         } else if (!strcmp(cause, "BUSY")) {
            q931cause = AST_CAUSE_USER_BUSY;
         } else if (!strcmp(cause, "CHANISUNVAIL")) {
            q931cause = AST_CAUSE_REQUESTED_CHAN_UNAVAIL;
         } else if (!strcmp(cause, "NOANSWER")) {
            q931cause = AST_CAUSE_NO_ANSWER;
         } else if (!strcmp(cause, "CANCEL")) {
            q931cause = AST_CAUSE_CALL_REJECTED;
         }
      }
   }

   /* Start the process if it's not already started */
   if (!pvt->alreadygone && !pvt->hangupcause) {
      call_token = pvt->cd.call_token ? ast_strdup(pvt->cd.call_token) : NULL;
      if (call_token) {
         /* Release lock to eliminate deadlock */
         ast_mutex_unlock(&pvt->lock);
         if (h323_clear_call(call_token, q931cause)) {
            ast_log(LOG_WARNING, "ClearCall failed.\n");
         }
         ast_free(call_token);
         ast_mutex_lock(&pvt->lock);
      }
   }
   pvt->needdestroy = 1;
   ast_mutex_unlock(&pvt->lock);

   /* Update usage counter */
   ast_module_unref(ast_module_info->self);

   return 0;
}

/*! \brief Retrieve audio/etc from channel. Assumes pvt->lock is already held. */
static struct ast_frame *oh323_rtp_read(struct oh323_pvt *pvt)
{
   struct ast_frame *f;

   /* Only apply it for the first packet, we just need the correct ip/port */
   if (pvt->options.nat) {
      ast_rtp_setnat(pvt->rtp, pvt->options.nat);
      pvt->options.nat = 0;
   }

   f = ast_rtp_read(pvt->rtp);
   /* Don't send RFC2833 if we're not supposed to */
   if (f && (f->frametype == AST_FRAME_DTMF) && !(pvt->options.dtmfmode & (H323_DTMF_RFC2833 | H323_DTMF_CISCO))) {
      return &ast_null_frame;
   }
   if (pvt->owner) {
      /* We already hold the channel lock */
      if (f->frametype == AST_FRAME_VOICE) {
         if (f->subclass != pvt->owner->nativeformats) {
            /* Try to avoid deadlock */
            if (ast_channel_trylock(pvt->owner)) {
               ast_log(LOG_NOTICE, "Format changed but channel is locked. Ignoring frame...\n");
               return &ast_null_frame;
            }
            if (h323debug)
               ast_debug(1, "Oooh, format changed to %d\n", f->subclass);
            pvt->owner->nativeformats = f->subclass;
            pvt->nativeformats = f->subclass;
            ast_set_read_format(pvt->owner, pvt->owner->readformat);
            ast_set_write_format(pvt->owner, pvt->owner->writeformat);
            ast_channel_unlock(pvt->owner);
         }
         /* Do in-band DTMF detection */
         if ((pvt->options.dtmfmode & H323_DTMF_INBAND) && pvt->vad) {
            if ((pvt->nativeformats & (AST_FORMAT_SLINEAR | AST_FORMAT_ALAW | AST_FORMAT_ULAW))) {
               if (!ast_channel_trylock(pvt->owner)) {
                  f = ast_dsp_process(pvt->owner, pvt->vad, f);
                  ast_channel_unlock(pvt->owner);
               }
               else
                  ast_log(LOG_NOTICE, "Unable to process inband DTMF while channel is locked\n");
            } else if (pvt->nativeformats && !pvt->noInbandDtmf) {
               ast_log(LOG_NOTICE, "Inband DTMF is not supported on codec %s. Use RFC2833\n", ast_getformatname(f->subclass));
               pvt->noInbandDtmf = 1;
            }
            if (f &&(f->frametype == AST_FRAME_DTMF)) {
               if (h323debug)
                  ast_log(LOG_DTMF, "Received in-band digit %c.\n", f->subclass);
            }
         }
      }
   }
   return f;
}

static struct ast_frame *oh323_read(struct ast_channel *c)
{
   struct ast_frame *fr;
   struct oh323_pvt *pvt = (struct oh323_pvt *)c->tech_pvt;
   ast_mutex_lock(&pvt->lock);
   __oh323_update_info(c, pvt);
   switch(c->fdno) {
   case 0:
      fr = oh323_rtp_read(pvt);
      break;
   case 1:
      if (pvt->rtp)
         fr = ast_rtcp_read(pvt->rtp);
      else
         fr = &ast_null_frame;
      break;
   default:
      ast_log(LOG_ERROR, "Unable to handle fd %d on channel %s\n", c->fdno, c->name);
      fr = &ast_null_frame;
      break;
   }
   ast_mutex_unlock(&pvt->lock);
   return fr;
}

static int oh323_write(struct ast_channel *c, struct ast_frame *frame)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   int res = 0;
   if (frame->frametype != AST_FRAME_VOICE) {
      if (frame->frametype == AST_FRAME_IMAGE) {
         return 0;
      } else {
         ast_log(LOG_WARNING, "Can't send %d type frames with H323 write\n", frame->frametype);
         return 0;
      }
   } else {
      if (!(frame->subclass & c->nativeformats)) {
         ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
            frame->subclass, c->nativeformats, c->readformat, c->writeformat);
         return 0;
      }
   }
   if (pvt) {
      ast_mutex_lock(&pvt->lock);
      if (pvt->rtp && !pvt->recvonly)
         res = ast_rtp_write(pvt->rtp, frame);
      __oh323_update_info(c, pvt);
      ast_mutex_unlock(&pvt->lock);
   }
   return res;
}

static int oh323_indicate(struct ast_channel *c, int condition, const void *data, size_t datalen)
{

   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token = (char *)NULL;
   int res = -1;
   int got_progress;

   ast_mutex_lock(&pvt->lock);
   token = (pvt->cd.call_token ? ast_strdup(pvt->cd.call_token) : NULL);
   got_progress = pvt->got_progress;
   if (condition == AST_CONTROL_PROGRESS)
      pvt->got_progress = 1;
   else if ((condition == AST_CONTROL_BUSY) || (condition == AST_CONTROL_CONGESTION))
      pvt->alreadygone = 1;
   ast_mutex_unlock(&pvt->lock);

   if (h323debug)
      ast_debug(1, "OH323: Indicating %d on %s (%s)\n", condition, token, c->name);

   switch(condition) {
   case AST_CONTROL_RINGING:
      if (c->_state == AST_STATE_RING || c->_state == AST_STATE_RINGING) {
         h323_send_alerting(token);
         res = (got_progress ? 0 : -1);   /* Do not simulate any audio tones if we got PROGRESS message */
      }
      break;
   case AST_CONTROL_PROGRESS:
      if (c->_state != AST_STATE_UP) {
         /* Do not send PROGRESS message more than once */
         if (!got_progress)
            h323_send_progress(token);
         res = 0;
      }
      break;
   case AST_CONTROL_BUSY:
      if (c->_state != AST_STATE_UP) {
         h323_answering_call(token, 1);
         ast_softhangup_nolock(c, AST_SOFTHANGUP_DEV);
         res = 0;
      }
      break;
   case AST_CONTROL_CONGESTION:
      if (c->_state != AST_STATE_UP) {
         h323_answering_call(token, 1);
         ast_softhangup_nolock(c, AST_SOFTHANGUP_DEV);
         res = 0;
      }
      break;
   case AST_CONTROL_HOLD:
      h323_hold_call(token, 1);
      /* We should start MOH only if remote party isn't provide audio for us */
      ast_moh_start(c, data, NULL);
      res = 0;
      break;
   case AST_CONTROL_UNHOLD:
      h323_hold_call(token, 0);
      ast_moh_stop(c);
      res = 0;
      break;
   case AST_CONTROL_SRCUPDATE:
      ast_rtp_new_source(pvt->rtp);
      res = 0;
      break;
   case AST_CONTROL_PROCEEDING:
   case -1:
      break;
   default:
      ast_log(LOG_WARNING, "OH323: Don't know how to indicate condition %d on %s\n", condition, token);
      break;
   }

   if (h323debug)
      ast_debug(1, "OH323: Indicated %d on %s, res=%d\n", condition, token, res);
   if (token)
      ast_free(token);
   oh323_update_info(c);

   return res;
}

static int oh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) newchan->tech_pvt;

   ast_mutex_lock(&pvt->lock);
   if (pvt->owner != oldchan) {
      ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, pvt->owner);
      return -1;
   }
   pvt->owner = newchan;
   ast_mutex_unlock(&pvt->lock);
   return 0;
}

static int __oh323_rtp_create(struct oh323_pvt *pvt)
{
   struct in_addr our_addr;

   if (pvt->rtp)
      return 0;

   if (ast_find_ourip(&our_addr, bindaddr)) {
      ast_mutex_unlock(&pvt->lock);
      ast_log(LOG_ERROR, "Unable to locate local IP address for RTP stream\n");
      return -1;
   }
   pvt->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0, our_addr);
   if (!pvt->rtp) {
      ast_mutex_unlock(&pvt->lock);
      ast_log(LOG_WARNING, "Unable to create RTP session: %s\n", strerror(errno));
      return -1;
   }
   if (h323debug)
      ast_debug(1, "Created RTP channel\n");

   ast_rtp_setqos(pvt->rtp, tos, cos, "H323 RTP");

   if (h323debug)
      ast_debug(1, "Setting NAT on RTP to %d\n", pvt->options.nat);
   ast_rtp_setnat(pvt->rtp, pvt->options.nat);

   if (pvt->dtmf_pt[0] > 0)
      ast_rtp_set_rtpmap_type(pvt->rtp, pvt->dtmf_pt[0], "audio", "telephone-event", 0);
   if (pvt->dtmf_pt[1] > 0)
      ast_rtp_set_rtpmap_type(pvt->rtp, pvt->dtmf_pt[1], "audio", "cisco-telephone-event", 0);

   if (pvt->peercapability)
      ast_rtp_codec_setpref(pvt->rtp, &pvt->peer_prefs);

   if (pvt->owner && !ast_channel_trylock(pvt->owner)) {
      ast_jb_configure(pvt->owner, &global_jbconf);
      ast_channel_set_fd(pvt->owner, 0, ast_rtp_fd(pvt->rtp));
      ast_channel_set_fd(pvt->owner, 1, ast_rtcp_fd(pvt->rtp));
      ast_queue_frame(pvt->owner, &ast_null_frame);   /* Tell Asterisk to apply changes */
      ast_channel_unlock(pvt->owner);
   } else
      pvt->update_rtp_info = 1;

   return 0;
}

/*! \brief Private structure should be locked on a call */
static struct ast_channel *__oh323_new(struct oh323_pvt *pvt, int state, const char *host)
{
   struct ast_channel *ch;
   char *cid_num, *cid_name;
   int fmt;

   if (!ast_strlen_zero(pvt->options.cid_num))
      cid_num = pvt->options.cid_num;
   else
      cid_num = pvt->cd.call_source_e164;

   if (!ast_strlen_zero(pvt->options.cid_name))
      cid_name = pvt->options.cid_name;
   else
      cid_name = pvt->cd.call_source_name;
   
   /* Don't hold a oh323_pvt lock while we allocate a chanel */
   ast_mutex_unlock(&pvt->lock);
   ch = ast_channel_alloc(1, state, cid_num, cid_name, pvt->accountcode, pvt->exten, pvt->context, pvt->amaflags, "H323/%s", host);
   /* Update usage counter */
   ast_module_ref(ast_module_info->self);
   ast_mutex_lock(&pvt->lock);
   if (ch) {
      ch->tech = &oh323_tech;
      if (!(fmt = pvt->jointcapability) && !(fmt = pvt->options.capability))
         fmt = global_options.capability;
      ch->nativeformats = ast_codec_choose(&pvt->options.prefs, fmt, 1)/* | (pvt->jointcapability & AST_FORMAT_VIDEO_MASK)*/;
      pvt->nativeformats = ch->nativeformats;
      fmt = ast_best_codec(ch->nativeformats);
      ch->writeformat = fmt;
      ch->rawwriteformat = fmt;
      ch->readformat = fmt;
      ch->rawreadformat = fmt;
      if (!pvt->rtp)
         __oh323_rtp_create(pvt);
#if 0
      ast_channel_set_fd(ch, 0, ast_rtp_fd(pvt->rtp));
      ast_channel_set_fd(ch, 1, ast_rtcp_fd(pvt->rtp));
#endif
#ifdef VIDEO_SUPPORT
      if (pvt->vrtp) {
         ast_channel_set_fd(ch, 2, ast_rtp_fd(pvt->vrtp));
         ast_channel_set_fd(ch, 3, ast_rtcp_fd(pvt->vrtp));
      }
#endif
#ifdef T38_SUPPORT
      if (pvt->udptl) {
         ast_channel_set_fd(ch, 4, ast_udptl_fd(pvt->udptl));
      }
#endif
      if (state == AST_STATE_RING) {
         ch->rings = 1;
      }
      /* Allocate dsp for in-band DTMF support */
      if (pvt->options.dtmfmode & H323_DTMF_INBAND) {
         pvt->vad = ast_dsp_new();
         ast_dsp_set_features(pvt->vad, DSP_FEATURE_DIGIT_DETECT);
      }
      /* Register channel functions. */
      ch->tech_pvt = pvt;
      /* Set the owner of this channel */
      pvt->owner = ch;

      ast_copy_string(ch->context, pvt->context, sizeof(ch->context));
      ast_copy_string(ch->exten, pvt->exten, sizeof(ch->exten));
      ch->priority = 1;
      if (!ast_strlen_zero(pvt->accountcode)) {
         ast_string_field_set(ch, accountcode, pvt->accountcode);
      }
      if (pvt->amaflags) {
         ch->amaflags = pvt->amaflags;
      }

      /* Don't use ast_set_callerid() here because it will
       * generate a needless NewCallerID event */
      ch->cid.cid_ani = ast_strdup(cid_num);

      if (pvt->cd.redirect_reason >= 0) {
         ch->cid.cid_rdnis = ast_strdup(pvt->cd.redirect_number);
         pbx_builtin_setvar_helper(ch, "PRIREDIRECTREASON", redirectingreason2str(pvt->cd.redirect_reason));
      }
      ch->cid.cid_pres = pvt->cd.presentation;
      ch->cid.cid_ton = pvt->cd.type_of_number;

      if (!ast_strlen_zero(pvt->exten) && strcmp(pvt->exten, "s")) {
         ch->cid.cid_dnid = ast_strdup(pvt->exten);
      }
      if (pvt->cd.transfer_capability >= 0)
         ch->transfercapability = pvt->cd.transfer_capability;
      if (state != AST_STATE_DOWN) {
         if (ast_pbx_start(ch)) {
            ast_log(LOG_WARNING, "Unable to start PBX on %s\n", ch->name);
            ast_hangup(ch);
            ch = NULL;
         }
      }
   } else {
      ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
   }
   return ch;
}

static struct oh323_pvt *oh323_alloc(int callid)
{
   struct oh323_pvt *pvt;

   pvt = ast_calloc(1, sizeof(*pvt));
   if (!pvt) {
      ast_log(LOG_ERROR, "Couldn't allocate private structure. This is bad\n");
      return NULL;
   }
   pvt->cd.redirect_reason = -1;
   pvt->cd.transfer_capability = -1;
   /* Ensure the call token is allocated for outgoing call */
   if (!callid) {
      if ((pvt->cd).call_token == NULL) {
         (pvt->cd).call_token = ast_calloc(1, 128);
      }
      if (!pvt->cd.call_token) {
         ast_log(LOG_ERROR, "Not enough memory to alocate call token\n");
         ast_rtp_destroy(pvt->rtp);
         ast_free(pvt);
         return NULL;
      }
      memset((char *)(pvt->cd).call_token, 0, 128);
      pvt->cd.call_reference = callid;
   }
   memcpy(&pvt->options, &global_options, sizeof(pvt->options));
   pvt->jointcapability = pvt->options.capability;
   if (pvt->options.dtmfmode & (H323_DTMF_RFC2833 | H323_DTMF_CISCO)) {
      pvt->nonCodecCapability |= AST_RTP_DTMF;
   } else {
      pvt->nonCodecCapability &= ~AST_RTP_DTMF;
   }
   ast_copy_string(pvt->context, default_context, sizeof(pvt->context));
   pvt->newstate = pvt->newcontrol = pvt->newdigit = pvt->update_rtp_info = pvt->DTMFsched = -1;
   ast_mutex_init(&pvt->lock);
   /* Add to interface list */
   ast_mutex_lock(&iflock);
   pvt->next = iflist;
   iflist = pvt;
   ast_mutex_unlock(&iflock);
   return pvt;
}

static struct oh323_pvt *find_call_locked(int call_reference, const char *token)
{
   struct oh323_pvt *pvt;

   ast_mutex_lock(&iflock);
   pvt = iflist;
   while(pvt) {
      if (!pvt->needdestroy && ((signed int)pvt->cd.call_reference == call_reference)) {
         /* Found the call */
         if ((token != NULL) && (pvt->cd.call_token != NULL) && (!strcmp(pvt->cd.call_token, token))) {
            ast_mutex_lock(&pvt->lock);
            ast_mutex_unlock(&iflock);
            return pvt;
         } else if (token == NULL) {
            ast_log(LOG_WARNING, "Call Token is NULL\n");
            ast_mutex_lock(&pvt->lock);
            ast_mutex_unlock(&iflock);
            return pvt;
         }
      }
      pvt = pvt->next;
   }
   ast_mutex_unlock(&iflock);
   return NULL;
}

static int update_state(struct oh323_pvt *pvt, int state, int signal)
{
   if (!pvt)
      return 0;
   if (pvt->owner && !ast_channel_trylock(pvt->owner)) {
      if (state >= 0)
         ast_setstate(pvt->owner, state);
      if (signal >= 0)
         ast_queue_control(pvt->owner, signal);
      ast_channel_unlock(pvt->owner);
      return 1;
   }
   else {
      if (state >= 0)
         pvt->newstate = state;
      if (signal >= 0)
         pvt->newcontrol = signal;
      return 0;
   }
}

static struct oh323_alias *build_alias(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime)
{
   struct oh323_alias *alias;
   int found = 0;

   alias = ASTOBJ_CONTAINER_FIND_UNLINK_FULL(&aliasl, name, name, 0, 0, strcasecmp);

   if (alias)
      found++;
   else {
      if (!(alias = ast_calloc(1, sizeof(*alias))))
         return NULL;
      ASTOBJ_INIT(alias);
   }
   if (!found && name)
      ast_copy_string(alias->name, name, sizeof(alias->name));
   for (; v || ((v = alt) && !(alt = NULL)); v = v->next) {
      if (!strcasecmp(v->name, "e164")) {
         ast_copy_string(alias->e164, v->value, sizeof(alias->e164));
      } else if (!strcasecmp(v->name, "prefix")) {
         ast_copy_string(alias->prefix, v->value, sizeof(alias->prefix));
      } else if (!strcasecmp(v->name, "context")) {
         ast_copy_string(alias->context, v->value, sizeof(alias->context));
      } else if (!strcasecmp(v->name, "secret")) {
         ast_copy_string(alias->secret, v->value, sizeof(alias->secret));
      } else {
         if (strcasecmp(v->value, "h323")) {
            ast_log(LOG_WARNING, "Keyword %s does not make sense in type=h323\n", v->name);
         }
      }
   }
   ASTOBJ_UNMARK(alias);
   return alias;
}

static struct oh323_alias *realtime_alias(const char *alias)
{
   struct ast_variable *var, *tmp;
   struct oh323_alias *a;

   var = ast_load_realtime("h323", "name", alias, SENTINEL);

   if (!var)
      return NULL;

   for (tmp = var; tmp; tmp = tmp->next) {
      if (!strcasecmp(tmp->name, "type") &&
      !(!strcasecmp(tmp->value, "alias") || !strcasecmp(tmp->value, "h323"))) {
         ast_variables_destroy(var);
         return NULL;
      }
   }

   a = build_alias(alias, var, NULL, 1);

   ast_variables_destroy(var);

   return a;
}

static int update_common_options(struct ast_variable *v, struct call_options *options)
{
   int tmp = 0;
   char *val, *opt;

   if (!strcasecmp(v->name, "allow")) {
      ast_parse_allow_disallow(&options->prefs, &options->capability, v->value, 1);
   } else if (!strcasecmp(v->name, "autoframing")) {
      options->autoframing = ast_true(v->value);
   } else if (!strcasecmp(v->name, "disallow")) {
      ast_parse_allow_disallow(&options->prefs, &options->capability, v->value, 0);
   } else if (!strcasecmp(v->name, "dtmfmode")) {
      val = ast_strdupa(v->value);
      if ((opt = strchr(val, ':')) != (char *)NULL) {
         *opt++ = '\0';
         tmp = atoi(opt);
      }
      if (!strcasecmp(v->value, "inband")) {
         options->dtmfmode |= H323_DTMF_INBAND;
      } else if (!strcasecmp(val, "rfc2833")) {
         options->dtmfmode |= H323_DTMF_RFC2833;
         if (!opt) {
            options->dtmfcodec[0] = H323_DTMF_RFC2833_PT;
         } else if ((tmp >= 96) && (tmp < 128)) {
            options->dtmfcodec[0] = tmp;
         } else {
            options->dtmfcodec[0] = H323_DTMF_RFC2833_PT;
            ast_log(LOG_WARNING, "Unknown rfc2833 payload %s specified at line %d, using default %d\n", opt, v->lineno, options->dtmfcodec[0]);
         }
      } else if (!strcasecmp(val, "cisco")) {
         options->dtmfmode |= H323_DTMF_CISCO;
         if (!opt) {
            options->dtmfcodec[1] = H323_DTMF_CISCO_PT;
         } else if ((tmp >= 96) && (tmp < 128)) {
            options->dtmfcodec[1] = tmp;
         } else {
            options->dtmfcodec[1] = H323_DTMF_CISCO_PT;
            ast_log(LOG_WARNING, "Unknown Cisco DTMF payload %s specified at line %d, using default %d\n", opt, v->lineno, options->dtmfcodec[1]);
         }
      } else if (!strcasecmp(v->value, "h245-signal")) {
         options->dtmfmode |= H323_DTMF_SIGNAL;
      } else {
         ast_log(LOG_WARNING, "Unknown dtmf mode '%s' at line %d\n", v->value, v->lineno);
      }
   } else if (!strcasecmp(v->name, "dtmfcodec")) {
      ast_log(LOG_NOTICE, "Option %s at line %d is deprecated. Use dtmfmode=rfc2833[:<payload>] instead.\n", v->name, v->lineno);
      tmp = atoi(v->value);
      if (tmp < 96)
         ast_log(LOG_WARNING, "Invalid %s value %s at line %d\n", v->name, v->value, v->lineno);
      else
         options->dtmfcodec[0] = tmp;
   } else if (!strcasecmp(v->name, "bridge")) {
      options->bridge = ast_true(v->value);
   } else if (!strcasecmp(v->name, "nat")) {
      options->nat = ast_true(v->value);
   } else if (!strcasecmp(v->name, "fastStart")) {
      options->fastStart = ast_true(v->value);
   } else if (!strcasecmp(v->name, "h245Tunneling")) {
      options->h245Tunneling = ast_true(v->value);
   } else if (!strcasecmp(v->name, "silenceSuppression")) {
      options->silenceSuppression = ast_true(v->value);
   } else if (!strcasecmp(v->name, "progress_setup")) {
      tmp = atoi(v->value);
      if ((tmp != 0) && (tmp != 1) && (tmp != 3) && (tmp != 8)) {
         ast_log(LOG_WARNING, "Invalid value %s for %s at line %d, assuming 0\n", v->value, v->name, v->lineno);
         tmp = 0;
      }
      options->progress_setup = tmp;
   } else if (!strcasecmp(v->name, "progress_alert")) {
      tmp = atoi(v->value);
      if ((tmp != 0) && (tmp != 1) && (tmp != 8)) {
         ast_log(LOG_WARNING, "Invalid value %s for %s at line %d, assuming 0\n", v->value, v->name, v->lineno);
         tmp = 0;
      }
      options->progress_alert = tmp;
   } else if (!strcasecmp(v->name, "progress_audio")) {
      options->progress_audio = ast_true(v->value);
   } else if (!strcasecmp(v->name, "callerid")) {
      ast_callerid_split(v->value, options->cid_name, sizeof(options->cid_name), options->cid_num, sizeof(options->cid_num));
   } else if (!strcasecmp(v->name, "fullname")) {
      ast_copy_string(options->cid_name, v->value, sizeof(options->cid_name));
   } else if (!strcasecmp(v->name, "cid_number")) {
      ast_copy_string(options->cid_num, v->value, sizeof(options->cid_num));
   } else if (!strcasecmp(v->name, "tunneling")) {
      if (!strcasecmp(v->value, "none"))
         options->tunnelOptions = 0;
      else if (!strcasecmp(v->value, "cisco"))
         options->tunnelOptions |= H323_TUNNEL_CISCO;
      else if (!strcasecmp(v->value, "qsig"))
         options->tunnelOptions |= H323_TUNNEL_QSIG;
      else
         ast_log(LOG_WARNING, "Invalid value %s for %s at line %d\n", v->value, v->name, v->lineno);
   } else if (!strcasecmp(v->name, "hold")) {
      if (!strcasecmp(v->value, "none"))
         options->holdHandling = ~0;
      else if (!strcasecmp(v->value, "notify"))
         options->holdHandling |= H323_HOLD_NOTIFY;
      else if (!strcasecmp(v->value, "q931only"))
         options->holdHandling |= H323_HOLD_NOTIFY | H323_HOLD_Q931ONLY;
      else if (!strcasecmp(v->value, "h450"))
         options->holdHandling |= H323_HOLD_H450;
      else
         ast_log(LOG_WARNING, "Invalid value %s for %s at line %d\n", v->value, v->name, v->lineno);
   } else
      return 1;

   return 0;
}

static struct oh323_user *build_user(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime)
{
   struct oh323_user *user;
   struct ast_ha *oldha;
   int found = 0;
   int format;

   user = ASTOBJ_CONTAINER_FIND_UNLINK_FULL(&userl, name, name, 0, 0, strcmp);

   if (user)
      found++;
   else {
      if (!(user = ast_calloc(1, sizeof(*user))))
         return NULL;
      ASTOBJ_INIT(user);
   }
   oldha = user->ha;
   user->ha = (struct ast_ha *)NULL;
   memcpy(&user->options, &global_options, sizeof(user->options));
   user->options.dtmfmode = 0;
   user->options.holdHandling = 0;
   /* Set default context */
   ast_copy_string(user->context, default_context, sizeof(user->context));
   if (user && !found)
      ast_copy_string(user->name, name, sizeof(user->name));

#if 0 /* XXX Port channel variables functionality from chan_sip XXX */
   if (user->chanvars) {
      ast_variables_destroy(user->chanvars);
      user->chanvars = NULL;
   }
#endif

   for (; v || ((v = alt) && !(alt = NULL)); v = v->next) {
      if (!update_common_options(v, &user->options))
         continue;
      if (!strcasecmp(v->name, "context")) {
         ast_copy_string(user->context, v->value, sizeof(user->context));
      } else if (!strcasecmp(v->name, "secret")) {
         ast_copy_string(user->secret, v->value, sizeof(user->secret));
      } else if (!strcasecmp(v->name, "accountcode")) {
         ast_copy_string(user->accountcode, v->value, sizeof(user->accountcode));
      } else if (!strcasecmp(v->name, "host")) {
         if (!strcasecmp(v->value, "dynamic")) {
            ast_log(LOG_ERROR, "A dynamic host on a type=user does not make any sense\n");
            ASTOBJ_UNREF(user, oh323_destroy_user);
            return NULL;
         } else if (ast_get_ip(&user->addr, v->value)) {
            ASTOBJ_UNREF(user, oh323_destroy_user);
            return NULL;
         }
         /* Let us know we need to use ip authentication */
         user->host = 1;
      } 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, "permit") ||
               !strcasecmp(v->name, "deny")) {
         int ha_error = 0;

         user->ha = ast_append_ha(v->name, v->value, user->ha, &ha_error);
         if (ha_error)
            ast_log(LOG_ERROR, "Bad ACL entry in configuration line %d : %s\n", v->lineno, v->value);
      }
   }
   if (!user->options.dtmfmode)
      user->options.dtmfmode = global_options.dtmfmode;
   if (user->options.holdHandling == ~0)
      user->options.holdHandling = 0;
   else if (!user->options.holdHandling)
      user->options.holdHandling = global_options.holdHandling;
   ASTOBJ_UNMARK(user);
   ast_free_ha(oldha);
   return user;
}

static struct oh323_user *realtime_user(const call_details_t *cd)
{
   struct ast_variable *var, *tmp;
   struct oh323_user *user;
   const char *username;

   if (userbyalias)
      var = ast_load_realtime("h323", "name", username = cd->call_source_aliases, SENTINEL);
   else {
      username = (char *)NULL;
      var = ast_load_realtime("h323", "host", cd->sourceIp, SENTINEL);
   }

   if (!var)
      return NULL;

   for (tmp = var; tmp; tmp = tmp->next) {
      if (!strcasecmp(tmp->name, "type") &&
      !(!strcasecmp(tmp->value, "user") || !strcasecmp(tmp->value, "friend"))) {
         ast_variables_destroy(var);
         return NULL;
      } else if (!username && !strcasecmp(tmp->name, "name"))
         username = tmp->value;
   }

   if (!username) {
      ast_log(LOG_WARNING, "Cannot determine user name for IP address %s\n", cd->sourceIp);
      ast_variables_destroy(var);
      return NULL;
   }

   user = build_user(username, var, NULL, 1);

   ast_variables_destroy(var);

   return user;
}

static struct oh323_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime)
{
   struct oh323_peer *peer;
   struct ast_ha *oldha;
   int found = 0;

   peer = ASTOBJ_CONTAINER_FIND_UNLINK_FULL(&peerl, name, name, 0, 0, strcmp);

   if (peer)
      found++;
   else {
      if (!(peer = ast_calloc(1, sizeof(*peer))))
         return NULL;
      ASTOBJ_INIT(peer);
   }
   oldha = peer->ha;
   peer->ha = NULL;
   memcpy(&peer->options, &global_options, sizeof(peer->options));
   peer->options.dtmfmode = 0;
   peer->options.holdHandling = 0;
   peer->addr.sin_port = htons(h323_signalling_port);
   peer->addr.sin_family = AF_INET;
   if (!found && name)
      ast_copy_string(peer->name, name, sizeof(peer->name));

#if 0 /* XXX Port channel variables functionality from chan_sip XXX */
   if (peer->chanvars) {
      ast_variables_destroy(peer->chanvars);
      peer->chanvars = NULL;
   }
#endif
   /* Default settings for mailbox */
   peer->mailbox[0] = '\0';

   for (; v || ((v = alt) && !(alt = NULL)); v = v->next) {
      if (!update_common_options(v, &peer->options))
         continue;
      if (!strcasecmp(v->name, "host")) {
         if (!strcasecmp(v->value, "dynamic")) {
            ast_log(LOG_ERROR, "Dynamic host configuration not implemented.\n");
            ASTOBJ_UNREF(peer, oh323_destroy_peer);
            return NULL;
         }
         if (ast_get_ip(&peer->addr, v->value)) {
            ast_log(LOG_ERROR, "Could not determine IP for %s\n", v->value);
            ASTOBJ_UNREF(peer, oh323_destroy_peer);
            return NULL;
         }
      } else if (!strcasecmp(v->name, "port")) {
         peer->addr.sin_port = htons(atoi(v->value));
      } else if (!strcasecmp(v->name, "permit") ||
               !strcasecmp(v->name, "deny")) {
         int ha_error = 0;

         peer->ha = ast_append_ha(v->name, v->value, peer->ha, &ha_error);
         if (ha_error)
            ast_log(LOG_ERROR, "Bad ACL entry in configuration line %d : %s\n", v->lineno, v->value);
      } else if (!strcasecmp(v->name, "mailbox")) {
         ast_copy_string(peer->mailbox, v->value, sizeof(peer->mailbox));
      } else if (!strcasecmp(v->name, "hasvoicemail")) {
         if (ast_true(v->value) && ast_strlen_zero(peer->mailbox)) {
            ast_copy_string(peer->mailbox, name, sizeof(peer->mailbox));
         }
      }
   }
   if (!peer->options.dtmfmode)
      peer->options.dtmfmode = global_options.dtmfmode;
   if (peer->options.holdHandling == ~0)
      peer->options.holdHandling = 0;
   else if (!peer->options.holdHandling)
      peer->options.holdHandling = global_options.holdHandling;
   ASTOBJ_UNMARK(peer);
   ast_free_ha(oldha);
   return peer;
}

static struct oh323_peer *realtime_peer(const char *peername, struct sockaddr_in *sin)
{
   struct oh323_peer *peer;
   struct ast_variable *var;
   struct ast_variable *tmp;
   const char *addr = NULL;

   /* First check on peer name */
   if (peername)
      var = ast_load_realtime("h323", "name", peername, SENTINEL);
   else if (sin) /* Then check on IP address for dynamic peers */
      var = ast_load_realtime("h323", "host", addr = ast_inet_ntoa(sin->sin_addr), SENTINEL);
   else
      return NULL;

   if (!var)
      return NULL;

   for (tmp = var; tmp; tmp = tmp->next) {
      /* If this is type=user, then skip this object. */
      if (!strcasecmp(tmp->name, "type") &&
            !(!strcasecmp(tmp->value, "peer") || !strcasecmp(tmp->value, "friend"))) {
         ast_variables_destroy(var);
         return NULL;
      } else if (!peername && !strcasecmp(tmp->name, "name")) {
         peername = tmp->value;
      }
   }

   if (!peername) {  /* Did not find peer in realtime */
      ast_log(LOG_WARNING, "Cannot determine peer name for IP address %s\n", addr);
      ast_variables_destroy(var);
      return NULL;
   }

   /* Peer found in realtime, now build it in memory */
   peer = build_peer(peername, var, NULL, 1);

   ast_variables_destroy(var);

   return peer;
}

static int oh323_addrcmp_str(struct in_addr inaddr, char *addr)
{
   return strcmp(ast_inet_ntoa(inaddr), addr);
}

static struct oh323_user *find_user(const call_details_t *cd, int realtime)
{
   struct oh323_user *u;

   if (userbyalias)
      u = ASTOBJ_CONTAINER_FIND(&userl, cd->call_source_aliases);
   else
      u = ASTOBJ_CONTAINER_FIND_FULL(&userl, cd->sourceIp, addr.sin_addr, 0, 0, oh323_addrcmp_str);

   if (!u && realtime)
      u = realtime_user(cd);

   if (!u && h323debug)
      ast_debug(1, "Could not find user by name %s or address %s\n", cd->call_source_aliases, cd->sourceIp);

   return u;
}

static int oh323_addrcmp(struct sockaddr_in addr, struct sockaddr_in *sin)
{
   int res;

   if (!sin)
      res = -1;
   else
      res = inaddrcmp(&addr , sin);

   return res;
}

static struct oh323_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime)
{
   struct oh323_peer *p;

   if (peer)
      p = ASTOBJ_CONTAINER_FIND(&peerl, peer);
   else
      p = ASTOBJ_CONTAINER_FIND_FULL(&peerl, sin, addr, 0, 0, oh323_addrcmp);

   if (!p && realtime)
      p = realtime_peer(peer, sin);

   if (!p && h323debug)
      ast_debug(1, "Could not find peer by name %s or address %s\n", (peer ? peer : "<NONE>"), (sin ? ast_inet_ntoa(sin->sin_addr) : "<NONE>"));

   return p;
}

static int create_addr(struct oh323_pvt *pvt, char *opeer)
{
   struct hostent *hp;
   struct ast_hostent ahp;
   struct oh323_peer *p;
   int portno;
   int found = 0;
   char *port;
   char *hostn;
   char peer[256] = "";

   ast_copy_string(peer, opeer, sizeof(peer));
   port = strchr(peer, ':');
   if (port) {
      *port = '\0';
      port++;
   }
   pvt->sa.sin_family = AF_INET;
   p = find_peer(peer, NULL, 1);
   if (p) {
      found++;
      memcpy(&pvt->options, &p->options, sizeof(pvt->options));
      pvt->jointcapability = pvt->options.capability;
      if (pvt->options.dtmfmode) {
         if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
            pvt->nonCodecCapability |= AST_RTP_DTMF;
         } else {
            pvt->nonCodecCapability &= ~AST_RTP_DTMF;
         }
      }
      if (p->addr.sin_addr.s_addr) {
         pvt->sa.sin_addr = p->addr.sin_addr;
         pvt->sa.sin_port = p->addr.sin_port;
      }
      ASTOBJ_UNREF(p, oh323_destroy_peer);
   }
   if (!p && !found) {
      hostn = peer;
      if (port) {
         portno = atoi(port);
      } else {
         portno = h323_signalling_port;
      }
      hp = ast_gethostbyname(hostn, &ahp);
      if (hp) {
         memcpy(&pvt->sa.sin_addr, hp->h_addr, sizeof(pvt->sa.sin_addr));
         pvt->sa.sin_port = htons(portno);
         /* Look peer by address */
         p = find_peer(NULL, &pvt->sa, 1);
         memcpy(&pvt->options, (p ? &p->options : &global_options), sizeof(pvt->options));
         pvt->jointcapability = pvt->options.capability;
         if (p) {
            ASTOBJ_UNREF(p, oh323_destroy_peer);
         }
         if (pvt->options.dtmfmode) {
            if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
               pvt->nonCodecCapability |= AST_RTP_DTMF;
            } else {
               pvt->nonCodecCapability &= ~AST_RTP_DTMF;
            }
         }
         return 0;
      } else {
         ast_log(LOG_WARNING, "No such host: %s\n", peer);
         return -1;
      }
   } else if (!found) {
      return -1;
   } else {
      return 0;
   }
}
static struct ast_channel *oh323_request(const char *type, int format, void *data, int *cause)
{
   int oldformat;
   struct oh323_pvt *pvt;
   struct ast_channel *tmpc = NULL;
   char *dest = (char *)data;
   char *ext, *host;
   char *h323id = NULL;
   char tmp[256], tmp1[256];

   if (h323debug)
      ast_debug(1, "type=%s, format=%d, data=%s.\n", type, format, (char *)data);

   pvt = oh323_alloc(0);
   if (!pvt) {
      ast_log(LOG_WARNING, "Unable to build pvt data for '%s'\n", (char *)data);
      return NULL;
   }
   oldformat = format;
   format &= AST_FORMAT_AUDIO_MASK;
   if (!format) {
      ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", format);
      oh323_destroy(pvt);
      if (cause)
         *cause = AST_CAUSE_INCOMPATIBLE_DESTINATION;
      return NULL;
   }
   ast_copy_string(tmp, dest, sizeof(tmp));
   host = strchr(tmp, '@');
   if (host) {
      *host = '\0';
      host++;
      ext = tmp;
   } else {
      ext = strrchr(tmp, '/');
      if (ext)
         *ext++ = '\0';
      host = tmp;
   }
   strtok_r(host, "/", &(h323id));
   if (!ast_strlen_zero(h323id)) {
      h323_set_id(h323id);
   }
   if (ext) {
      ast_copy_string(pvt->exten, ext, sizeof(pvt->exten));
   }
   if (h323debug)
      ast_debug(1, "Extension: %s Host: %s\n", pvt->exten, host);

   if (gatekeeper_disable) {
      if (create_addr(pvt, host)) {
         oh323_destroy(pvt);
         if (cause)
            *cause = AST_CAUSE_DESTINATION_OUT_OF_ORDER;
         return NULL;
      }
   }
   else {
      memcpy(&pvt->options, &global_options, sizeof(pvt->options));
      pvt->jointcapability = pvt->options.capability;
      if (pvt->options.dtmfmode) {
         if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
            pvt->nonCodecCapability |= AST_RTP_DTMF;
         } else {
            pvt->nonCodecCapability &= ~AST_RTP_DTMF;
         }
      }
   }

   ast_mutex_lock(&caplock);
   /* Generate unique channel identifier */
   snprintf(tmp1, sizeof(tmp1)-1, "%s-%u", host, ++unique);
   tmp1[sizeof(tmp1)-1] = '\0';
   ast_mutex_unlock(&caplock);

   ast_mutex_lock(&pvt->lock);
   tmpc = __oh323_new(pvt, AST_STATE_DOWN, tmp1);
   ast_mutex_unlock(&pvt->lock);
   if (!tmpc) {
      oh323_destroy(pvt);
      if (cause)
         *cause = AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
   }
   ast_update_use_count();
   restart_monitor();
   return tmpc;
}

/*! \brief Find a call by alias */
static struct oh323_alias *find_alias(const char *source_aliases, int realtime)
{
   struct oh323_alias *a;

   a = ASTOBJ_CONTAINER_FIND(&aliasl, source_aliases);

   if (!a && realtime)
      a = realtime_alias(source_aliases);

   return a;
}

/*! \brief
  * Callback for sending digits from H.323 up to asterisk
  *
  */
static int receive_digit(unsigned call_reference, char digit, const char *token, int duration)
{
   struct oh323_pvt *pvt;
   int res;

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Received digit '%c' (%u ms) for call %s without private structure\n", digit, duration, token);
      return -1;
   }
   if (h323debug)
      ast_log(LOG_DTMF, "Received %s digit '%c' (%u ms) for call %s\n", (digit == ' ' ? "update for" : "new"), (digit == ' ' ? pvt->curDTMF : digit), duration, token);

   if (pvt->owner && !ast_channel_trylock(pvt->owner)) {
      if (digit == '!')
         res = ast_queue_control(pvt->owner, AST_CONTROL_FLASH);
      else {
         struct ast_frame f = {
            .frametype = AST_FRAME_DTMF_END,
            .subclass = digit,
            .samples = duration * 8,
            .len = duration,
            .src = "SEND_DIGIT",
         };
         if (digit == ' ') {     /* signalUpdate message */
            f.subclass = pvt->curDTMF;
            AST_SCHED_DEL(sched, pvt->DTMFsched);
         } else {          /* Regular input or signal message */
            if (pvt->DTMFsched >= 0) {
               /* We still don't send DTMF END from previous event, send it now */
               AST_SCHED_DEL(sched, pvt->DTMFsched);
               f.subclass = pvt->curDTMF;
               f.samples = f.len = 0;
               ast_queue_frame(pvt->owner, &f);
               /* Restore values */
               f.subclass = digit;
               f.samples = duration * 8;
               f.len = duration;
            }
            if (duration) {      /* This is a signal, signalUpdate follows */
               f.frametype = AST_FRAME_DTMF_BEGIN;
               pvt->DTMFsched = ast_sched_add(sched, duration, oh323_simulate_dtmf_end, pvt);
               if (h323debug)
                  ast_log(LOG_DTMF, "Scheduled DTMF END simulation for %d ms, id=%d\n", duration, pvt->DTMFsched);
            }
            pvt->curDTMF = digit;
         }
         res = ast_queue_frame(pvt->owner, &f);
      }
      ast_channel_unlock(pvt->owner);
   } else {
      if (digit == '!')
         pvt->newcontrol = AST_CONTROL_FLASH;
      else {
         pvt->newduration = duration;
         pvt->newdigit = digit;
      }
      res = 0;
   }
   ast_mutex_unlock(&pvt->lock);
   return res;
}

/*! \brief
  * Callback function used to inform the H.323 stack of the local rtp ip/port details
  *
  * \return Returns the local RTP information
  */
static struct rtp_info *external_rtp_create(unsigned call_reference, const char * token)
{
   struct oh323_pvt *pvt;
   struct sockaddr_in us;
   struct rtp_info *info;

   info = ast_calloc(1, sizeof(*info));
   if (!info) {
      ast_log(LOG_ERROR, "Unable to allocated info structure, this is very bad\n");
      return NULL;
   }
   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_free(info);
      ast_log(LOG_ERROR, "Unable to find call %s(%d)\n", token, call_reference);
      return NULL;
   }
   if (!pvt->rtp)
      __oh323_rtp_create(pvt);
   if (!pvt->rtp) {
      ast_mutex_unlock(&pvt->lock);
      ast_free(info);
      ast_log(LOG_ERROR, "No RTP stream is available for call %s (%d)", token, call_reference);
      return NULL;
   }
   /* figure out our local RTP port and tell the H.323 stack about it */
   ast_rtp_get_us(pvt->rtp, &us);
   ast_mutex_unlock(&pvt->lock);

   ast_copy_string(info->addr, ast_inet_ntoa(us.sin_addr), sizeof(info->addr));
   info->port = ntohs(us.sin_port);
   if (h323debug)
      ast_debug(1, "Sending RTP 'US' %s:%d\n", info->addr, info->port);
   return info;
}

/* 
 * Definition taken from rtp.c for rtpPayloadType because we need it here.
 */

struct rtpPayloadType {
   int isAstFormat;  /* whether the following code is an AST_FORMAT */
   int code;
};

/*! \brief
  * Call-back function passing remote ip/port information from H.323 to asterisk
  *
  * Returns nothing
  */
static void setup_rtp_connection(unsigned call_reference, const char *remoteIp, int remotePort, const char *token, int pt)
{
   struct oh323_pvt *pvt;
   struct sockaddr_in them;
   struct rtpPayloadType rtptype;
   int nativeformats_changed;
   enum { NEED_NONE, NEED_HOLD, NEED_UNHOLD } rtp_change = NEED_NONE;

   if (h323debug)
      ast_debug(1, "Setting up RTP connection for %s\n", token);

   /* Find the call or allocate a private structure if call not found */
   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: rtp\n");
      return;
   }
   if (pvt->alreadygone) {
      ast_mutex_unlock(&pvt->lock);
      return;
   }

   if (!pvt->rtp)
      __oh323_rtp_create(pvt);

   if ((pt == 2) && (pvt->jointcapability & AST_FORMAT_G726_AAL2)) {
      ast_rtp_set_rtpmap_type(pvt->rtp, pt, "audio", "G726-32", AST_RTP_OPT_G726_NONSTANDARD);
   }

   them.sin_family = AF_INET;
   /* only works for IPv4 */
   them.sin_addr.s_addr = inet_addr(remoteIp);
   them.sin_port = htons(remotePort);

   if (them.sin_addr.s_addr) {
      ast_rtp_set_peer(pvt->rtp, &them);
      if (pvt->recvonly) {
         pvt->recvonly = 0;
         rtp_change = NEED_UNHOLD;
      }
   } else {
      ast_rtp_stop(pvt->rtp);
      if (!pvt->recvonly) {
         pvt->recvonly = 1;
         rtp_change = NEED_HOLD;
      }
   }

   /* Change native format to reflect information taken from OLC/OLCAck */
   nativeformats_changed = 0;
   if (pt != 128 && pvt->rtp) {  /* Payload type is invalid, so try to use previously decided */
      rtptype = ast_rtp_lookup_pt(pvt->rtp, pt);
      if (h323debug)
         ast_debug(1, "Native format is set to %d from %d by RTP payload type %d\n", rtptype.code, pvt->nativeformats, pt);
      if (pvt->nativeformats != rtptype.code) {
         pvt->nativeformats = rtptype.code;
         nativeformats_changed = 1;
      }
   } else if (h323debug)
      ast_log(LOG_NOTICE, "Payload type is unknown, formats isn't changed\n");

   /* Don't try to lock the channel if nothing changed */
   if (nativeformats_changed || pvt->options.progress_audio || (rtp_change != NEED_NONE)) {
      if (pvt->owner && !ast_channel_trylock(pvt->owner)) {
         /* Re-build translation path only if native format(s) has been changed */
         if (pvt->owner->nativeformats != pvt->nativeformats) {
            if (h323debug)
               ast_debug(1, "Native format changed to %d from %d, read format is %d, write format is %d\n", pvt->nativeformats, pvt->owner->nativeformats, pvt->owner->readformat, pvt->owner->writeformat);
            pvt->owner->nativeformats = pvt->nativeformats;
            ast_set_read_format(pvt->owner, pvt->owner->readformat);
            ast_set_write_format(pvt->owner, pvt->owner->writeformat);
         }
         if (pvt->options.progress_audio)
            ast_queue_control(pvt->owner, AST_CONTROL_PROGRESS);
         switch (rtp_change) {
         case NEED_HOLD:
            ast_queue_control(pvt->owner, AST_CONTROL_HOLD);
            break;
         case NEED_UNHOLD:
            ast_queue_control(pvt->owner, AST_CONTROL_UNHOLD);
            break;
         default:
            break;
         }
         ast_channel_unlock(pvt->owner);
      }
      else {
         if (pvt->options.progress_audio)
            pvt->newcontrol = AST_CONTROL_PROGRESS;
         else if (rtp_change == NEED_HOLD)
            pvt->newcontrol = AST_CONTROL_HOLD;
         else if (rtp_change == NEED_UNHOLD)
            pvt->newcontrol = AST_CONTROL_UNHOLD;
         if (h323debug)
            ast_debug(1, "RTP connection preparation for %s is pending...\n", token);
      }
   }
   ast_mutex_unlock(&pvt->lock);

   if (h323debug)
      ast_debug(1, "RTP connection prepared for %s\n", token);

   return;
}

/*! \brief
  *   Call-back function to signal asterisk that the channel has been answered
  * Returns nothing
  */
static void connection_made(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Call %s answered\n", token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: connection\n");
      return;
   }

   /* Inform asterisk about remote party connected only on outgoing calls */
   if (!pvt->outgoing) {
      ast_mutex_unlock(&pvt->lock);
      return;
   }
   /* Do not send ANSWER message more than once */
   if (!pvt->connection_established) {
      pvt->connection_established = 1;
      update_state(pvt, -1, AST_CONTROL_ANSWER);
   }
   ast_mutex_unlock(&pvt->lock);
   return;
}

static int progress(unsigned call_reference, const char *token, int inband)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Received ALERT/PROGRESS message for %s tones\n", (inband ? "inband" : "self-generated"));

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Private structure not found in progress.\n");
      return -1;
   }
   if (!pvt->owner) {
      ast_mutex_unlock(&pvt->lock);
      ast_log(LOG_ERROR, "No Asterisk channel associated with private structure.\n");
      return -1;
   }
   update_state(pvt, -1, (inband ? AST_CONTROL_PROGRESS : AST_CONTROL_RINGING));
   ast_mutex_unlock(&pvt->lock);

   return 0;
}

/*! \brief
 *  Call-back function for incoming calls
 *
 *  Returns 1 on success
 */
static call_options_t *setup_incoming_call(call_details_t *cd)
{
   struct oh323_pvt *pvt;
   struct oh323_user *user = NULL;
   struct oh323_alias *alias = NULL;

   if (h323debug)
      ast_debug(1, "Setting up incoming call for %s\n", cd->call_token);

   /* allocate the call*/
   pvt = oh323_alloc(cd->call_reference);

   if (!pvt) {
      ast_log(LOG_ERROR, "Unable to allocate private structure, this is bad.\n");
      cleanup_call_details(cd);
      return NULL;
   }

   /* Populate the call details in the private structure */
   memcpy(&pvt->cd, cd, sizeof(pvt->cd));
   memcpy(&pvt->options, &global_options, sizeof(pvt->options));
   pvt->jointcapability = pvt->options.capability;

   if (h323debug) {
      ast_verb(3, "Setting up Call\n");
      ast_verb(3, " \tCall token:  [%s]\n", pvt->cd.call_token);
      ast_verb(3, " \tCalling party name:  [%s]\n", pvt->cd.call_source_name);
      ast_verb(3, " \tCalling party number:  [%s]\n", pvt->cd.call_source_e164);
      ast_verb(3, " \tCalled party name:  [%s]\n", pvt->cd.call_dest_alias);
      ast_verb(3, " \tCalled party number:  [%s]\n", pvt->cd.call_dest_e164);
      if (pvt->cd.redirect_reason >= 0)
         ast_verb(3, " \tRedirecting party number:  [%s] (reason %d)\n", pvt->cd.redirect_number, pvt->cd.redirect_reason);
      ast_verb(3, " \tCalling party IP:  [%s]\n", pvt->cd.sourceIp);
   }

   /* Decide if we are allowing Gatekeeper routed calls*/
   if ((!strcasecmp(cd->sourceIp, gatekeeper)) && (gkroute == -1) && !gatekeeper_disable) {
      if (!ast_strlen_zero(cd->call_dest_e164)) {
         ast_copy_string(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten));
         ast_copy_string(pvt->context, default_context, sizeof(pvt->context));
      } else {
         alias = find_alias(cd->call_dest_alias, 1);
         if (!alias) {
            ast_log(LOG_ERROR, "Call for %s rejected, alias not found\n", cd->call_dest_alias);
            oh323_destroy(pvt);
            return NULL;
         }
         ast_copy_string(pvt->exten, alias->name, sizeof(pvt->exten));
         ast_copy_string(pvt->context, alias->context, sizeof(pvt->context));
      }
   } else {
      /* Either this call is not from the Gatekeeper
         or we are not allowing gk routed calls */
      user = find_user(cd, 1);
      if (!user) {
         if (!acceptAnonymous) {
            ast_log(LOG_NOTICE, "Anonymous call from '%s@%s' rejected\n", pvt->cd.call_source_aliases, pvt->cd.sourceIp);
            oh323_destroy(pvt);
            return NULL;
         }
         if (ast_strlen_zero(default_context)) {
            ast_log(LOG_ERROR, "Call from '%s@%s' rejected due to no default context\n", pvt->cd.call_source_aliases, pvt->cd.sourceIp);
            oh323_destroy(pvt);
            return NULL;
         }
         ast_copy_string(pvt->context, default_context, sizeof(pvt->context));
         if (!ast_strlen_zero(pvt->cd.call_dest_e164)) {
            ast_copy_string(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten));
         } else {
            ast_copy_string(pvt->exten, cd->call_dest_alias, sizeof(pvt->exten));
         }
         if (h323debug)
            ast_debug(1, "Sending %s@%s to context [%s] extension %s\n", cd->call_source_aliases, cd->sourceIp, pvt->context, pvt->exten);
      } else {
         if (user->host) {
            if (strcasecmp(cd->sourceIp, ast_inet_ntoa(user->addr.sin_addr))) {
               if (ast_strlen_zero(user->context)) {
                  if (ast_strlen_zero(default_context)) {
                     ast_log(LOG_ERROR, "Call from '%s' rejected due to non-matching IP address (%s) and no default context\n", user->name, cd->sourceIp);
                     oh323_destroy(pvt);
                     ASTOBJ_UNREF(user, oh323_destroy_user);
                     return NULL;
                  }
                  ast_copy_string(pvt->context, default_context, sizeof(pvt->context));
               } else {
                  ast_copy_string(pvt->context, user->context, sizeof(pvt->context));
               }
               pvt->exten[0] = 'i';
               pvt->exten[1] = '\0';
               ast_log(LOG_ERROR, "Call from '%s' rejected due to non-matching IP address (%s)s\n", user->name, cd->sourceIp);
               oh323_destroy(pvt);
               ASTOBJ_UNREF(user, oh323_destroy_user);
               return NULL;   /* XXX: Hmmm... Why to setup context if we drop connection immediately??? */
            }
         }
         ast_copy_string(pvt->context, user->context, sizeof(pvt->context));
         memcpy(&pvt->options, &user->options, sizeof(pvt->options));
         pvt->jointcapability = pvt->options.capability;
         if (!ast_strlen_zero(pvt->cd.call_dest_e164)) {
            ast_copy_string(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten));
         } else {
            ast_copy_string(pvt->exten, cd->call_dest_alias, sizeof(pvt->exten));
         }
         if (!ast_strlen_zero(user->accountcode)) {
            ast_copy_string(pvt->accountcode, user->accountcode, sizeof(pvt->accountcode));
         }
         if (user->amaflags) {
            pvt->amaflags = user->amaflags;
         }
         ASTOBJ_UNREF(user, oh323_destroy_user);
      }
   }
   return &pvt->options;
}

/*! \brief
 * Call-back function to start PBX when OpenH323 ready to serve incoming call
 *
 * Returns 1 on success
 */
static int answer_call(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;
   struct ast_channel *c = NULL;
   enum {ext_original, ext_s, ext_i, ext_notexists} try_exten;
   char tmp_exten[sizeof(pvt->exten)];

   if (h323debug)
      ast_debug(1, "Preparing Asterisk to answer for %s\n", token);

   /* Find the call or allocate a private structure if call not found */
   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: answer_call\n");
      return 0;
   }
   /* Check if requested extension@context pair exists in the dialplan */
   ast_copy_string(tmp_exten, pvt->exten, sizeof(tmp_exten));

   /* Try to find best extension in specified context */
   if ((tmp_exten[0] != '\0') && (tmp_exten[1] == '\0')) {
      if (tmp_exten[0] == 's')
         try_exten = ext_s;
      else if (tmp_exten[0] == 'i')
         try_exten = ext_i;
      else
         try_exten = ext_original;
   } else
      try_exten = ext_original;
   do {
      if (ast_exists_extension(NULL, pvt->context, tmp_exten, 1, NULL))
         break;
      switch (try_exten) {
      case ext_original:
         tmp_exten[0] = 's';
         tmp_exten[1] = '\0';
         try_exten = ext_s;
         break;
      case ext_s:
         tmp_exten[0] = 'i';
         try_exten = ext_i;
         break;
      case ext_i:
         try_exten = ext_notexists;
         break;
      default:
         break;
      }
   } while (try_exten != ext_notexists);

   /* Drop the call if we don't have <exten>, s and i extensions */
   if (try_exten == ext_notexists) {
      ast_log(LOG_NOTICE, "Dropping call because extensions '%s', 's' and 'i' doesn't exists in context [%s]\n", pvt->exten, pvt->context);
      ast_mutex_unlock(&pvt->lock);
      h323_clear_call(token, AST_CAUSE_UNALLOCATED);
      return 0;
   } else if ((try_exten != ext_original) && (strcmp(pvt->exten, tmp_exten) != 0)) {
      if (h323debug)
         ast_debug(1, "Going to extension %s@%s because %s@%s isn't exists\n", tmp_exten, pvt->context, pvt->exten, pvt->context);
      ast_copy_string(pvt->exten, tmp_exten, sizeof(pvt->exten));
   }

   /* allocate a channel and tell asterisk about it */
   c = __oh323_new(pvt, AST_STATE_RINGING, pvt->cd.call_token);

   /* And release when done */
   ast_mutex_unlock(&pvt->lock);
   if (!c) {
      ast_log(LOG_ERROR, "Couldn't create channel. This is bad\n");
      return 0;
   }
   return 1;
}

/*! \brief
 * Call-back function to establish an outgoing H.323 call
 *
 * Returns 1 on success
 */
static int setup_outgoing_call(call_details_t *cd)
{
   /* Use argument here or free it immediately */
   cleanup_call_details(cd);

   return 1;
}

/*! \brief
  *  Call-back function to signal asterisk that the channel is ringing
  *  Returns nothing
  */
static void chan_ringing(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Ringing on %s\n", token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: ringing\n");
      return;
   }
   if (!pvt->owner) {
      ast_mutex_unlock(&pvt->lock);
      ast_log(LOG_ERROR, "Channel has no owner\n");
      return;
   }
   update_state(pvt, AST_STATE_RINGING, AST_CONTROL_RINGING);
   ast_mutex_unlock(&pvt->lock);
   return;
}

/*! \brief
  * Call-back function to cleanup communication
  * Returns nothing,
  */
static void cleanup_connection(unsigned call_reference, const char *call_token)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Cleaning connection to %s\n", call_token);

   while (1) {
      pvt = find_call_locked(call_reference, call_token);
      if (!pvt) {
         if (h323debug)
            ast_debug(1, "No connection for %s\n", call_token);
         return;
      }
      if (!pvt->owner || !ast_channel_trylock(pvt->owner))
         break;
#if 1
      ast_log(LOG_NOTICE, "Avoiding H.323 destory deadlock on %s\n", call_token);
#ifdef DEBUG_THREADS
      /* XXX to be completed
       * If we want to print more info on who is holding the lock,
       * implement the relevant code in lock.h and use the routines
       * supplied there.
       */
#endif
#endif
      ast_mutex_unlock(&pvt->lock);
      usleep(1);
   }
   if (pvt->rtp) {
      /* Immediately stop RTP */
      ast_rtp_destroy(pvt->rtp);
      pvt->rtp = NULL;
   }
   /* Free dsp used for in-band DTMF detection */
   if (pvt->vad) {
      ast_dsp_free(pvt->vad);
      pvt->vad = NULL;
   }
   cleanup_call_details(&pvt->cd);
   pvt->alreadygone = 1;
   /* Send hangup */
   if (pvt->owner) {
      pvt->owner->_softhangup |= AST_SOFTHANGUP_DEV;
      ast_queue_hangup(pvt->owner);
      ast_channel_unlock(pvt->owner);
   }
   ast_mutex_unlock(&pvt->lock);
   if (h323debug)
      ast_debug(1, "Connection to %s cleaned\n", call_token);
   return;
}

static void hangup_connection(unsigned int call_reference, const char *token, int cause)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Hanging up connection to %s with cause %d\n", token, cause);

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      if (h323debug)
         ast_debug(1, "Connection to %s already cleared\n", token);
      return;
   }
   if (pvt->owner && !ast_channel_trylock(pvt->owner)) {
      pvt->owner->_softhangup |= AST_SOFTHANGUP_DEV;
      pvt->owner->hangupcause = pvt->hangupcause = cause;
      ast_queue_hangup_with_cause(pvt->owner, cause);
      ast_channel_unlock(pvt->owner);
   }
   else {
      pvt->needhangup = 1;
      pvt->hangupcause = cause;
      if (h323debug)
         ast_debug(1, "Hangup for %s is pending\n", token);
   }
   ast_mutex_unlock(&pvt->lock);
}

static void set_dtmf_payload(unsigned call_reference, const char *token, int payload, int is_cisco)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Setting %s DTMF payload to %d on %s\n", (is_cisco ? "Cisco" : "RFC2833"), payload, token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      return;
   }
   if (pvt->rtp) {
      ast_rtp_set_rtpmap_type(pvt->rtp, payload, "audio", (is_cisco ? "cisco-telephone-event" : "telephone-event"), 0);
   }
   pvt->dtmf_pt[is_cisco ? 1 : 0] = payload;
   ast_mutex_unlock(&pvt->lock);
   if (h323debug)
      ast_debug(1, "DTMF payload on %s set to %d\n", token, payload);
}

static void set_peer_capabilities(unsigned call_reference, const char *token, int capabilities, struct ast_codec_pref *prefs)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Got remote capabilities from connection %s\n", token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt)
      return;
   pvt->peercapability = capabilities;
   pvt->jointcapability = pvt->options.capability & capabilities;
   if (prefs) {
      memcpy(&pvt->peer_prefs, prefs, sizeof(pvt->peer_prefs));
      if (h323debug) {
         int i;
         for (i = 0; i < 32; ++i) {
            if (!prefs->order[i])
               break;
            ast_debug(1, "prefs[%d]=%s:%d\n", i, (prefs->order[i] ? ast_getformatname(1 << (prefs->order[i]-1)) : "<none>"), prefs->framing[i]);
         }
      }
      if (pvt->rtp) {
         if (pvt->options.autoframing) {
            ast_debug(2, "Autoframing option set, using peer's packetization settings\n");
            ast_rtp_codec_setpref(pvt->rtp, &pvt->peer_prefs);
         } else {
            ast_debug(2, "Autoframing option not set, ignoring peer's packetization settings\n");
            ast_rtp_codec_setpref(pvt->rtp, &pvt->options.prefs);
         }
      }
   }
   ast_mutex_unlock(&pvt->lock);
}

static void set_local_capabilities(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;
   int capability, dtmfmode, pref_codec;
   struct ast_codec_pref prefs;

   if (h323debug)
      ast_debug(1, "Setting capabilities for connection %s\n", token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt)
      return;
   capability = (pvt->jointcapability) ? pvt->jointcapability : pvt->options.capability;
   dtmfmode = pvt->options.dtmfmode;
   prefs = pvt->options.prefs;
   pref_codec = pvt->pref_codec;
   ast_mutex_unlock(&pvt->lock);
   h323_set_capabilities(token, capability, dtmfmode, &prefs, pref_codec);

   if (h323debug) {
      int i;
      for (i = 0; i < 32; i++) {
         if (!prefs.order[i])
            break;
         ast_debug(1, "local prefs[%d]=%s:%d\n", i, (prefs.order[i] ? ast_getformatname(1 << (prefs.order[i]-1)) : "<none>"), prefs.framing[i]);
      }
      ast_debug(1, "Capabilities for connection %s is set\n", token);
   }
}

static void remote_hold(unsigned call_reference, const char *token, int is_hold)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_debug(1, "Setting %shold status for connection %s\n", (is_hold ? "" : "un"), token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt)
      return;
   if (pvt->owner && !ast_channel_trylock(pvt->owner)) {
      if (is_hold)
         ast_queue_control(pvt->owner, AST_CONTROL_HOLD);
      else
         ast_queue_control(pvt->owner, AST_CONTROL_UNHOLD);
      ast_channel_unlock(pvt->owner);
   }
   else {
      if (is_hold)
         pvt->newcontrol = AST_CONTROL_HOLD;
      else
         pvt->newcontrol = AST_CONTROL_UNHOLD;
   }
   ast_mutex_unlock(&pvt->lock);
}

static void *do_monitor(void *data)
{
   int res;
   int reloading;
   struct oh323_pvt *oh323 = NULL;

   for(;;) {
      /* Check for a reload request */
      ast_mutex_lock(&h323_reload_lock);
      reloading = h323_reloading;
      h323_reloading = 0;
      ast_mutex_unlock(&h323_reload_lock);
      if (reloading) {
         ast_verb(1, "Reloading H.323\n");
         h323_do_reload();
      }
      /* Check for interfaces needing to be killed */
      if (!ast_mutex_trylock(&iflock)) {
#if 1
         do {
            for (oh323 = iflist; oh323; oh323 = oh323->next) {
               if (!ast_mutex_trylock(&oh323->lock)) {
                  if (oh323->needdestroy) {
                     __oh323_destroy(oh323);
                     break;
                  }
                  ast_mutex_unlock(&oh323->lock);
               }
            }
         } while (/*oh323*/ 0);
#else
restartsearch:
         oh323 = iflist;
         while(oh323) {
            if (!ast_mutex_trylock(&oh323->lock)) {
               if (oh323->needdestroy) {
                  __oh323_destroy(oh323);
                  goto restartsearch;
               }
               ast_mutex_unlock(&oh323->lock);
               oh323 = oh323->next;
            }
         }
#endif
         ast_mutex_unlock(&iflock);
      } else
         oh323 = (struct oh323_pvt *)1;   /* Force fast loop */
      pthread_testcancel();
      /* Wait for sched or io */
      res = ast_sched_wait(sched);
      if ((res < 0) || (res > 1000)) {
         res = 1000;
      }
      /* Do not wait if some channel(s) is destroyed, probably, more available too */
      if (oh323)
         res = 1;
      res = ast_io_wait(io, res);
      pthread_testcancel();
      ast_mutex_lock(&monlock);
      if (res >= 0) {
         ast_sched_runq(sched);
      }
      ast_mutex_unlock(&monlock);
   }
   /* Never reached */
   return NULL;
}

static int restart_monitor(void)
{
   /* If we're supposed to be stopped -- stay stopped */
   if (ast_mutex_lock(&monlock)) {
      ast_log(LOG_WARNING, "Unable to lock monitor\n");
      return -1;
   }
   if (monitor_thread == AST_PTHREADT_STOP) {
      ast_mutex_unlock(&monlock);
      return 0;
   }
   if (monitor_thread == pthread_self()) {
      ast_mutex_unlock(&monlock);
      ast_log(LOG_WARNING, "Cannot kill myself\n");
      return -1;
   }
   if (monitor_thread && (monitor_thread != AST_PTHREADT_NULL)) {
      /* Wake up the thread */
      pthread_kill(monitor_thread, SIGURG);
   } else {
      /* Start a new monitor */
      if (ast_pthread_create_background(&monitor_thread, NULL, do_monitor, NULL) < 0) {
         monitor_thread = AST_PTHREADT_NULL;
         ast_mutex_unlock(&monlock);
         ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
         return -1;
      }
   }
   ast_mutex_unlock(&monlock);
   return 0;
}

static char *handle_cli_h323_set_trace(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 set trace [off]";
      e->usage =
         "Usage: h323 set trace (off|<trace level>)\n"
         "       Enable/Disable H.323 stack tracing for debugging purposes\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 4)
      return CLI_SHOWUSAGE;
   if (!strcasecmp(a->argv[3], "off")) {
      h323_debug(0, 0);
      ast_cli(a->fd, "H.323 Trace Disabled\n");
   } else {
      int tracelevel = atoi(a->argv[3]);
      h323_debug(1, tracelevel);
      ast_cli(a->fd, "H.323 Trace Enabled (Trace Level: %d)\n", tracelevel);
   }
   return CLI_SUCCESS;
}

static char *handle_cli_h323_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 set debug [off]";
      e->usage =
         "Usage: h323 set debug [off]\n"
         "       Enable/Disable H.323 debugging output\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc < 3 || a->argc > 4)
      return CLI_SHOWUSAGE;
   if (a->argc == 4 && strcasecmp(a->argv[3], "off"))
      return CLI_SHOWUSAGE;

   h323debug = (a->argc == 3) ? 1 : 0;
   ast_cli(a->fd, "H.323 Debugging %s\n", h323debug ? "Enabled" : "Disabled");
   return CLI_SUCCESS;
}

static char *handle_cli_h323_cycle_gk(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 cycle gk";
      e->usage =
         "Usage: h323 cycle gk\n"
         "       Manually re-register with the Gatekeper (Currently Disabled)\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 3)
      return CLI_SHOWUSAGE;

   h323_gk_urq();

   /* Possibly register with a GK */
   if (!gatekeeper_disable) {
      if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
         ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
      }
   }
   return CLI_SUCCESS;
}

static char *handle_cli_h323_hangup(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 hangup";
      e->usage =
         "Usage: h323 hangup <token>\n"
         "       Manually try to hang up the call identified by <token>\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 3)
      return CLI_SHOWUSAGE;
   if (h323_soft_hangup(a->argv[2])) {
      ast_verb(3, "Hangup succeeded on %s\n", a->argv[2]);
   } else {
      ast_verb(3, "Hangup failed for %s\n", a->argv[2]);
   }
   return CLI_SUCCESS;
}

static char *handle_cli_h323_show_tokens(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 show tokens";
      e->usage =
         "Usage: h323 show tokens\n"
         "       Print out all active call tokens\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 3)
      return CLI_SHOWUSAGE;

   h323_show_tokens();

   return CLI_SUCCESS;
}

static char *handle_cli_h323_show_version(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 show version";
      e->usage =
         "Usage: h323 show version\n"
         "     Show the version of the H.323 library in use\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 3)
      return CLI_SHOWUSAGE;

   h323_show_version();
   
   return CLI_SUCCESS;
}

static struct ast_cli_entry cli_h323[] = {
   AST_CLI_DEFINE(handle_cli_h323_set_trace,    "Enable/Disable H.323 Stack Tracing"),
   AST_CLI_DEFINE(handle_cli_h323_set_debug,    "Enable/Disable H.323 Debugging"),
   AST_CLI_DEFINE(handle_cli_h323_cycle_gk,     "Manually re-register with the Gatekeper"),
   AST_CLI_DEFINE(handle_cli_h323_hangup,       "Manually try to hang up a call"),
   AST_CLI_DEFINE(handle_cli_h323_show_tokens,  "Show all active call tokens"),
   AST_CLI_DEFINE(handle_cli_h323_show_version, "Show the version of the H.323 library in use"),
};

static void delete_users(void)
{
   int pruned = 0;

   /* Delete all users */
   ASTOBJ_CONTAINER_WRLOCK(&userl);
   ASTOBJ_CONTAINER_TRAVERSE(&userl, 1, do {
      ASTOBJ_RDLOCK(iterator);
      ASTOBJ_MARK(iterator);
      ++pruned;
      ASTOBJ_UNLOCK(iterator);
   } while (0) );
   if (pruned) {
      ASTOBJ_CONTAINER_PRUNE_MARKED(&userl, oh323_destroy_user);
   }
   ASTOBJ_CONTAINER_UNLOCK(&userl);

   ASTOBJ_CONTAINER_WRLOCK(&peerl);
   ASTOBJ_CONTAINER_TRAVERSE(&peerl, 1, do {
      ASTOBJ_RDLOCK(iterator);
      ASTOBJ_MARK(iterator);
      ASTOBJ_UNLOCK(iterator);
   } while (0) );
   ASTOBJ_CONTAINER_UNLOCK(&peerl);
}

static void delete_aliases(void)
{
   int pruned = 0;

   /* Delete all aliases */
   ASTOBJ_CONTAINER_WRLOCK(&aliasl);
   ASTOBJ_CONTAINER_TRAVERSE(&aliasl, 1, do {
      ASTOBJ_RDLOCK(iterator);
      ASTOBJ_MARK(iterator);
      ++pruned;
      ASTOBJ_UNLOCK(iterator);
   } while (0) );
   if (pruned) {
      ASTOBJ_CONTAINER_PRUNE_MARKED(&aliasl, oh323_destroy_alias);
   }
   ASTOBJ_CONTAINER_UNLOCK(&aliasl);
}

static void prune_peers(void)
{
   /* Prune peers who still are supposed to be deleted */
   ASTOBJ_CONTAINER_PRUNE_MARKED(&peerl, oh323_destroy_peer);
}

static int reload_config(int is_reload)
{
   struct ast_config *cfg, *ucfg;
   struct ast_variable *v;
   struct oh323_peer *peer = NULL;
   struct oh323_user *user = NULL;
   struct oh323_alias *alias = NULL;
   struct ast_hostent ahp; struct hostent *hp;
   char *cat;
   const char *utype;
   int is_user, is_peer, is_alias;
   char _gatekeeper[100];
   int gk_discover, gk_disable, gk_changed;
   struct ast_flags config_flags = { is_reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };

   cfg = ast_config_load(config, config_flags);

   /* We *must* have a config file otherwise stop immediately */
   if (!cfg) {
      ast_log(LOG_NOTICE, "Unable to load config %s, H.323 disabled\n", config);
      return 1;
   } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
      ucfg = ast_config_load("users.conf", config_flags);
      if (ucfg == CONFIG_STATUS_FILEUNCHANGED)
         return 0;
      ast_clear_flag(&config_flags, CONFIG_FLAG_FILEUNCHANGED);
      cfg = ast_config_load(config, config_flags);
   } else {
      ast_clear_flag(&config_flags, CONFIG_FLAG_FILEUNCHANGED);
      ucfg = ast_config_load("users.conf", config_flags);
   }

   if (is_reload) {
      delete_users();
      delete_aliases();
      prune_peers();
   }

   /* fire up the H.323 Endpoint */
   if (!h323_end_point_exist()) {
      h323_end_point_create();
   }
   ast_copy_string(_gatekeeper, gatekeeper, sizeof(_gatekeeper));
   gk_discover = gatekeeper_discover;
   gk_disable = gatekeeper_disable;
   memset(&bindaddr, 0, sizeof(bindaddr));
   memset(&global_options, 0, sizeof(global_options));
   global_options.fastStart = 1;
   global_options.h245Tunneling = 1;
   global_options.dtmfcodec[0] = H323_DTMF_RFC2833_PT;
   global_options.dtmfcodec[1] = H323_DTMF_CISCO_PT;
   global_options.dtmfmode = 0;
   global_options.holdHandling = 0;
   global_options.capability = GLOBAL_CAPABILITY;
   global_options.bridge = 1;    /* Do native bridging by default */
   global_options.autoframing = 0;
   strcpy(default_context, "default");
   h323_signalling_port = 1720;
   gatekeeper_disable = 1;
   gatekeeper_discover = 0;
   gkroute = 0;
   userbyalias = 1;
   acceptAnonymous = 1;
   tos = 0;
   cos = 0;

   /* Copy the default jb config over global_jbconf */
   memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));

   if (ucfg) {
      struct ast_variable *gen;
      int genhas_h323;
      const char *has_h323;

      genhas_h323 = ast_true(ast_variable_retrieve(ucfg, "general", "hash323"));
      gen = ast_variable_browse(ucfg, "general");
      for (cat = ast_category_browse(ucfg, NULL); cat; cat = ast_category_browse(ucfg, cat)) {
         if (strcasecmp(cat, "general")) {
            has_h323 = ast_variable_retrieve(ucfg, cat, "hash323");
            if (ast_true(has_h323) || (!has_h323 && genhas_h323)) {
               user = build_user(cat, gen, ast_variable_browse(ucfg, cat), 0);
               if (user) {
                  ASTOBJ_CONTAINER_LINK(&userl, user);
                  ASTOBJ_UNREF(user, oh323_destroy_user);
               }
               peer = build_peer(cat, gen, ast_variable_browse(ucfg, cat), 0);
               if (peer) {
                  ASTOBJ_CONTAINER_LINK(&peerl, peer);
                  ASTOBJ_UNREF(peer, oh323_destroy_peer);
               }
            }
         }
      }
      ast_config_destroy(ucfg);
   }

   for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
      /* handle jb conf */
      if (!ast_jb_read_conf(&global_jbconf, v->name, v->value))
         continue;
      /* Create the interface list */
      if (!strcasecmp(v->name, "port")) {
         h323_signalling_port = (int)strtol(v->value, NULL, 10);
      } else if (!strcasecmp(v->name, "bindaddr")) {
         if (!(hp = ast_gethostbyname(v->value, &ahp))) {
            ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);
         } else {
            memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
         }
      } else if (!strcasecmp(v->name, "tos")) { /* Needs to be removed in next release */
         ast_log(LOG_WARNING, "The \"tos\" setting is deprecated in this version of Asterisk. Please change to \"tos_audio\".\n");
         if (ast_str2tos(v->value, &tos)) {
            ast_log(LOG_WARNING, "Invalid tos_audio value at line %d, refer to QoS documentation\n", v->lineno);        
         }
      } else if (!strcasecmp(v->name, "tos_audio")) {
         if (ast_str2tos(v->value, &tos)) {
            ast_log(LOG_WARNING, "Invalid tos_audio value at line %d, refer to QoS documentation\n", v->lineno);        
         }
      } else if (!strcasecmp(v->name, "cos")) {
         ast_log(LOG_WARNING, "The \"cos\" setting is deprecated in this version of Asterisk. Please change to \"cos_audio\".\n");
         if (ast_str2cos(v->value, &cos)) {
            ast_log(LOG_WARNING, "Invalid cos_audio value at line %d, refer to QoS documentation\n", v->lineno);        
         }
      } else if (!strcasecmp(v->name, "cos_audio")) {
         if (ast_str2cos(v->value, &cos)) {
            ast_log(LOG_WARNING, "Invalid cos_audio value at line %d, refer to QoS documentation\n", v->lineno);        
         }
      } else if (!strcasecmp(v->name, "gatekeeper")) {
         if (!strcasecmp(v->value, "DISABLE")) {
            gatekeeper_disable = 1;
         } else if (!strcasecmp(v->value, "DISCOVER")) {
            gatekeeper_disable = 0;
            gatekeeper_discover = 1;
         } else {
            gatekeeper_disable = 0;
            ast_copy_string(gatekeeper, v->value, sizeof(gatekeeper));
         }
      } else if (!strcasecmp(v->name, "secret")) {
         ast_copy_string(secret, v->value, sizeof(secret));
      } else if (!strcasecmp(v->name, "AllowGKRouted")) {
         gkroute = ast_true(v->value);
      } else if (!strcasecmp(v->name, "context")) {
         ast_copy_string(default_context, v->value, sizeof(default_context));
         ast_verb(2, "Setting default context to %s\n", default_context);
      } else if (!strcasecmp(v->name, "UserByAlias")) {
         userbyalias = ast_true(v->value);
      } else if (!strcasecmp(v->name, "AcceptAnonymous")) {
         acceptAnonymous = ast_true(v->value);
      } else if (!update_common_options(v, &global_options)) {
         /* dummy */
      }
   }
   if (!global_options.dtmfmode)
      global_options.dtmfmode = H323_DTMF_RFC2833;
   if (global_options.holdHandling == ~0)
      global_options.holdHandling = 0;
   else if (!global_options.holdHandling)
      global_options.holdHandling = H323_HOLD_H450;

   for (cat = ast_category_browse(cfg, NULL); cat; cat = ast_category_browse(cfg, cat)) {
      if (strcasecmp(cat, "general")) {
         utype = ast_variable_retrieve(cfg, cat, "type");
         if (utype) {
            is_user = is_peer = is_alias = 0;
            if (!strcasecmp(utype, "user"))
               is_user = 1;
            else if (!strcasecmp(utype, "peer"))
               is_peer = 1;
            else if (!strcasecmp(utype, "friend"))
               is_user = is_peer = 1;
            else if (!strcasecmp(utype, "h323") || !strcasecmp(utype, "alias"))
               is_alias = 1;
            else {
               ast_log(LOG_WARNING, "Unknown type '%s' for '%s' in %s\n", utype, cat, config);
               continue;
            }
            if (is_user) {
               user = build_user(cat, ast_variable_browse(cfg, cat), NULL, 0);
               if (user) {
                  ASTOBJ_CONTAINER_LINK(&userl, user);
                  ASTOBJ_UNREF(user, oh323_destroy_user);
               }
            }
            if (is_peer) {
               peer = build_peer(cat, ast_variable_browse(cfg, cat), NULL, 0);
               if (peer) {
                  ASTOBJ_CONTAINER_LINK(&peerl, peer);
                  ASTOBJ_UNREF(peer, oh323_destroy_peer);
               }
            }
            if (is_alias) {
               alias = build_alias(cat, ast_variable_browse(cfg, cat), NULL, 0);
               if (alias) {
                  ASTOBJ_CONTAINER_LINK(&aliasl, alias);
                  ASTOBJ_UNREF(alias, oh323_destroy_alias);
               }
            }
         } else {
            ast_log(LOG_WARNING, "Section '%s' lacks type\n", cat);
         }
      }
   }
   ast_config_destroy(cfg);

   /* Register our H.323 aliases if any*/
   ASTOBJ_CONTAINER_WRLOCK(&aliasl);
   ASTOBJ_CONTAINER_TRAVERSE(&aliasl, 1, do {
      ASTOBJ_RDLOCK(iterator);
      if (h323_set_alias(iterator)) {
         ast_log(LOG_ERROR, "Alias %s rejected by endpoint\n", alias->name);
         ASTOBJ_UNLOCK(iterator);
         continue;
      }
      ASTOBJ_UNLOCK(iterator);
   } while (0) );
   ASTOBJ_CONTAINER_UNLOCK(&aliasl);

   /* Don't touch GK if nothing changed because URQ will drop all existing calls */
   gk_changed = 0;
   if (gatekeeper_disable != gk_disable)
      gk_changed = is_reload;
   else if(!gatekeeper_disable && (gatekeeper_discover != gk_discover))
      gk_changed = is_reload;
   else if(!gatekeeper_disable && (strncmp(_gatekeeper, gatekeeper, sizeof(_gatekeeper)) != 0))
      gk_changed = is_reload;
   if (gk_changed) {
      if(!gk_disable)
         h323_gk_urq();
      if (!gatekeeper_disable) {
         if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
            ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
            gatekeeper_disable = 1;
         }
      }
   }
   return 0;
}

static int h323_reload(void)
{
   ast_mutex_lock(&h323_reload_lock);
   if (h323_reloading) {
      ast_verbose("Previous H.323 reload not yet done\n");
   } else {
      h323_reloading = 1;
   }
   ast_mutex_unlock(&h323_reload_lock);
   restart_monitor();
   return 0;
}

static char *handle_cli_h323_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "h323 reload";
      e->usage =
         "Usage: h323 reload\n"
         "       Reloads H.323 configuration from h323.conf\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 2)
      return CLI_SHOWUSAGE;

   h323_reload();

   return CLI_SUCCESS;
}

static int h323_do_reload(void)
{
   reload_config(1);
   return 0;
}

static int reload(void)
{
   if (!sched || !io) {
      ast_log(LOG_NOTICE, "Unload and load chan_h323.so again in order to receive configuration changes.\n");
      return 0;
   }
   return h323_reload();
}

static struct ast_cli_entry cli_h323_reload =
   AST_CLI_DEFINE(handle_cli_h323_reload, "Reload H.323 configuration");

static enum ast_rtp_get_result oh323_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp)
{
   struct oh323_pvt *pvt;
   enum ast_rtp_get_result res = AST_RTP_TRY_PARTIAL;

   if (!(pvt = (struct oh323_pvt *)chan->tech_pvt))
      return AST_RTP_GET_FAILED;

   ast_mutex_lock(&pvt->lock);
   *rtp = pvt->rtp;
#if 0
   if (pvt->options.bridge) {
      res = AST_RTP_TRY_NATIVE;
   }
#endif
   ast_mutex_unlock(&pvt->lock);

   return res;
}

static enum ast_rtp_get_result oh323_get_vrtp_peer(struct ast_channel *chan, struct ast_rtp **rtp)
{
   return AST_RTP_GET_FAILED;
}

static char *convertcap(int cap)
{
   switch (cap) {
   case AST_FORMAT_G723_1:
      return "G.723";
   case AST_FORMAT_GSM:
      return "GSM";
   case AST_FORMAT_ULAW:
      return "ULAW";
   case AST_FORMAT_ALAW:
      return "ALAW";
   case AST_FORMAT_G722:
      return "G.722";
   case AST_FORMAT_ADPCM:
      return "G.728";
   case AST_FORMAT_G729A:
      return "G.729";
   case AST_FORMAT_SPEEX:
      return "SPEEX";
   case AST_FORMAT_ILBC:
      return "ILBC";
   default:
      ast_log(LOG_NOTICE, "Don't know how to deal with mode %d\n", cap);
      return NULL;
   }
}

static int oh323_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, struct ast_rtp *trtp, int codecs, int nat_active)
{
   /* XXX Deal with Video */
   struct oh323_pvt *pvt;
   struct sockaddr_in them;
   struct sockaddr_in us;
   char *mode;

   if (!rtp) {
      return 0;
   }

   mode = convertcap(chan->writeformat);
   pvt = (struct oh323_pvt *) chan->tech_pvt;
   if (!pvt) {
      ast_log(LOG_ERROR, "No Private Structure, this is bad\n");
      return -1;
   }
   ast_rtp_get_peer(rtp, &them);
   ast_rtp_get_us(rtp, &us);
#if 0 /* Native bridge still isn't ready */
   h323_native_bridge(pvt->cd.call_token, ast_inet_ntoa(them.sin_addr), mode);
#endif
   return 0;
}

static struct ast_rtp_protocol oh323_rtp = {
   .type = "H323",
   .get_rtp_info = oh323_get_rtp_peer,
   .get_vrtp_info = oh323_get_vrtp_peer,
   .set_rtp_peer = oh323_set_rtp_peer,
};

static enum ast_module_load_result load_module(void)
{
   int res;

   h323debug = 0;
   sched = sched_context_create();
   if (!sched) {
      ast_log(LOG_WARNING, "Unable to create schedule context\n");
      return AST_MODULE_LOAD_FAILURE;
   }
   io = io_context_create();
   if (!io) {
      ast_log(LOG_WARNING, "Unable to create I/O context\n");
      return AST_MODULE_LOAD_FAILURE;
   }
   ast_cli_register(&cli_h323_reload);
   ASTOBJ_CONTAINER_INIT(&userl);
   ASTOBJ_CONTAINER_INIT(&peerl);
   ASTOBJ_CONTAINER_INIT(&aliasl);
   res = reload_config(0);
   if (res) {
      /* No config entry */
      ast_log(LOG_NOTICE, "Unload and load chan_h323.so again in order to receive configuration changes.\n");
      ast_cli_unregister(&cli_h323_reload);
      io_context_destroy(io);
      io = NULL;
      sched_context_destroy(sched);
      sched = NULL;
      ASTOBJ_CONTAINER_DESTROY(&userl);
      ASTOBJ_CONTAINER_DESTROY(&peerl);
      ASTOBJ_CONTAINER_DESTROY(&aliasl);
      return AST_MODULE_LOAD_DECLINE;
   } else {
      /* Make sure we can register our channel type */
      if (ast_channel_register(&oh323_tech)) {
         ast_log(LOG_ERROR, "Unable to register channel class 'H323'\n");
         ast_cli_unregister(&cli_h323_reload);
         h323_end_process();
         io_context_destroy(io);
         sched_context_destroy(sched);

         ASTOBJ_CONTAINER_DESTROYALL(&userl, oh323_destroy_user);
         ASTOBJ_CONTAINER_DESTROY(&userl);
         ASTOBJ_CONTAINER_DESTROYALL(&peerl, oh323_destroy_peer);
         ASTOBJ_CONTAINER_DESTROY(&peerl);
         ASTOBJ_CONTAINER_DESTROYALL(&aliasl, oh323_destroy_alias);
         ASTOBJ_CONTAINER_DESTROY(&aliasl);

         return AST_MODULE_LOAD_FAILURE;
      }
      ast_cli_register_multiple(cli_h323, sizeof(cli_h323) / sizeof(struct ast_cli_entry));

      ast_rtp_proto_register(&oh323_rtp);

      /* Register our callback functions */
      h323_callback_register(setup_incoming_call,
                  setup_outgoing_call,
                  external_rtp_create,
                  setup_rtp_connection,
                  cleanup_connection,
                  chan_ringing,
                  connection_made,
                  receive_digit,
                  answer_call,
                  progress,
                  set_dtmf_payload,
                  hangup_connection,
                  set_local_capabilities,
                  set_peer_capabilities,
                  remote_hold);
      /* start the h.323 listener */
      if (h323_start_listener(h323_signalling_port, bindaddr)) {
         ast_log(LOG_ERROR, "Unable to create H323 listener.\n");
         ast_rtp_proto_unregister(&oh323_rtp);
         ast_cli_unregister_multiple(cli_h323, sizeof(cli_h323) / sizeof(struct ast_cli_entry));
         ast_cli_unregister(&cli_h323_reload);
         h323_end_process();
         io_context_destroy(io);
         sched_context_destroy(sched);

         ASTOBJ_CONTAINER_DESTROYALL(&userl, oh323_destroy_user);
         ASTOBJ_CONTAINER_DESTROY(&userl);
         ASTOBJ_CONTAINER_DESTROYALL(&peerl, oh323_destroy_peer);
         ASTOBJ_CONTAINER_DESTROY(&peerl);
         ASTOBJ_CONTAINER_DESTROYALL(&aliasl, oh323_destroy_alias);
         ASTOBJ_CONTAINER_DESTROY(&aliasl);

         return AST_MODULE_LOAD_FAILURE;
      }
      /* Possibly register with a GK */
      if (!gatekeeper_disable) {
         if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
            ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
            gatekeeper_disable = 1;
            res = AST_MODULE_LOAD_SUCCESS;
         }
      }
      /* And start the monitor for the first time */
      restart_monitor();
   }
   return res;
}

static int unload_module(void)
{
   struct oh323_pvt *p, *pl;

   /* unregister commands */
   ast_cli_unregister_multiple(cli_h323, sizeof(cli_h323) / sizeof(struct ast_cli_entry));
   ast_cli_unregister(&cli_h323_reload);

   ast_channel_unregister(&oh323_tech);
   ast_rtp_proto_unregister(&oh323_rtp);

   if (!ast_mutex_lock(&iflock)) {
      /* hangup all interfaces if they have an owner */
      p = iflist;
      while(p) {
         if (p->owner) {
            ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
         }
         p = p->next;
      }
      iflist = NULL;
      ast_mutex_unlock(&iflock);
   } else {
      ast_log(LOG_WARNING, "Unable to lock the interface list\n");
      return -1;
   }
   if (!ast_mutex_lock(&monlock)) {
      if ((monitor_thread != AST_PTHREADT_STOP) && (monitor_thread != AST_PTHREADT_NULL)) {
         if (monitor_thread != pthread_self()) {
            pthread_cancel(monitor_thread);
         }
         pthread_kill(monitor_thread, SIGURG);
         pthread_join(monitor_thread, NULL);
      }
      monitor_thread = AST_PTHREADT_STOP;
      ast_mutex_unlock(&monlock);
   } else {
      ast_log(LOG_WARNING, "Unable to lock the monitor\n");
      return -1;
   }
   if (!ast_mutex_lock(&iflock)) {
      /* destroy all the interfaces and free their memory */
      p = iflist;
      while(p) {
         pl = p;
         p = p->next;
         /* free associated memory */
         ast_mutex_destroy(&pl->lock);
         ast_free(pl);
      }
      iflist = NULL;
      ast_mutex_unlock(&iflock);
   } else {
      ast_log(LOG_WARNING, "Unable to lock the interface list\n");
      return -1;
   }
   if (!gatekeeper_disable)
      h323_gk_urq();
   h323_end_process();
   if (io)
      io_context_destroy(io);
   if (sched)
      sched_context_destroy(sched);

   ASTOBJ_CONTAINER_DESTROYALL(&userl, oh323_destroy_user);
   ASTOBJ_CONTAINER_DESTROY(&userl);
   ASTOBJ_CONTAINER_DESTROYALL(&peerl, oh323_destroy_peer);
   ASTOBJ_CONTAINER_DESTROY(&peerl);
   ASTOBJ_CONTAINER_DESTROYALL(&aliasl, oh323_destroy_alias);
   ASTOBJ_CONTAINER_DESTROY(&aliasl);

   return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "The NuFone Network's OpenH323 Channel Driver",
      .load = load_module,
      .unload = unload_module,
      .reload = reload,
);