Disable automatic build of chan_h323

[asterisk-bristuff.git] / channels / chan_h323.c

/*
 * 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
 *
 * \ingroup channel_drivers
 */

/*** MODULEINFO
        <depend>openh323</depend>
        <defaultenabled>no</defaultenabled>
 ***/

#ifdef __cplusplus
extern "C" {
#endif

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#ifdef __cplusplus
}
#endif

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/param.h>
#if defined(BSD) || defined(SOLARIS)
#ifndef IPTOS_MINCOST
#define IPTOS_MINCOST 0x02
#endif
#endif
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <unistd.h>
#include <stdlib.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

#ifdef __cplusplus
extern "C" {
#endif

#include "asterisk/lock.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/musiconhold.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/lock.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

#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;

/* global debug flag */
int h323debug;

/*! 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_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 int tos = 0;
static char secret[50];
static unsigned int unique = 0;

static call_options_t global_options;

/** 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;                                            /* Payload code used for RFC2833 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;

static struct ast_user_list {
        ASTOBJ_CONTAINER_COMPONENTS(struct oh323_user);
} userl;

static struct ast_peer_list {
        ASTOBJ_CONTAINER_COMPONENTS(struct oh323_peer);
} peerl;

static struct ast_alias_list {
        ASTOBJ_CONTAINER_COMPONENTS(struct oh323_alias);
} aliasl;

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

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

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

/* 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);

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

/* 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 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_MAX_AUDIO << 1) - 1),
        .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,
        /* disable, for now */
#if 0
        .bridge = ast_rtp_bridge,
#endif
};

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_log(LOG_DEBUG, "Destroying alias '%s'\n", alias->name);
        free(alias);
}

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

static void oh323_destroy_peer(struct oh323_peer *peer)
{
        if (h323debug)
                ast_log(LOG_DEBUG, "Destroying peer '%s'\n", peer->name);
        ast_free_ha(peer->ha);
        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)) {
                        ast_mutex_unlock(&pvt->lock);
                        usleep(1);
                        ast_mutex_lock(&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;
}

/* 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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "Process pending hangup for %s\n", c->name);
                c->_softhangup |= AST_SOFTHANGUP_DEV;
                c->hangupcause = pvt->hangupcause;
                ast_queue_hangup(c);
                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);
                        c->fds[0] = ast_rtp_fd(pvt->rtp);
                        c->fds[1] = ast_rtcp_fd(pvt->rtp);
                        ast_queue_frame(pvt->owner, &ast_null_frame);   /* Tell Asterisk to apply changes */
                }
                pvt->update_rtp_info = -1;
        }
}

/* 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) {
                free(cd->call_token);
                cd->call_token = NULL;
        }
        if (cd->call_source_aliases) {
                free(cd->call_source_aliases);
                cd->call_source_aliases = NULL;
        }
        if (cd->call_dest_alias) {
                free(cd->call_dest_alias);
                cd->call_dest_alias = NULL;
        }
        if (cd->call_source_name) {
                free(cd->call_source_name);
                cd->call_source_name = NULL;
        }
        if (cd->call_source_e164) {
                free(cd->call_source_e164);
                cd->call_source_e164 = NULL;
        }
        if (cd->call_dest_e164) {
                free(cd->call_dest_e164);
                cd->call_dest_e164 = NULL;
        }
        if (cd->sourceIp) {
                free(cd->sourceIp);
                cd->sourceIp = NULL;
        }
        if (cd->redirect_number) {
                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_log(LOG_DEBUG, "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);
                free(pvt);
        }
}

static void oh323_destroy(struct oh323_pvt *pvt)
{
        if (h323debug) {
                ast_log(LOG_DEBUG, "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)) {
                /* 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 ? strdup(pvt->cd.call_token) : NULL;
                ast_mutex_unlock(&pvt->lock);
                h323_send_tone(token, digit);
                if (token) {
                        free(token);
                }
        } else
                ast_mutex_unlock(&pvt->lock);
        oh323_update_info(c);
        return 0;
}

/**
 * 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)) {
                /* 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 ? strdup(pvt->cd.call_token) : NULL;
                ast_mutex_unlock(&pvt->lock);
                h323_send_tone(token, ' ');
                if (token) {
                        free(token);
                }
        }
        oh323_update_info(c);
        return 0;
}

/**
 * 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_log(LOG_DEBUG, "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;

        if (option_verbose > 2)
                ast_verbose(VERBOSE_PREFIX_3 "Requested transfer capability: 0x%.2x - %s\n", c->transfercapability, ast_transfercapability2str(c->transfercapability));
        if (h323debug)
                ast_log(LOG_DEBUG, "Placing outgoing call to %s, %d\n", called_addr, pvt->options.dtmfcodec);
        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_log(LOG_DEBUG, "Answering on %s\n", c->name);

        ast_mutex_lock(&pvt->lock);
        token = pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL;
        ast_mutex_unlock(&pvt->lock);
        res = h323_answering_call(token, 0);
        if (token)
                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_log(LOG_DEBUG, "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 ? 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");
                        }
                        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;
}

static struct ast_frame *oh323_rtp_read(struct oh323_pvt *pvt)
{
        /* Retrieve audio/etc from channel. Assumes pvt->lock is already held. */
        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)) {
                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_log(LOG_DEBUG, "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 ? 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_log(LOG_DEBUG, "OH323: Indicating %d on %s\n", condition, token);

        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:
                ast_moh_start(c, data, NULL);
                res = 0;
                break;
        case AST_CONTROL_UNHOLD:
                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_log(LOG_DEBUG, "OH323: Indicated %d on %s, res=%d\n", condition, token, res);
        if (token)
                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_log(LOG_DEBUG, "Created RTP channel\n");

        ast_rtp_settos(pvt->rtp, tos);

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

        if (pvt->dtmf_pt > 0)
                ast_rtp_set_rtpmap_type(pvt->rtp, pvt->dtmf_pt, "audio", "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);
                pvt->owner->fds[0] = ast_rtp_fd(pvt->rtp);
                pvt->owner->fds[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;
}

/* 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 0
                ch->fds[0] = ast_rtp_fd(pvt->rtp);
                ch->fds[1] = ast_rtcp_fd(pvt->rtp);
#endif
#ifdef VIDEO_SUPPORT
                if (pvt->vrtp) {
                        ch->fds[2] = ast_rtp_fd(pvt->vrtp);
                        ch->fds[3] = ast_rtcp_fd(pvt->vrtp);
                }
#endif
#ifdef T38_SUPPORT
                if (pvt->udptl) {
                        ch->fds[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_DTMF_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 = 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 = (struct oh323_pvt *) malloc(sizeof(struct oh323_pvt));
        if (!pvt) {
                ast_log(LOG_ERROR, "Couldn't allocate private structure. This is bad\n");
                return NULL;
        }
        memset(pvt, 0, sizeof(struct oh323_pvt));
        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 = (char *)malloc(128);
                }
                if (!pvt->cd.call_token) {
                        ast_log(LOG_ERROR, "Not enough memory to alocate call token\n");
                        ast_rtp_destroy(pvt->rtp);
                        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) {
                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 = (struct oh323_alias *)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, NULL);

        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;
}

#define DEPRECATED(_v, _new_opt) \
        ast_log(LOG_WARNING, "Option %s found at line %d has beed deprecated. Use %s instead.\n", (_v)->name, (_v)->lineno, (_new_opt))

static int update_common_options(struct ast_variable *v, struct call_options *options)
{
        int tmp;

        if (!strcasecmp(v->name, "allow")) {
                ast_parse_allow_disallow(&options->prefs, &options->capability, v->value, 1);
        } else if (!strcasecmp(v->name, "disallow")) {
                ast_parse_allow_disallow(&options->prefs, &options->capability, v->value, 0);
        } else if (!strcasecmp(v->name, "dtmfmode")) {
                if (!strcasecmp(v->value, "inband")) {
                        options->dtmfmode = H323_DTMF_INBAND;
                } else if (!strcasecmp(v->value, "rfc2833")) {
                        options->dtmfmode = H323_DTMF_RFC2833;
                } else {
                        ast_log(LOG_WARNING, "Unknown dtmf mode '%s', using rfc2833\n", v->value);
                        options->dtmfmode = H323_DTMF_RFC2833;
                }
        } else if (!strcasecmp(v->name, "dtmfcodec")) {
                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 = 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, "noFastStart")) {
                DEPRECATED(v, "fastStart");
                options->fastStart = !ast_true(v->value);
        } else if (!strcasecmp(v->name, "fastStart")) {
                options->fastStart = ast_true(v->value);
        } else if (!strcasecmp(v->name, "noH245Tunneling")) {
                DEPRECATED(v, "h245Tunneling");
                options->h245Tunneling = !ast_true(v->value);
        } else if (!strcasecmp(v->name, "h245Tunneling")) {
                options->h245Tunneling = ast_true(v->value);
        } else if (!strcasecmp(v->name, "noSilenceSuppression")) {
                DEPRECATED(v, "silenceSuppression");
                options->silenceSuppression = !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
                return 1;

        return 0;
}
#undef DEPRECATED

static struct oh323_user *build_user(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 = (struct oh323_user *)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));
        /* 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")) {
                        user->ha = ast_append_ha(v->name, v->value, user->ha);
                }
        }
        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;
        char *username;

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

        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 = (struct oh323_peer*)calloc(1, sizeof(*peer))))
                        return NULL;
                ASTOBJ_INIT(peer);
        }
        oldha = peer->ha;
        peer->ha = NULL;
        memcpy(&peer->options, &global_options, sizeof(peer->options));
        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")) {
                        peer->ha = ast_append_ha(v->name, v->value, peer->ha);
                } 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));
                        }
                }
        }
        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;

        /* First check on peer name */
        if (peername)
                var = ast_load_realtime("h323", "name", peername, addr = NULL);
        else if (sin) /* Then check on IP address for dynamic peers */
                var = ast_load_realtime("h323", "host", addr = ast_inet_ntoa(sin->sin_addr), NULL);
        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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "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_MAX_AUDIO << 1) - 1);
        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_log(LOG_DEBUG, "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;
}

/** 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;
}

/**
  * 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;
}

/**
  * Callback function used to inform the H.323 stack of the local rtp ip/port details
  *
  * 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 = (struct rtp_info *)malloc(sizeof(struct rtp_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) {
                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);
                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_log(LOG_DEBUG, "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;
};

/**
  * 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_log(LOG_DEBUG, "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);

        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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "RTP connection preparation for %s is pending...\n", token);
                }
        }
        ast_mutex_unlock(&pvt->lock);

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

        return;
}

/**
  *     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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "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;
}

/**
 *  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_log(LOG_DEBUG, "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_verbose(VERBOSE_PREFIX_3 "Setting up Call\n");
                ast_verbose(VERBOSE_PREFIX_3 " \tCall token:  [%s]\n", pvt->cd.call_token);
                ast_verbose(VERBOSE_PREFIX_3 " \tCalling party name:  [%s]\n", pvt->cd.call_source_name);
                ast_verbose(VERBOSE_PREFIX_3 " \tCalling party number:  [%s]\n", pvt->cd.call_source_e164);
                ast_verbose(VERBOSE_PREFIX_3 " \tCalled party name:  [%s]\n", pvt->cd.call_dest_alias);
                ast_verbose(VERBOSE_PREFIX_3 " \tCalled party number:  [%s]\n", pvt->cd.call_dest_e164);
                if (pvt->cd.redirect_reason >= 0)
                        ast_verbose(VERBOSE_PREFIX_3 " \tRedirecting party number:  [%s] (reason %d)\n", pvt->cd.redirect_number, pvt->cd.redirect_reason);
                ast_verbose(VERBOSE_PREFIX_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_log(LOG_DEBUG, "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;
}

/**
 * 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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "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;
}

/**
 * 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;
}

/**
  *  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_log(LOG_DEBUG, "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;
}

/**
  * 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_log(LOG_DEBUG, "Cleaning connection to %s\n", call_token);

        while (1) {
                pvt = find_call_locked(call_reference, call_token);
                if (!pvt) {
                        if (h323debug)
                                ast_log(LOG_DEBUG, "No connection for %s\n", call_token);
                        return;
                }
                if (!pvt->owner || !ast_channel_trylock(pvt->owner))
                        break;
#if 1
#ifdef DEBUG_THREADS
                ast_log(LOG_NOTICE, "Avoiding H.323 destory deadlock on %s, locked at %ld/%d by %s (%s:%d)\n", call_token, pvt->owner->lock.thread[0], pvt->owner->lock.reentrancy, pvt->owner->lock.func[0], pvt->owner->lock.file[0], pvt->owner->lock.lineno[0]);
#else
                ast_log(LOG_NOTICE, "Avoiding H.323 destory deadlock on %s\n", call_token);
#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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "Hanging up connection to %s with cause %d\n", token, cause);
        }

        pvt = find_call_locked(call_reference, token);
        if (!pvt) {
                if (h323debug) {
                        ast_log(LOG_DEBUG, "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(pvt->owner);
                ast_channel_unlock(pvt->owner);
        }
        else {
                pvt->needhangup = 1;
                pvt->hangupcause = cause;
                if (h323debug)
                        ast_log(LOG_DEBUG, "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)
{
        struct oh323_pvt *pvt;

        if (h323debug)
                ast_log(LOG_DEBUG, "Setting DTMF payload to %d on %s\n", payload, token);

        pvt = find_call_locked(call_reference, token);
        if (!pvt) {
                return;
        }
        if (pvt->rtp) {
                ast_rtp_set_rtpmap_type(pvt->rtp, payload, "audio", "telephone-event", 0);
        }
        pvt->dtmf_pt = payload;
        ast_mutex_unlock(&pvt->lock);
        if (h323debug)
                ast_log(LOG_DEBUG, "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_log(LOG_DEBUG, "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_log(LOG_DEBUG, "prefs[%d]=%s:%d\n", i, (prefs->order[i] ? ast_getformatname(1 << (prefs->order[i]-1)) : "<none>"), prefs->framing[i]);
                        }
                }
                if (pvt->rtp)
                        ast_rtp_codec_setpref(pvt->rtp, &pvt->peer_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_log(LOG_DEBUG, "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)
                ast_log(LOG_DEBUG, "Capabilities for connection %s is set\n", token);
}

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) {
                        if (option_verbose > 0) {
                                ast_verbose(VERBOSE_PREFIX_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)
{
        pthread_attr_t attr;
        /* 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 {
                pthread_attr_init(&attr);
                pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
                /* Start a new monitor */
                if (ast_pthread_create_background(&monitor_thread, &attr, do_monitor, NULL) < 0) {
                        monitor_thread = AST_PTHREADT_NULL;
                        ast_mutex_unlock(&monlock);
                        ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
                        pthread_attr_destroy(&attr);
                        return -1;
                }
                pthread_attr_destroy(&attr);
        }
        ast_mutex_unlock(&monlock);
        return 0;
}

static int h323_do_trace(int fd, int argc, char *argv[])
{
        if (argc != 4) {
                return RESULT_SHOWUSAGE;
        }
        h323_debug(1, atoi(argv[3]));
        ast_cli(fd, "H.323 trace set to level %s\n", argv[2]);
        return RESULT_SUCCESS;
}

static int h323_no_trace(int fd, int argc, char *argv[])
{
        if (argc < 3 || argc > 4) {
                return RESULT_SHOWUSAGE;
        }
        h323_debug(0,0);
        ast_cli(fd, "H.323 trace disabled\n");
        return RESULT_SUCCESS;
}

static int h323_do_debug(int fd, int argc, char *argv[])
{
        if (argc < 2 || argc > 3) {
                return RESULT_SHOWUSAGE;
        }
        h323debug = 1;
        ast_cli(fd, "H.323 debug enabled\n");
        return RESULT_SUCCESS;
}

static int h323_no_debug(int fd, int argc, char *argv[])
{
        if (argc < 3 || argc > 4) {
                return RESULT_SHOWUSAGE;
        }
        h323debug = 0;
        ast_cli(fd, "H.323 debug disabled\n");
        return RESULT_SUCCESS;
}

static int h323_gk_cycle(int fd, int argc, char *argv[])
{
        if (argc != 3) {
                return RESULT_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 RESULT_SUCCESS;
}

static int h323_ep_hangup(int fd, int argc, char *argv[])
{
        if (argc != 3) {
                return RESULT_SHOWUSAGE;
        }
        if (h323_soft_hangup(argv[2])) {
                ast_verbose(VERBOSE_PREFIX_3 "Hangup succeeded on %s\n", argv[2]);
        } else {
                ast_verbose(VERBOSE_PREFIX_3 "Hangup failed for %s\n", argv[2]);
        }
        return RESULT_SUCCESS;
}

static int h323_tokens_show(int fd, int argc, char *argv[])
{
        if (argc != 3) {
                return RESULT_SHOWUSAGE;
        }
        h323_show_tokens();
        return RESULT_SUCCESS;
}

static char trace_usage[] =
"Usage: h.323 trace <level num>\n"
"       Enables H.323 stack tracing for debugging purposes\n";

static char no_trace_usage[] =
"Usage: h.323 trace off\n"
"       Disables H.323 stack tracing for debugging purposes\n";

static char debug_usage[] =
"Usage: h.323 debug\n"
"       Enables H.323 debug output\n";

static char no_debug_usage[] =
"Usage: h.323 debug off\n"
"       Disables H.323 debug output\n";

static char show_cycle_usage[] =
"Usage: h.323 gk cycle\n"
"       Manually re-register with the Gatekeper (Currently Disabled)\n";

static char show_hangup_usage[] =
"Usage: h.323 hangup <token>\n"
"       Manually try to hang up call identified by <token>\n";

static char show_tokens_usage[] =
"Usage: h.323 show tokens\n"
"       Print out all active call tokens\n";

static char h323_reload_usage[] =
"Usage: h323 reload\n"
"       Reloads H.323 configuration from h323.conf\n";

static struct ast_cli_entry cli_h323_no_trace_deprecated = {
        { "h.323", "no", "trace", NULL },
        h323_no_trace, "Disable H.323 Stack Tracing",
        no_trace_usage };

static struct ast_cli_entry cli_h323_no_debug_deprecated = {
        { "h.323", "no", "debug", NULL },
        h323_no_debug, "Disable H.323 debug",
        no_debug_usage };

static struct ast_cli_entry cli_h323_debug_deprecated = {
        { "h.323", "debug", NULL },
        h323_do_debug, "Enable H.323 debug",
        debug_usage };

static struct ast_cli_entry cli_h323_trace_deprecated = {
        { "h.323", "trace", NULL },
        h323_do_trace, "Enable H.323 Stack Tracing",
        trace_usage };

static struct ast_cli_entry cli_h323_gk_cycle_deprecated = {
        { "h.323", "gk", "cycle", NULL },
        h323_gk_cycle, "Manually re-register with the Gatekeper",
        show_cycle_usage };

static struct ast_cli_entry cli_h323[] = {
        { { "h323", "set", "trace", NULL },
        h323_do_trace, "Enable H.323 Stack Tracing",
        trace_usage, NULL, &cli_h323_trace_deprecated },

        { { "h323", "set", "trace", "off", NULL },
        h323_no_trace, "Disable H.323 Stack Tracing",
        no_trace_usage, NULL, &cli_h323_no_trace_deprecated },

        { { "h323", "set", "debug", NULL },
        h323_do_debug, "Enable H.323 debug",
        debug_usage, NULL, &cli_h323_debug_deprecated },

        { { "h323", "set", "debug", "off", NULL },
        h323_no_debug, "Disable H.323 debug",
        no_debug_usage, NULL, &cli_h323_no_debug_deprecated },

        { { "h323", "cycle", "gk", NULL },
        h323_gk_cycle, "Manually re-register with the Gatekeper",
        show_cycle_usage, NULL, &cli_h323_gk_cycle_deprecated },

        { { "h323", "hangup", NULL },
        h323_ep_hangup, "Manually try to hang up a call",
        show_hangup_usage },

        { { "h323", "show", "tokens", NULL },
        h323_tokens_show, "Show all active call tokens",
        show_tokens_usage },
};

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)
{
        int format;
        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;

        cfg = ast_config_load(config);

        /* 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;
        }

        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 = 101;
        global_options.dtmfmode = H323_DTMF_RFC2833;
        global_options.capability = GLOBAL_CAPABILITY;
        global_options.bridge = 1;              /* Do native bridging by default */
        strcpy(default_context, "default");
        h323_signalling_port = 1720;
        gatekeeper_disable = 1;
        gatekeeper_discover = 0;
        gkroute = 0;
        userbyalias = 1;
        acceptAnonymous = 1;
        tos = 0;

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

        /* Load configuration from users.conf */
        ucfg = ast_config_load("users.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")) {
                        if (sscanf(v->value, "%d", &format)) {
                                tos = format & 0xff;
                        } else if (!strcasecmp(v->value, "lowdelay")) {
                                tos = IPTOS_LOWDELAY;
                        } else if (!strcasecmp(v->value, "throughput")) {
                                tos = IPTOS_THROUGHPUT;
                        } else if (!strcasecmp(v->value, "reliability")) {
                                tos = IPTOS_RELIABILITY;
                        } else if (!strcasecmp(v->value, "mincost")) {
                                tos = IPTOS_MINCOST;
                        } else if (!strcasecmp(v->value, "none")) {
                                tos = 0;
                        } else {
                                ast_log(LOG_WARNING, "Invalid tos value at line %d, should be 'lowdelay', 'throughput', 'reliability', 'mincost', or 'none'\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_verbose(VERBOSE_PREFIX_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 */
                }
        }

        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(int fd, int argc, char *argv[])
{
        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 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(0, 0, NULL);
}

static struct ast_cli_entry cli_h323_reload =
        { { "h.323", "reload", NULL },
        h323_reload, "Reload H.323 configuration",
        h323_reload_usage
};

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_GET_FAILED;

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

        ast_mutex_lock(&pvt->lock);
        if (pvt->rtp && pvt->options.bridge) {
                *rtp = pvt->rtp;
                res = AST_RTP_TRY_NATIVE;
        }
        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, 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);
                /* 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)) {
                        /* this causes a seg, anyone know why? */
                        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);
                        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,
);