asterisk/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
 */

#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/param.h>
#if defined(BSD)
#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.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include "asterisk/lock.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.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"
#ifdef __cplusplus
}
#endif
#include "h323/chan_h323.h"

send_digit_cb on_send_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;

/* global debug flag */
int h323debug;

/** Variables required by Asterisk */
static const char type[] = "H323";
static const char desc[] = "The NuFone Network's Open H.323 Channel Driver";
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;

/** 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 usingGk = 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 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 cid_num[80];					/* Caller*id number, if available */
	char cid_name[80];					/* Caller*id name, if available */
	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 */
	struct oh323_pvt *next;				/* Next channel in list */
} *iflist = NULL;

static struct ast_user_list {
	struct oh323_user *users;
	ast_mutex_t lock;
} userl;

static struct ast_peer_list {
	struct oh323_peer *peers;
	ast_mutex_t lock;
} peerl;

static struct ast_alias_list {
	struct oh323_alias *aliases;
	ast_mutex_t lock;
} 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);

/** Usage counter and associated lock */
static int usecnt = 0;
AST_MUTEX_DEFINE_STATIC(usecnt_lock);

/* 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(struct ast_channel *c, char digit);
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);
static int oh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);

static const struct ast_channel_tech oh323_tech = {
	.type = type,
	.description = tdesc,
	.capabilities = AST_FORMAT_ULAW,
	.properties = AST_CHAN_TP_WANTSJITTER,
	.requester = oh323_request,
	.send_digit = oh323_digit,
	.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
};

/* 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 = -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;
	}
}

/* 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;
        }
}

static void __oh323_destroy(struct oh323_pvt *pvt)
{
	struct oh323_pvt *cur, *prev = NULL;
	
	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_mutex_lock(&pvt->owner->lock);
		ast_log(LOG_DEBUG, "Detaching from %s\n", pvt->owner->name);
		pvt->owner->tech_pvt = NULL;
		ast_mutex_unlock(&pvt->owner->lock);
	}
	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_destroy(&pvt->lock);
		free(pvt);
	}
}

static void oh323_destroy(struct oh323_pvt *pvt)
{
	ast_mutex_lock(&iflock);
	__oh323_destroy(pvt);
	ast_mutex_unlock(&iflock);
}

/**
 * Send (play) the specified digit to the channel.
 * 
 */
static int oh323_digit(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)) {
		/* out-of-band DTMF */
		if (h323debug) {
			ast_log(LOG_DEBUG, "Sending out-of-band digit %c on %s\n", digit, c->name);
		}
		ast_rtp_senddigit(pvt->rtp, digit);
	} else {
		/* in-band DTMF */
		if (h323debug) {
			ast_log(LOG_DEBUG, "Sending inband digit %c on %s\n", digit, c->name);
		}
		token = pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL;
		h323_send_tone(token, digit);
		if (token) {
			free(token);
		}
	}
	ast_mutex_unlock(&pvt->lock);
	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;
	char addr[INET_ADDRSTRLEN];
	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 (usingGk) {
		if (ast_strlen_zero(pvt->exten)) {
			strncpy(called_addr, dest, sizeof(called_addr));
		} else {
			snprintf(called_addr, sizeof(called_addr), "%s@%s", pvt->exten, dest);
		}
	} else {
		ast_inet_ntoa(addr, sizeof(addr), pvt->sa.sin_addr);
		res = htons(pvt->sa.sin_port);
		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) {
		strncpy(pvt->options.cid_num, c->cid.cid_num, sizeof(pvt->options.cid_num));
	}
	if (c->cid.cid_name) {
		strncpy(pvt->options.cid_name, c->cid.cid_name, sizeof(pvt->options.cid_name));
	}

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

	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 needcancel = 0;
	int q931cause = AST_CAUSE_NORMAL_CLEARING;
	char *call_token;


	if (h323debug)
		ast_log(LOG_DEBUG, "Hanging up call %s\n", c->name);

	if (!c->tech_pvt) {
		ast_log(LOG_DEBUG, "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;
	}
	if (!c || (c->_state != AST_STATE_UP)) {
		needcancel = 1;
	}
	
	pvt->owner = NULL;
	c->tech_pvt = NULL;

	if (c->hangupcause) {
		q931cause = c->hangupcause;
	} else {
		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_DEBUG, "ClearCall failed.\n");
			}
			free(call_token);
			ast_mutex_lock(&pvt->lock);
		}
	} 
	pvt->needdestroy = 1;

	/* Update usage counter */
	ast_mutex_lock(&usecnt_lock);
	usecnt--;
	if (usecnt < 0) {
		ast_log(LOG_WARNING, "Usecnt < 0\n");
	}
	ast_mutex_unlock(&usecnt_lock);
	ast_mutex_unlock(&pvt->lock);
	ast_update_use_count();
	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;
	static struct ast_frame null_frame = { AST_FRAME_NULL, };

	/* 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 &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_mutex_trylock(&pvt->owner->lock)) {
					ast_log(LOG_NOTICE, "Format changed but channel is locked. Ignoring frame...\n");
					return &null_frame;
				}
				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_mutex_unlock(&pvt->owner->lock);
			}	
			/* Do in-band DTMF detection */
			if ((pvt->options.dtmfmode & H323_DTMF_INBAND) && pvt->vad) {
				if (!ast_mutex_trylock(&pvt->owner->lock)) {
					f = ast_dsp_process(pvt->owner,pvt->vad,f);
					ast_mutex_unlock(&pvt->owner->lock);
				}
				else
					ast_log(LOG_NOTICE, "Unable to process inband DTMF while channel is locked\n");
				if (f &&(f->frametype == AST_FRAME_DTMF)) {
					ast_log(LOG_DEBUG, "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);
	fr = oh323_rtp_read(pvt);
	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) {
			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)
{

	struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
	char *token = (char *)NULL;

	ast_mutex_lock(&pvt->lock);
	token = (pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL);
	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);
 			break;
 		}
 		if (token)
 			free(token);
		return -1;
	case AST_CONTROL_PROGRESS:
		if (c->_state != AST_STATE_UP) {
			h323_send_progress(token);
			break;
		}
		if (token)
			free(token);
		return -1;

	case AST_CONTROL_BUSY:
		if (c->_state != AST_STATE_UP) {
			h323_answering_call(token, 1);
			ast_mutex_lock(&pvt->lock);
			pvt->alreadygone = 1;
			ast_mutex_unlock(&pvt->lock);
			ast_softhangup_nolock(c, AST_SOFTHANGUP_DEV);			
			break;
		}
		if (token)
			free(token);
		return -1;
	case AST_CONTROL_CONGESTION:
		if (c->_state != AST_STATE_UP) {
			h323_answering_call(token, 1);
			ast_mutex_lock(&pvt->lock);
			pvt->alreadygone = 1;
			ast_mutex_unlock(&pvt->lock);
			ast_softhangup_nolock(c, AST_SOFTHANGUP_DEV);
			break;
		}
		if (token)
			free(token);
		return -1;
	case AST_CONTROL_PROCEEDING:
	case -1:
		if (token)
			free(token);
		return -1;
	default:
		ast_log(LOG_WARNING, "Don't know how to indicate condition %d on %s\n", condition, token);
		if (token)
			free(token);
		return -1;
	}

	if (h323debug)
		ast_log(LOG_DEBUG, "OH323: Indicated %d on %s\n", condition, token);
	if (token)
		free(token);
	oh323_update_info(c);

	return -1;
}

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;
}

/* 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;
	int fmt;
	
	/* Don't hold a oh323_pvt lock while we allocate a chanel */
	ast_mutex_unlock(&pvt->lock);
	ch = ast_channel_alloc(1);
	/* Update usage counter */
	ast_mutex_lock(&usecnt_lock);
	usecnt++;
	ast_mutex_unlock(&usecnt_lock);
	ast_update_use_count();
	ast_mutex_lock(&pvt->lock);
	if (ch) {
		ch->tech = &oh323_tech;
		snprintf(ch->name, sizeof(ch->name), "H323/%s", host);
		ch->nativeformats = pvt->options.capability;
		if (!ch->nativeformats) {
			ch->nativeformats = global_options.capability;
		}
		pvt->nativeformats = ch->nativeformats;
		fmt = ast_best_codec(ch->nativeformats);
		ch->type = type;
		ch->fds[0] = ast_rtp_fd(pvt->rtp);
		if (state == AST_STATE_RING) {
			ch->rings = 1;
		}
		ch->writeformat = fmt;
		ch->rawwriteformat = fmt;
		ch->readformat = fmt;
		ch->rawreadformat = fmt;
		/* 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;
		
		strncpy(ch->context, pvt->context, sizeof(ch->context) - 1);
		strncpy(ch->exten, pvt->exten, sizeof(ch->exten) - 1);		
		ch->priority = 1;
		if (!ast_strlen_zero(pvt->accountcode)) {
			strncpy(ch->accountcode, pvt->accountcode, sizeof(ch->accountcode) - 1);
		}
		if (pvt->amaflags) {
			ch->amaflags = pvt->amaflags;
		}
		if (!ast_strlen_zero(pvt->cid_num)) {
			ch->cid.cid_num = strdup(pvt->cid_num);
		} else if (!ast_strlen_zero(pvt->cd.call_source_e164)) {
			ch->cid.cid_num = strdup(pvt->cd.call_source_e164);
		}
		if (!ast_strlen_zero(pvt->cid_name)) {
			ch->cid.cid_name = strdup(pvt->cid_name);
		} else if (!ast_strlen_zero(pvt->cd.call_source_name)) {
			ch->cid.cid_name = strdup(pvt->cd.call_source_name);
		}
		if (!ast_strlen_zero(pvt->rdnis)) {
			ch->cid.cid_rdnis = strdup(pvt->rdnis);
		}
		if (!ast_strlen_zero(pvt->exten) && strcmp(pvt->exten, "s")) {
			ch->cid.cid_dnid = strdup(pvt->exten);
		}
		ast_setstate(ch, state);
		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->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0,bindaddr.sin_addr);
	if (!pvt->rtp) {
		ast_log(LOG_WARNING, "Unable to create RTP session: %s\n", strerror(errno));
		free(pvt);
		return NULL;
	}
	ast_rtp_settos(pvt->rtp, tos);
	ast_mutex_init(&pvt->lock);
	/* Ensure the call token is allocated */
	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");
		return NULL;
	}
	memset((char *)(pvt->cd).call_token, 0, 128);
	pvt->cd.call_reference = callid;
	memcpy(&pvt->options, &global_options, sizeof(pvt->options));
	if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
		pvt->nonCodecCapability |= AST_RTP_DTMF;
	} else {
		pvt->nonCodecCapability &= ~AST_RTP_DTMF;
	}
	strncpy(pvt->context, default_context, sizeof(pvt->context) - 1);
	pvt->newstate = pvt->newcontrol = -1;
	/* 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) && (!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_mutex_trylock(&pvt->owner->lock)) {
		if (state >= 0)
			ast_setstate(pvt->owner, state);
		if (signal >= 0)
			ast_queue_control(pvt->owner, signal);
		return 1;
	}
	else {
		if (state >= 0)
			pvt->newstate = state;
		if (signal >= 0)
			pvt->newcontrol = signal;
		return 0;
	}
}

struct oh323_user *find_user(const call_details_t *cd)
{
	struct oh323_user *u;
	char iabuf[INET_ADDRSTRLEN];
	u = userl.users;
	if (userbyalias) {
		while(u) {
			if (!strcasecmp(u->name, cd->call_source_aliases)) {
				break;
			}
			u = u->next;
		}
	} else {
		while(u) {
			if (!strcasecmp(cd->sourceIp, ast_inet_ntoa(iabuf, sizeof(iabuf), u->addr.sin_addr))) {
				break;
			}
			u = u->next;
		}
	}
	return u;
}

struct oh323_peer *find_peer(const char *peer, struct sockaddr_in *sin)
{
	struct oh323_peer *p = NULL;
       	static char iabuf[INET_ADDRSTRLEN];

	p = peerl.peers;
	if (peer) {
		while(p) {
			if (!strcasecmp(p->name, peer)) {
				ast_log(LOG_DEBUG, "Found peer %s by name\n", peer);
				break;
			}
			p = p->next;
		}
	} else {
		/* find by sin */
		if (sin) {
			while (p) {
				if ((!inaddrcmp(&p->addr, sin)) || 
					(p->addr.sin_addr.s_addr == sin->sin_addr.s_addr)) {
					ast_log(LOG_DEBUG, "Found peer %s/%s by addr\n", peer, ast_inet_ntoa(iabuf, sizeof(iabuf), p->addr.sin_addr));
					break;
				}
				p = p->next;
			}
		}	
	}
	if (!p) {
		ast_log(LOG_DEBUG, "Could not find peer %s by name or address\n", peer);
	}
	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] = "";

	strncpy(peer, opeer, sizeof(peer) - 1);
	port = strchr(peer, ':');
	if (port) {
		*port = '\0';
		port++;
	}
	pvt->sa.sin_family = AF_INET;
	ast_mutex_lock(&peerl.lock);
	p = find_peer(peer, NULL);
	if (p) {
		found++;
		memcpy(&pvt->options, &p->options, sizeof(pvt->options));
		if (pvt->rtp) {
			ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", pvt->options.nat);
			ast_rtp_setnat(pvt->rtp, pvt->options.nat);
		}
		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;	
		} 
	}
	ast_mutex_unlock(&peerl.lock);
	if (!p && !found) {
		hostn = peer;
		if (port) {
			portno = atoi(port);
		} else {
			portno = h323_signalling_port;
		}		
		hp = ast_gethostbyname(hostn, &ahp);
		if (hp) {
			memcpy(&pvt->options, &global_options, sizeof(pvt->options));
			memcpy(&pvt->sa.sin_addr, hp->h_addr, sizeof(pvt->sa.sin_addr));
			pvt->sa.sin_port = htons(portno);
			return 0;	
		} else {
			ast_log(LOG_WARNING, "No such host: %s\n", peer);
			return -1;
		}
	} else if (!p) {
		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];
	
	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);
		return NULL;
	}
	strncpy(tmp, dest, sizeof(tmp) - 1);	
	host = strchr(tmp, '@');
	if (host) {
		*host = '\0';
		host++;
		ext = tmp;
	} else {
		host = tmp;
		ext = NULL;
	}
	strtok_r(host, "/", &(h323id));		
	if (!ast_strlen_zero(h323id)) {
		h323_set_id(h323id);
	}
	if (ext) {
		strncpy(pvt->exten, ext, sizeof(pvt->exten) - 1);
	}
	ast_log(LOG_DEBUG, "Extension: %s Host: %s\n",  pvt->exten, host);
	if (!usingGk) {
		if (create_addr(pvt, host)) {
			oh323_destroy(pvt);
			return NULL;
		}
	}
	else {
		memcpy(&pvt->options, &global_options, sizeof(pvt->options));
		if (pvt->rtp) {
			ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", pvt->options.nat);
			ast_rtp_setnat(pvt->rtp, pvt->options.nat);
		}
		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);
	}
	ast_update_use_count();
	restart_monitor();
	return tmpc;
}

/** Find a call by alias */
struct oh323_alias *find_alias(const char *source_aliases)
{
	struct oh323_alias *a;

	a = aliasl.aliases;
	while(a) {
		if (!strcasecmp(a->name, source_aliases)) {
			break;
		}
		a = a->next;
	}
	return a;
}

/**
  * Callback for sending digits from H.323 up to asterisk
  *
  */
int send_digit(unsigned call_reference, char digit, const char *token)
{
	struct oh323_pvt *pvt;
	struct ast_frame f;
	int res;

	ast_log(LOG_DEBUG, "Received Digit: %c\n", digit);
	pvt = find_call_locked(call_reference, token); 
	if (!pvt) {
		ast_log(LOG_ERROR, "Private structure not found in send_digit.\n");
		return -1;
	}
	memset(&f, 0, sizeof(f));
	f.frametype = AST_FRAME_DTMF;
	f.subclass = digit;
	f.datalen = 0;
	f.samples = 800;
	f.offset = 0;
	f.data = NULL;
	f.mallocd = 0;
	f.src = "SEND_DIGIT";	
	res = ast_queue_frame(pvt->owner, &f);
	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
  */
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;
	}
	/* 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_inet_ntoa(info->addr, sizeof(info->addr), us.sin_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 
  */
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;

	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;
	}
	rtptype = ast_rtp_lookup_pt(pvt->rtp, pt);
	pvt->nativeformats = rtptype.code;
	if (pvt->owner && !ast_mutex_trylock(&pvt->owner->lock)) {
		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);
		ast_mutex_unlock(&pvt->owner->lock);
	}
	else {
		if (pvt->options.progress_audio)
			pvt->newcontrol = AST_CONTROL_PROGRESS;
		if (h323debug)
			ast_log(LOG_DEBUG, "RTP connection preparation for %s is pending...\n", token);
	}

	them.sin_family = AF_INET;
	/* only works for IPv4 */
	them.sin_addr.s_addr = inet_addr(remoteIp); 
	them.sin_port = htons(remotePort);
	ast_rtp_set_peer(pvt->rtp, &them);

	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
  */
void connection_made(unsigned call_reference, const char *token)
{
	struct ast_channel *c = NULL;
	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;
	}
	if (update_state(pvt, AST_STATE_UP, AST_CONTROL_ANSWER))
		ast_mutex_unlock(&pvt->owner->lock);
	ast_mutex_unlock(&pvt->lock);
	return;
}

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

	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;
	}
	if (update_state(pvt, -1, (inband ? AST_CONTROL_PROGRESS : AST_CONTROL_RINGING)))
		ast_mutex_unlock(&pvt->owner->lock);
	ast_mutex_unlock(&pvt->lock);

	return 0;
}

/**
 *  Call-back function for incoming calls
 *
 *  Returns 1 on success
 */
call_options_t *setup_incoming_call(call_details_t *cd)
{
	struct oh323_pvt *pvt;
	struct oh323_user *user = NULL;
	struct oh323_alias *alias = NULL;
	char iabuf[INET_ADDRSTRLEN];

	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");
		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));

	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);
	}

	/* Decide if we are allowing Gatekeeper routed calls*/
	if ((!strcasecmp(cd->sourceIp, gatekeeper)) && (gkroute == -1) && (usingGk)) {
		if (!ast_strlen_zero(cd->call_dest_e164)) {
			strncpy(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten) - 1);
			strncpy(pvt->context, default_context, sizeof(pvt->context) - 1); 
		} else {
			alias = find_alias(cd->call_dest_alias);
			if (!alias) {
				ast_log(LOG_ERROR, "Call for %s rejected, alias not found\n", cd->call_dest_alias);
				return NULL;
			}
			strncpy(pvt->exten, alias->name, sizeof(pvt->exten) - 1);
			strncpy(pvt->context, alias->context, sizeof(pvt->context) - 1);
		}
	} else {
		/* Either this call is not from the Gatekeeper 
		   or we are not allowing gk routed calls */
		user  = find_user(cd);
		if (!user) {
			if (!ast_strlen_zero(pvt->cd.call_dest_e164)) {
				strncpy(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten) - 1);
			} else {
				strncpy(pvt->exten, cd->call_dest_alias, sizeof(pvt->exten) - 1);
			}
			if (ast_strlen_zero(default_context)) {
				ast_log(LOG_ERROR, "Call from '%s' rejected due to no default context\n", pvt->cd.call_source_aliases);
				return NULL;
			}
			strncpy(pvt->context, default_context, sizeof(pvt->context) - 1);
			ast_log(LOG_DEBUG, "Sending %s to context [%s]\n", cd->call_source_aliases, pvt->context);
			/* XXX: Is it really required??? */
#if 0
			memset(&pvt->options, 0, sizeof(pvt->options));
#endif
		} else {
			if (user->host) {
				if (strcasecmp(cd->sourceIp, ast_inet_ntoa(iabuf, sizeof(iabuf), 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);
                					return NULL;
						}
						strncpy(pvt->context, default_context, sizeof(pvt->context) - 1);
					} else {
						strncpy(pvt->context, user->context, sizeof(pvt->context) - 1);
					}
					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);
					return NULL;	/* XXX: Hmmm... Why to setup context if we drop connection immediately??? */
				}
			}
			strncpy(pvt->context, user->context, sizeof(pvt->context) - 1);
			memcpy(&pvt->options, &user->options, sizeof(pvt->options));
			if (!ast_strlen_zero(pvt->cd.call_dest_e164)) {
				strncpy(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten) - 1);
			} else {
				strncpy(pvt->exten, cd->call_dest_alias, sizeof(pvt->exten) - 1);
			}
			if (!ast_strlen_zero(user->accountcode)) {
				strncpy(pvt->accountcode, user->accountcode, sizeof(pvt->accountcode) - 1);
			} 
			if (user->amaflags) {
				pvt->amaflags = user->amaflags;
			} 
		} 
	}
	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;

	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;
	}
	/* 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 
 */
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
  */
void chan_ringing(unsigned call_reference, const char *token)
{
	struct ast_channel *c = NULL;
	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;
	}
	if (update_state(pvt, AST_STATE_RINGING, AST_CONTROL_RINGING))
		ast_mutex_unlock(&pvt->owner->lock);
	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;

	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_mutex_trylock(&pvt->owner->lock))
			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, pvt->owner->lock.reentrancy, pvt->owner->lock.func, pvt->owner->lock.file, pvt->owner->lock.lineno);
#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_mutex_unlock(&pvt->owner->lock);
	}
	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;

	ast_log(LOG_DEBUG, "Hanging up connection to %s with cause %d\n", token, cause);
	
	pvt = find_call_locked(call_reference, token); 
	if (!pvt) {
		return;
	}
	if (pvt->owner && !ast_mutex_trylock(&pvt->owner->lock)) {
		pvt->owner->_softhangup |= AST_SOFTHANGUP_DEV;
		pvt->owner->hangupcause = pvt->hangupcause = cause;
		ast_queue_hangup(pvt->owner);
		ast_mutex_unlock(&pvt->owner->lock);
	}
	else {
		pvt->needhangup = 1;
		pvt->hangupcause = cause;
		ast_log(LOG_DEBUG, "Hangup for %s is pending\n", token);
	}
	ast_mutex_unlock(&pvt->lock);
}

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");
	}
	ast_mutex_unlock(&pvt->lock);
	if (h323debug)
		ast_log(LOG_DEBUG, "DTMF payload on %s set to %d\n", token, payload);
}

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

	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->options.capability;
	dtmfmode = pvt->options.dtmfmode;
	ast_mutex_unlock(&pvt->lock);
	h323_set_capabilities(token, capability, dtmfmode);

	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 */
		ast_mutex_lock(&iflock);
restartsearch:		
		oh323 = iflist;
		while(oh323) {
			if (oh323->needdestroy) {
				__oh323_destroy(oh323);
				goto restartsearch;
			}
			oh323 = oh323->next;
		}
		ast_mutex_unlock(&iflock);
		pthread_testcancel();
		/* Wait for sched or io */
		res = ast_sched_wait(sched);
		if ((res < 0) || (res > 1000)) {
			res = 1000;
		}
		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 (monitor_thread == AST_PTHREADT_STOP) {
		return 0;
	}
	if (ast_mutex_lock(&monlock)) {
		ast_log(LOG_WARNING, "Unable to lock monitor\n");
		return -1;
	}
	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(&monitor_thread, &attr, do_monitor, NULL) < 0) {
                        ast_mutex_unlock(&monlock);
                        ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
                        return -1;
                }

	}
	ast_mutex_unlock(&monlock);
	return 0;
}

static int h323_do_trace(int fd, int argc, char *argv[])
{
	if (argc != 3) {
		return RESULT_SHOWUSAGE;
	}
	h323_debug(1, atoi(argv[2]));
	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) {
		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) {
		return RESULT_SHOWUSAGE;
	}
	h323debug = 1;
	ast_cli(fd, "H323 debug enabled\n");
	return RESULT_SUCCESS;
}

static int h323_no_debug(int fd, int argc, char *argv[])
{
	if (argc != 3) {
		return RESULT_SHOWUSAGE;
	}
	h323debug = 0;
	ast_cli(fd, "H323 Debug disabled\n");
	return RESULT_SUCCESS;
}

static int h323_gk_cycle(int fd, int argc, char *argv[])
{
#if 0
	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");
		}
	}
#endif
	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 no trace\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 no debug\n"
"       Disables H.323 debug output\n";

static char show_codec_usage[] = 
"Usage: h.323 show codec\n"
"       Shows all enabled codecs\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 sip.conf\n";

static struct ast_cli_entry  cli_trace =
	{ { "h.323", "trace", NULL }, h323_do_trace, "Enable H.323 Stack Tracing", trace_usage };
static struct ast_cli_entry  cli_no_trace =
	{ { "h.323", "no", "trace", NULL }, h323_no_trace, "Disable H.323 Stack Tracing", no_trace_usage };
static struct ast_cli_entry  cli_debug =
	{ { "h.323", "debug", NULL }, h323_do_debug, "Enable H.323 debug", debug_usage };
static struct ast_cli_entry  cli_no_debug =
	{ { "h.323", "no", "debug", NULL }, h323_no_debug, "Disable H.323 debug", no_debug_usage };
static struct ast_cli_entry  cli_show_codecs =
	{ { "h.323", "show", "codecs", NULL }, h323_show_codec, "Show enabled codecs", show_codec_usage };
static struct ast_cli_entry  cli_gk_cycle =
	{ { "h.323", "gk", "cycle", NULL }, h323_gk_cycle, "Manually re-register with the Gatekeper", show_cycle_usage };
static struct ast_cli_entry  cli_hangup_call =
	{ { "h.323", "hangup", NULL }, h323_ep_hangup, "Manually try to hang up a call", show_hangup_usage };
static struct ast_cli_entry  cli_show_tokens =
	{ { "h.323", "show", "tokens", NULL }, h323_tokens_show, "Show all active call tokens", show_tokens_usage };

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

	if (!strcasecmp(v->name, "allow")) {
		format = ast_getformatbyname(v->value);
		if (format < 1) 
			ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value);
		else
			options->capability |= format;
	} else if (!strcasecmp(v->name, "disallow")) {
		format = ast_getformatbyname(v->value);
		if (format < 1) 
			ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value);
		else
			options->capability &= ~format;
	} 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 global dtmfcodec value %s\n", v->value);
		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")) {
		options->noFastStart = ast_true(v->value);
	} else if (!strcasecmp(v->name, "noH245Tunneling")) {
		options->noH245Tunneling = ast_true(v->value);
	} else if (!strcasecmp(v->name, "noSilenceSuppression")) {
		options->noSilenceSuppression = 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 %d for progress_setup at line %d, assuming 0\n", tmp, v->lineno);
			tmp = 0;
		}
		options->progress_setup = tmp;
	} else if (!strcasecmp(v->name, "progress_alert")) {
		tmp = atoi(v->value);
		if ((tmp != 0) && (tmp != 8)) {
			ast_log(LOG_WARNING, "Invalud value %d for progress_alert at line %d, assuming 0\n", tmp, v->lineno);
			tmp = 0;
		}
		options->progress_alert = tmp;
	} else if (!strcasecmp(v->name, "progress_audio")) {
		options->progress_audio = ast_true(v->value);
	} else
		return 1;

	return 0;
}

static struct oh323_alias *build_alias(char *name, struct ast_variable *v)
{
	struct oh323_alias *alias;

	alias = (struct oh323_alias *)malloc(sizeof(struct oh323_alias));
	if (alias) {
		memset(alias, 0, sizeof(struct oh323_alias));
		strncpy(alias->name, name, sizeof(alias->name) - 1);
		while (v) {
			if (!strcasecmp(v->name, "e164")) {
				strncpy(alias->e164,  v->value, sizeof(alias->e164) - 1);
			} else if (!strcasecmp(v->name, "prefix")) {
				strncpy(alias->prefix,  v->value, sizeof(alias->prefix) - 1);
			} else if (!strcasecmp(v->name, "context")) {
				strncpy(alias->context,  v->value, sizeof(alias->context) - 1);
			} else if (!strcasecmp(v->name, "secret")) {
				strncpy(alias->secret,  v->value, sizeof(alias->secret) - 1);
			} else {
				if (strcasecmp(v->value, "h323")) { 	
					ast_log(LOG_WARNING, "Keyword %s does not make sense in type=h323\n", v->value);
				}
			}
			v = v->next;
		}
	}
	return alias;
}

static struct oh323_user *build_user(char *name, struct ast_variable *v)
{
	struct oh323_user *user;
	int format;

	user = (struct oh323_user *)malloc(sizeof(struct oh323_user));
	if (user) {
		memset(user, 0, sizeof(struct oh323_user));
		strncpy(user->name, name, sizeof(user->name) - 1);
		memcpy(&user->options, &global_options, sizeof(user->options));
		/* Set default context */
		strncpy(user->context, default_context, sizeof(user->context) - 1);
		while(v) {
			if (!strcasecmp(v->name, "context")) {
				strncpy(user->context, v->value, sizeof(user->context) - 1);
			} else if (!update_common_options(v, &user->options)) {
				/* dummy */
			} else if (!strcasecmp(v->name, "secret")) {
				strncpy(user->secret, v->value, sizeof(user->secret) - 1);
			} else if (!strcasecmp(v->name, "callerid")) {
				strncpy(user->callerid, v->value, sizeof(user->callerid) - 1);
			} else if (!strcasecmp(v->name, "accountcode")) {
				strncpy(user->accountcode, v->value, sizeof(user->accountcode) - 1);
			} 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");
					free(user);
					return NULL;
				} else if (ast_get_ip(&user->addr, v->value)) {
					free(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;
				}
			}
			v = v->next;
		}
	}
	return user;
}

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

	prev = NULL;
	ast_mutex_lock(&peerl.lock);
	peer = peerl.peers;

	while(peer) {
		if (!strcasecmp(peer->name, name)) {	
			break;
		}
		prev = peer;
		peer = peer->next;
	}

	if (peer) {
		found++;
		/* Already in the list, remove it and it will be added back (or FREE'd) */
		if (prev) {
			prev->next = peer->next;
		} else {
			peerl.peers = peer->next;
		}
		ast_mutex_unlock(&peerl.lock);
	} else {
		ast_mutex_unlock(&peerl.lock);
		peer = (struct oh323_peer*)malloc(sizeof(struct oh323_peer));
		if (peer)
			memset(peer, 0, sizeof(struct oh323_peer));
	}
	if (peer) {
		if (!found) {
			strncpy(peer->name, name, sizeof(peer->name) - 1);
			peer->addr.sin_port = htons(h323_signalling_port);
			peer->addr.sin_family = AF_INET;
		}
		oldha = peer->ha;
		peer->ha = NULL;
		peer->addr.sin_family = AF_INET;
		memcpy(&peer->options, &global_options, sizeof(peer->options));

		while(v) {
			if (!update_common_options(v, &peer->options)) {
				/* dummy */
			} else if (!strcasecmp(v->name, "host")) {
				if (!strcasecmp(v->value, "dynamic")) {
					ast_log(LOG_ERROR, "Dynamic host configuration not implemented.\n");
					free(peer);
					return NULL;
				}
				if (ast_get_ip(&peer->addr, v->value)) {
						ast_log(LOG_ERROR, "Could not determine IP for %s\n", v->value);
						free(peer);
						return NULL;
				}
			} else if (!strcasecmp(v->name, "port")) {
				peer->addr.sin_port = htons(atoi(v->value));
			}
			v=v->next;
		}
	}
	return peer;
}

int reload_config(void)
{	
	int format;
	struct ast_config *cfg;
	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;
    	char *utype;
	
	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;
	}
	
       /* fire up the H.323 Endpoint */       
	if (!h323_end_point_exist()) {
	       h323_end_point_create();        
	}
	h323debug = 0;
	memset(&bindaddr, 0, sizeof(bindaddr));
	memset(&global_options, 0, sizeof(global_options));
	global_options.dtmfcodec = 101;
	global_options.dtmfmode = H323_DTMF_RFC2833;
	global_options.capability = ~0;	/* All capabilities */
	global_options.bridge = 1;		/* Do native bridging by default */
	v = ast_variable_browse(cfg, "general");
	while(v) {
		/* 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;
				usingGk = 0;
			} else if (!strcasecmp(v->value, "DISCOVER")) {
				gatekeeper_disable = 0;
				gatekeeper_discover = 1;
				usingGk = 1;
			} else {
				gatekeeper_disable = 0;
				usingGk = 1;
				strncpy(gatekeeper, v->value, sizeof(gatekeeper) - 1);
			}
		} else if (!strcasecmp(v->name, "secret")) {
			strncpy(secret, v->value, sizeof(secret) - 1);
		} else if (!strcasecmp(v->name, "AllowGKRouted")) {
			gkroute = ast_true(v->value);
		} else if (!strcasecmp(v->name, "context")) {
			strncpy(default_context, v->value, sizeof(default_context) - 1);
			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 (!update_common_options(v, &global_options)) {
			/* dummy */
		}
		v = v->next;	
	}
	
	cat = ast_category_browse(cfg, NULL);
	while(cat) {
		if (strcasecmp(cat, "general")) {
			utype = ast_variable_retrieve(cfg, cat, "type");
			if (utype) {
				if (!strcasecmp(utype, "user")) {
					user = build_user(cat, ast_variable_browse(cfg, cat));
					if (user) {
						ast_mutex_lock(&userl.lock);
						user->next = userl.users;
						userl.users = user;
						ast_mutex_unlock(&userl.lock);
					}
				}  else if (!strcasecmp(utype, "peer")) {
					peer = build_peer(cat, ast_variable_browse(cfg, cat));
					if (peer) {
						ast_mutex_lock(&peerl.lock);
						peer->next = peerl.peers;
						peerl.peers = peer;
						ast_mutex_unlock(&peerl.lock);
					}
				}  else if (!strcasecmp(utype, "friend")) {
					user = build_user(cat, ast_variable_browse(cfg, cat));
					peer = build_peer(cat, ast_variable_browse(cfg, cat));
					if (user) {
						ast_mutex_lock(&userl.lock);
						user->next = userl.users;
						userl.users = user;
						ast_mutex_unlock(&userl.lock);
					}
					if (peer) {
						ast_mutex_lock(&peerl.lock);
						peer->next = peerl.peers;
						peerl.peers = peer;
						ast_mutex_unlock(&peerl.lock);
					}
				}  else if (!strcasecmp(utype, "h323") || !strcasecmp(utype, "alias")) {
					alias = build_alias(cat, ast_variable_browse(cfg, cat));
					if (alias) {
						ast_mutex_lock(&aliasl.lock);
						alias->next = aliasl.aliases;
						aliasl.aliases = alias;
						ast_mutex_unlock(&aliasl.lock);
					}
				} else {
					ast_log(LOG_WARNING, "Unknown type '%s' for '%s' in %s\n", utype, cat, config);
				}
			} else {
				ast_log(LOG_WARNING, "Section '%s' lacks type\n", cat);
			}
		}
		cat = ast_category_browse(cfg, cat);
	}
	ast_config_destroy(cfg);

	/* Register our H.323 aliases if any*/
	while (alias) {		
		if (h323_set_alias(alias)) {
			ast_log(LOG_ERROR, "Alias %s rejected by endpoint\n", alias->name);
			return -1;
		}	
		alias = alias->next;
	}

	return 0;
}

void delete_users(void)
{
	struct oh323_user *user, *userlast;
	struct oh323_peer *peer;
	
	/* Delete all users */
	ast_mutex_lock(&userl.lock);
	for (user=userl.users;user;) {
		userlast = user;
		user=user->next;
		free(userlast);
	}
	userl.users=NULL;
	ast_mutex_unlock(&userl.lock);
	ast_mutex_lock(&peerl.lock);
	for (peer=peerl.peers;peer;) {
		/* Assume all will be deleted, and we'll find out for sure later */
		peer->delme = 1;
		peer = peer->next;
	}
	ast_mutex_unlock(&peerl.lock);
}

void delete_aliases(void)
{
	struct oh323_alias *alias, *aliaslast;
		
	/* Delete all users */
	ast_mutex_lock(&aliasl.lock);
	for (alias=aliasl.aliases;alias;) {
		aliaslast = alias;
		alias=alias->next;
		free(aliaslast);
	}
	aliasl.aliases=NULL;
	ast_mutex_unlock(&aliasl.lock);
}

void prune_peers(void)
{
	/* Prune peers who still are supposed to be deleted */
	struct oh323_peer *peer, *peerlast, *peernext;
	ast_mutex_lock(&peerl.lock);
	peerlast = NULL;
	for (peer=peerl.peers;peer;) {
		peernext = peer->next;
		if (peer->delme) {
			free(peer);
			if (peerlast) {
				peerlast->next = peernext;
			} else {
				peerl.peers = peernext;
			}
		} else {
			peerlast = peer;
		}
		peer = peernext;
	}
	ast_mutex_unlock(&peerl.lock);
}

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)
{
	delete_users();
	delete_aliases();
	prune_peers();
	reload_config();
	restart_monitor();
	return 0;
}

int reload(void)
{
	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 struct ast_rtp *oh323_get_rtp_peer(struct ast_channel *chan)
{
	struct oh323_pvt *pvt;
	pvt = (struct oh323_pvt *) chan->tech_pvt;
	if (pvt && pvt->rtp && pvt->options.bridge) {
		return pvt->rtp;
	}
	return NULL;
}

static struct ast_rtp *oh323_get_vrtp_peer(struct ast_channel *chan)
{
	return NULL;
}

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_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)
{
	/* XXX Deal with Video */
	struct oh323_pvt *pvt;
	struct sockaddr_in them;
	struct sockaddr_in us;
	char *mode;
	char iabuf[INET_ADDRSTRLEN];

	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);
	h323_native_bridge(pvt->cd.call_token, ast_inet_ntoa(iabuf, sizeof(iabuf), them.sin_addr), mode);
	return 0;
}

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

int load_module()
{
	int res;
	ast_mutex_init(&userl.lock);
	ast_mutex_init(&peerl.lock);
	ast_mutex_init(&aliasl.lock);
	sched = sched_context_create();
	if (!sched) {
		ast_log(LOG_WARNING, "Unable to create schedule context\n");
	}
	io = io_context_create();
	if (!io) {
		ast_log(LOG_WARNING, "Unable to create I/O context\n");
	}
	res = reload_config();
	if (res) {
		return 0;
	} else {
		/* Make sure we can register our channel type */
		if (ast_channel_register(&oh323_tech)) {
			ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
			h323_end_process();
			return -1;
		}
		ast_cli_register(&cli_debug);
		ast_cli_register(&cli_no_debug);
		ast_cli_register(&cli_trace);
		ast_cli_register(&cli_no_trace);
		ast_cli_register(&cli_show_codecs);
		ast_cli_register(&cli_gk_cycle);
		ast_cli_register(&cli_hangup_call);
		ast_cli_register(&cli_show_tokens);
		ast_cli_register(&cli_h323_reload);

		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, 
						send_digit,
						answer_call,
						progress,
						set_dtmf_payload,
						hangup_connection,
						set_local_capabilities);
		/* start the h.323 listener */
		if (h323_start_listener(h323_signalling_port, bindaddr)) {
			ast_log(LOG_ERROR, "Unable to create H323 listener.\n");
			return -1;
		}
		/* 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 0;
			}
		}
		/* And start the monitor for the first time */
		restart_monitor();
	}
	return res;
}

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

	/* unregister commands */
	ast_cli_unregister(&cli_debug);
	ast_cli_unregister(&cli_no_debug);
	ast_cli_unregister(&cli_trace);
	ast_cli_unregister(&cli_no_trace);   
	ast_cli_unregister(&cli_show_codecs);
	ast_cli_unregister(&cli_gk_cycle);
	ast_cli_unregister(&cli_hangup_call);
	ast_cli_unregister(&cli_show_tokens);
	ast_cli_unregister(&cli_h323_reload);
	ast_rtp_proto_unregister(&oh323_rtp);
	ast_channel_unregister(&oh323_tech);
		
	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 && (monitor_thread != AST_PTHREADT_STOP)) {
			/* this causes a seg, anyone know why? */
			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;
	}
	h323_gk_urq();
	h323_end_process();
	io_context_destroy(io);
	sched_context_destroy(sched);
	delete_users();
	delete_aliases();
	prune_peers();
	ast_mutex_destroy(&aliasl.lock);
	ast_mutex_destroy(&userl.lock);
	ast_mutex_destroy(&peerl.lock);
	return 0; 
} 

int usecount()
{
	return usecnt;
}

char *description()
{
	return (char *) desc;
}

char *key()
{
	return ASTERISK_GPL_KEY;
}