chan_ooh323.c

/*
 * Copyright (C) 2004-2005 by Objective Systems, Inc.
 *
 * This software is furnished under an open source license and may be 
 * used and copied only in accordance with the terms of this license. 
 * The text of the license may generally be found in the root 
 * directory of this installation in the COPYING file.  It 
 * can also be viewed online at the following URL:
 *
 *   http://www.obj-sys.com/open/license.html
 *
 * Any redistributions of this file including modified versions must 
 * maintain this copyright notice.
 *
 *****************************************************************************/

/* Reworked version I, Nov-2009, by Alexandr Anikin, may@telecom-service.ru */


/*** MODULEINFO
	<defaultenabled>no</defaultenabled>
	<support_level>extended</support_level>
 ***/

#include "chan_ooh323.h"
#include <math.h>

#define FORMAT_STRING_SIZE	512

/* Defaults */
#define DEFAULT_CONTEXT "default"
#define DEFAULT_H323ID "Asterisk PBX"
#define DEFAULT_LOGFILE "/var/log/asterisk/h323_log"
#define DEFAULT_H323ACCNT "ast_h323"

/* Flags */
#define H323_SILENCESUPPRESSION (1<<0)
#define H323_GKROUTED           (1<<1)
#define H323_TUNNELING          (1<<2)
#define H323_FASTSTART          (1<<3)
#define H323_OUTGOING           (1<<4)
#define H323_ALREADYGONE        (1<<5)
#define H323_NEEDDESTROY        (1<<6)
#define H323_DISABLEGK          (1<<7)
#define H323_NEEDSTART		(1<<8)

#define MAXT30	240
#define T38TOAUDIOTIMEOUT 30
#define T38_DISABLED 0
#define T38_ENABLED 1
#define T38_FAXGW 1

#define FAXDETECT_CNG	1
#define FAXDETECT_T38	2

/* Channel description */
static const char type[] = "OOH323";
static const char tdesc[] = "Objective Systems H323 Channel Driver";
static const char config[] = "ooh323.conf";

struct ast_module *myself;

static struct ast_jb_conf default_jbconf =
{
	.flags = 0,
	.max_size = -1,
	.resync_threshold = -1,
	.impl = ""
};
static struct ast_jb_conf global_jbconf;

/* Channel Definition */
static struct ast_channel *ooh323_request(const char *type, struct ast_format_cap *cap,
			const struct ast_channel *requestor,  const char *data, int *cause);
static int ooh323_digit_begin(struct ast_channel *ast, char digit);
static int ooh323_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int ooh323_call(struct ast_channel *ast, const char *dest, int timeout);
static int ooh323_hangup(struct ast_channel *ast);
static int ooh323_answer(struct ast_channel *ast);
static struct ast_frame *ooh323_read(struct ast_channel *ast);
static int ooh323_write(struct ast_channel *ast, struct ast_frame *f);
static int ooh323_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
static int ooh323_queryoption(struct ast_channel *ast, int option, void *data, int *datalen);
static int ooh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
static int function_ooh323_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len);
static int function_ooh323_write(struct ast_channel *chan, const char *cmd, char *data, const char *value);

static enum ast_rtp_glue_result ooh323_get_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance **rtp);
static enum ast_rtp_glue_result ooh323_get_vrtp_peer(struct ast_channel *chan, struct ast_rtp_instance **rtp);
static int ooh323_set_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance *rtp, 
          struct ast_rtp_instance *vrtp, struct ast_rtp_instance *trtp, const struct ast_format_cap *codecs, int nat_active);

static struct ast_udptl *ooh323_get_udptl_peer(struct ast_channel *chan);
static int ooh323_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);

static void print_codec_to_cli(int fd, struct ast_codec_pref *pref);

struct ooh323_peer *find_friend(const char *name, int port);


static struct ast_channel_tech ooh323_tech = {
	.type = type,
	.description = tdesc,
	.properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
	.requester = ooh323_request,
	.send_digit_begin = ooh323_digit_begin,
	.send_digit_end = ooh323_digit_end,
	.call = ooh323_call,
	.hangup = ooh323_hangup,
	.answer = ooh323_answer,
	.read = ooh323_read,
	.write = ooh323_write,
	.exception = ooh323_read,
	.indicate = ooh323_indicate,
	.fixup = ooh323_fixup,
	.send_html = 0,
	.queryoption = ooh323_queryoption,
	.bridge = ast_rtp_instance_bridge,		/* XXX chan unlocked ? */
	.early_bridge = ast_rtp_instance_early_bridge,
	.func_channel_read = function_ooh323_read,
	.func_channel_write = function_ooh323_write,
};

static struct ast_rtp_glue ooh323_rtp = {
	.type = type,
	.get_rtp_info = ooh323_get_rtp_peer,
	.get_vrtp_info = ooh323_get_vrtp_peer,
	.update_peer = ooh323_set_rtp_peer,
};

static struct ast_udptl_protocol ooh323_udptl = {
	type: "H323",
	get_udptl_info: ooh323_get_udptl_peer,
	set_udptl_peer: ooh323_set_udptl_peer,
};



struct ooh323_user;

/* H.323 channel private structure */
static struct ooh323_pvt {
	ast_mutex_t lock;		/* Channel private lock */
	struct ast_rtp_instance *rtp;
	struct ast_rtp_instance *vrtp; /* Placeholder for now */

	int t38support;			/* T.38 mode - disable, transparent, faxgw */
	int faxdetect;
	int faxdetected;
	int rtptimeout;
	struct ast_udptl *udptl;
	int faxmode;
	int t38_tx_enable;
	int t38_init;
	struct ast_sockaddr udptlredirip;
	time_t lastTxT38;
	int chmodepend;

	struct ast_channel *owner;	/* Master Channel */
   	union {
    		char  *user;	/* cooperating user/peer */
    		char  *peer;
   	} neighbor;
	time_t lastrtptx;
	time_t lastrtprx;
	unsigned int flags;
	unsigned int call_reference;
	char *callToken;
	char *username;
	char *host;
	char *callerid_name;
	char *callerid_num;
	char caller_h323id[AST_MAX_EXTENSION];
	char caller_dialedDigits[AST_MAX_EXTENSION];
	char caller_email[AST_MAX_EXTENSION];
	char caller_url[256];
	char callee_h323id[AST_MAX_EXTENSION];
	char callee_dialedDigits[AST_MAX_EXTENSION];
	char callee_email[AST_MAX_EXTENSION];
	char callee_url[AST_MAX_EXTENSION];
 
	int port;
	struct ast_format readformat;   /* negotiated read format */
	struct ast_format writeformat;  /* negotiated write format */
	struct ast_format_cap *cap;
	struct ast_codec_pref prefs;
	int dtmfmode;
	int dtmfcodec;
	char exten[AST_MAX_EXTENSION];	/* Requested extension */
	char context[AST_MAX_EXTENSION];	/* Context where to start */
	char accountcode[256];	/* Account code */
	int nat;
	int amaflags;
	int progsent;			/* progress is sent */
	int alertsent;			/* alerting is sent */
	int g729onlyA;			/* G.729 only A */
	struct ast_dsp *vad;
	struct OOH323Regex *rtpmask;	/* rtp ip regexp */
	char rtpmaskstr[120];
	int rtdrcount, rtdrinterval;	/* roundtripdelayreq */
	int faststart, h245tunneling;	/* faststart & h245 tunneling */
	struct ooh323_pvt *next;	/* Next entity */
} *iflist = NULL;

/* Protect the channel/interface list (ooh323_pvt) */
AST_MUTEX_DEFINE_STATIC(iflock);

/* Profile of H.323 user registered with PBX*/
struct ooh323_user{
	ast_mutex_t lock;
	char		name[256];
	char		context[AST_MAX_EXTENSION];
	int		incominglimit;
	unsigned	inUse;
	char		accountcode[20];
	int		amaflags;
	struct ast_format_cap *cap;
	struct ast_codec_pref prefs;
	int		dtmfmode;
	int		dtmfcodec;
	int		faxdetect;
	int		t38support;
	int		rtptimeout;
	int		mUseIP;        /* Use IP address or H323-ID to search user */
	char		mIP[4*8+7+2];  /* Max for IPv6 - 2 brackets, 8 4hex, 7 - : */
	struct OOH323Regex *rtpmask;
	char		rtpmaskstr[120];
	int		rtdrcount, rtdrinterval;
	int		nat;
	int		faststart, h245tunneling;
	int		g729onlyA;
	struct ooh323_user *next;
};

/* Profile of valid asterisk peers */
struct ooh323_peer{
	ast_mutex_t lock;
	char        name[256];
	unsigned    outgoinglimit;
	unsigned    outUse;
	struct ast_format_cap *cap;
	struct ast_codec_pref prefs;
	char        accountcode[20];
	int         amaflags;
	int         dtmfmode;
	int	    dtmfcodec;
	int	    faxdetect;
	int	    t38support;
	int         mFriend;    /* indicates defined as friend */
	char        ip[4*8+7+2]; /* Max for IPv6 - 2 brackets, 8 4hex, 7 - : */
	int         port;
	char        *h323id;    /* H323-ID alias, which asterisk will register with gk to reach this peer*/
	char        *email;     /* Email alias, which asterisk will register with gk to reach this peer*/
	char        *url;       /* url alias, which asterisk will register with gk to reach this peer*/
	char        *e164;      /* e164 alias, which asterisk will register with gk to reach this peer*/
	int         rtptimeout;
	struct OOH323Regex	    *rtpmask;
	char	    rtpmaskstr[120];
	int	    rtdrcount,rtdrinterval;
	int	    nat;
	int	    faststart, h245tunneling;
	int	    g729onlyA;
	struct ooh323_peer *next;
};


/* List of H.323 users known to PBX */
static struct ast_user_list {
	struct ooh323_user *users;
	ast_mutex_t lock;
} userl;

static struct ast_peer_list {
	struct ooh323_peer *peers;
	ast_mutex_t lock;
} peerl;

/* Mutex to protect H.323 reload process */
static int h323_reloading = 0;
AST_MUTEX_DEFINE_STATIC(h323_reload_lock);

/* Mutex to protect usage counter */
static int usecnt = 0;
AST_MUTEX_DEFINE_STATIC(usecnt_lock);

AST_MUTEX_DEFINE_STATIC(ooh323c_cmd_lock);

static long callnumber = 0;
AST_MUTEX_DEFINE_STATIC(ooh323c_cn_lock);

/* stack callbacks */
int onAlerting(ooCallData *call);
int onProgress(ooCallData *call);
int onNewCallCreated(ooCallData *call);
int onOutgoingCall(ooCallData *call);
int onCallEstablished(ooCallData *call);
int onCallCleared(ooCallData *call);
void onModeChanged(ooCallData *call, int t38mode);

static char gLogFile[256] = DEFAULT_LOGFILE;
static int  gPort = 1720;
static char gIP[2+8*4+7];	/* Max for IPv6 addr */
struct ast_sockaddr bindaddr;
int v6mode = 0;
static char gCallerID[AST_MAX_EXTENSION] = "";
static struct ooAliases *gAliasList;
static struct ast_format_cap *gCap;
static struct ast_codec_pref gPrefs;
static int  gDTMFMode = H323_DTMF_RFC2833;
static int  gDTMFCodec = 101;
static int  gFAXdetect = FAXDETECT_CNG;
static int  gT38Support = T38_FAXGW;
static char gGatekeeper[100];
static enum RasGatekeeperMode gRasGkMode = RasNoGatekeeper;

static int  gIsGateway = 0;
static int  gFastStart = 1;
static int  gTunneling = 1;
static int  gBeMaster = 0;
static int  gMediaWaitForConnect = 0;
static int  gTOS = 0;
static int  gRTPTimeout = 60;
static int  g729onlyA = 0;
static char gAccountcode[80] = DEFAULT_H323ACCNT;
static int  gAMAFLAGS;
static char gContext[AST_MAX_EXTENSION] = DEFAULT_CONTEXT;
static int  gIncomingLimit = 1024;
static int  gOutgoingLimit = 1024;
OOBOOL gH323Debug = FALSE;
static int gTRCLVL = OOTRCLVLERR;
static int gRTDRCount = 0, gRTDRInterval = 0;
static int gNat = FALSE;

static int t35countrycode = 0;
static int t35extensions = 0;
static int manufacturer = 0;
static char vendor[AST_MAX_EXTENSION] =  "";
static char version[AST_MAX_EXTENSION] = "";

static struct ooh323_config
{
   int  mTCPPortStart;
   int  mTCPPortEnd;
} ooconfig;

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

/* 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);


/* 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 struct ast_channel *ooh323_new(struct ooh323_pvt *i, int state,
                                             const char *host, struct ast_format_cap *cap, const char *linkedid)
{
	struct ast_channel *ch = NULL;
	struct ast_format tmpfmt;
	int features = 0;

	if (gH323Debug) {
		ast_verb(0, "---   ooh323_new - %s\n", host);
	}

	ast_format_clear(&tmpfmt);
	/* Don't hold a h323 pvt lock while we allocate a channel */
	ast_mutex_unlock(&i->lock);
   	ast_mutex_lock(&ooh323c_cn_lock);
   	ch = ast_channel_alloc(1, state, i->callerid_num, i->callerid_name, 
				i->accountcode, i->exten, i->context, linkedid, i->amaflags,
				"OOH323/%s-%ld", host, callnumber);
   	callnumber++;
   	ast_mutex_unlock(&ooh323c_cn_lock);
   
	ast_mutex_lock(&i->lock);

	if (ch) {
		ast_channel_lock(ch);
		ch->tech = &ooh323_tech;

		if (cap)
			ast_best_codec(cap, &tmpfmt);
		if (!tmpfmt.id)
			ast_codec_pref_index(&i->prefs, 0, &tmpfmt);

		ast_format_cap_add(ch->nativeformats, &tmpfmt);
		ast_format_copy(&ch->rawwriteformat, &tmpfmt);
		ast_format_copy(&ch->rawreadformat, &tmpfmt);

		ast_jb_configure(ch, &global_jbconf);

		if (state == AST_STATE_RING)
			ch->rings = 1;

		ch->adsicpe = AST_ADSI_UNAVAILABLE;
		ast_set_write_format(ch, &tmpfmt);
		ast_set_read_format(ch, &tmpfmt);
		ch->tech_pvt = i;
		i->owner = ch;
		ast_module_ref(myself);

		/* Allocate dsp for in-band DTMF support */
		if ((i->dtmfmode & H323_DTMF_INBAND) || (i->faxdetect & FAXDETECT_CNG)) {
			i->vad = ast_dsp_new();
		}

		/* inband DTMF*/
		if (i->dtmfmode & H323_DTMF_INBAND) {
			features |= DSP_FEATURE_DIGIT_DETECT;
			if (i->dtmfmode & H323_DTMF_INBANDRELAX) {
				ast_dsp_set_digitmode(i->vad, DSP_DIGITMODE_DTMF | DSP_DIGITMODE_RELAXDTMF);
			}
		}

		/* fax detection*/
		if (i->faxdetect & FAXDETECT_CNG) {
			features |= DSP_FEATURE_FAX_DETECT;
			ast_dsp_set_faxmode(i->vad,
					DSP_FAXMODE_DETECT_CNG | DSP_FAXMODE_DETECT_CED);
		}

		if (features) {
			ast_dsp_set_features(i->vad, features);
		}

		ast_mutex_lock(&usecnt_lock);
		usecnt++;
		ast_mutex_unlock(&usecnt_lock);

		/* Notify the module monitors that use count for resource has changed*/
		ast_update_use_count();

		ast_copy_string(ch->context, i->context, sizeof(ch->context));
		ast_copy_string(ch->exten, i->exten, sizeof(ch->exten));

		ch->priority = 1;

      		if(!ast_test_flag(i, H323_OUTGOING)) {
		
			if (!ast_strlen_zero(i->caller_h323id)) {
				pbx_builtin_setvar_helper(ch, "_CALLER_H323ID", i->caller_h323id);

			}
			if (!ast_strlen_zero(i->caller_dialedDigits)) {
				pbx_builtin_setvar_helper(ch, "_CALLER_H323DIALEDDIGITS", 
				i->caller_dialedDigits);
			}
			if (!ast_strlen_zero(i->caller_email)) {
				pbx_builtin_setvar_helper(ch, "_CALLER_H323EMAIL", 
				i->caller_email);
			}
			if (!ast_strlen_zero(i->caller_url)) {
				pbx_builtin_setvar_helper(ch, "_CALLER_H323URL", i->caller_url);
			}
		}

		if (!ast_strlen_zero(i->accountcode))
			ast_channel_accountcode_set(ch, i->accountcode);
		
		if (i->amaflags)
			ch->amaflags = i->amaflags;

		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", ast_channel_name(ch));
            			ast_channel_unlock(ch);
				ast_hangup(ch);
				ch = NULL;
			} 
	 	}

		manager_event(EVENT_FLAG_SYSTEM, "ChannelUpdate", "Channel: %s\r\nChanneltype: %s\r\n"
				"CallRef: %d\r\n", ast_channel_name(ch), "OOH323", i->call_reference);
	} else
		ast_log(LOG_WARNING, "Unable to allocate channel structure\n");


   	if(ch)   ast_channel_unlock(ch);

	if (gH323Debug) {
		ast_verb(0, "+++   h323_new\n");
	}

	return ch;
}



static struct ooh323_pvt *ooh323_alloc(int callref, char *callToken) 
{
	struct ooh323_pvt *pvt = NULL;

	if (gH323Debug) {
		ast_verb(0, "---   ooh323_alloc\n");
	}

	if (!(pvt = ast_calloc(1, sizeof(*pvt)))) {
		ast_log(LOG_ERROR, "Couldn't allocate private ooh323 structure\n");
		return NULL;
	}
	if (!(pvt->cap = ast_format_cap_alloc_nolock())) {
		ast_free(pvt);
		ast_log(LOG_ERROR, "Couldn't allocate private ooh323 structure\n");
		return NULL;
	}

	ast_mutex_init(&pvt->lock);
	ast_mutex_lock(&pvt->lock);

	pvt->faxmode = 0;
	pvt->chmodepend = 0;
	pvt->faxdetected = 0;
	pvt->faxdetect = gFAXdetect;
	pvt->t38support = gT38Support;
	pvt->rtptimeout = gRTPTimeout;
	pvt->nat = gNat;
	pvt->rtdrinterval = gRTDRInterval;
	pvt->rtdrcount = gRTDRCount;
	pvt->g729onlyA = g729onlyA;

	pvt->call_reference = callref;
	if (callToken)
		pvt->callToken = strdup(callToken);

	/* whether to use gk for this call */
	if (gRasGkMode == RasNoGatekeeper)
		OO_SETFLAG(pvt->flags, H323_DISABLEGK);

	pvt->dtmfmode = gDTMFMode;
	pvt->dtmfcodec = gDTMFCodec;
	ast_copy_string(pvt->context, gContext, sizeof(pvt->context));
	ast_copy_string(pvt->accountcode, gAccountcode, sizeof(pvt->accountcode));

	pvt->amaflags = gAMAFLAGS;
	ast_format_cap_copy(pvt->cap, gCap);
	memcpy(&pvt->prefs, &gPrefs, sizeof(pvt->prefs));

	ast_mutex_unlock(&pvt->lock); 
	/* Add to interface list */
	ast_mutex_lock(&iflock);
	pvt->next = iflist;
	iflist = pvt;
	ast_mutex_unlock(&iflock);

	if (gH323Debug) {
		ast_verb(0, "+++   ooh323_alloc\n");
	}

	return pvt;
}


/*
	Possible data values - peername, exten/peername, exten@ip
 */
static struct ast_channel *ooh323_request(const char *type, struct ast_format_cap *cap,
		const struct ast_channel *requestor, const char *data, int *cause)

{
	struct ast_channel *chan = NULL;
	struct ooh323_pvt *p = NULL;
	struct ooh323_peer *peer = NULL;
	char *dest = NULL; 
	char *ext = NULL;
	char tmp[256];
	char formats[FORMAT_STRING_SIZE];
	int port = 0;

	if (gH323Debug)
		ast_verb(0, "---   ooh323_request - data %s format %s\n", data,
										ast_getformatname_multiple(formats,FORMAT_STRING_SIZE,cap));

	if (!(ast_format_cap_has_type(cap, AST_FORMAT_TYPE_AUDIO))) {
		ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%s'\n", ast_getformatname_multiple(formats,FORMAT_STRING_SIZE,cap));
		return NULL;
	}

	p = ooh323_alloc(0,0); /* Initial callRef is zero */

	if (!p) {
		ast_log(LOG_WARNING, "Unable to build pvt data for '%s'\n", data);
		return NULL;
	}
	ast_mutex_lock(&p->lock);

	/* This is an outgoing call, since ooh323_request is called */
	ast_set_flag(p, H323_OUTGOING);


   	ast_copy_string(tmp, data, sizeof(tmp));

	dest = strchr(tmp, '/');

	if (dest) {  
		*dest = '\0';
		dest++;
		ext = dest;
		dest = tmp;
	} else if ((dest = strchr(tmp, '@'))) {
		*dest = '\0';
		dest++;
		ext = tmp;
	} else {
		dest = tmp;
		ext = NULL;
	}

#if 0
	if ((sport = strchr(dest, ':'))) {
		*sport = '\0';
		sport++;
		port = atoi(sport);
	}
#endif

	if (dest) {
		peer = find_peer(dest, port);
	} else{
		ast_mutex_lock(&iflock);
		ast_mutex_unlock(&p->lock);
		ooh323_destroy(p);
		ast_mutex_unlock(&iflock);
		ast_log(LOG_ERROR, "Destination format is not supported\n");
		return NULL;
	}

	if (peer) {
		p->username = strdup(peer->name);
		p->host = strdup(peer->ip);
		p->port = peer->port;
		/* Disable gk as we are going to call a known peer*/
		/* OO_SETFLAG(p->flags, H323_DISABLEGK); */

		if (ext)
			ast_copy_string(p->exten, ext, sizeof(p->exten));

		ast_format_cap_copy(p->cap, peer->cap);
		memcpy(&p->prefs, &peer->prefs, sizeof(struct ast_codec_pref));
		p->g729onlyA = peer->g729onlyA;
		p->dtmfmode |= peer->dtmfmode;
		p->dtmfcodec  = peer->dtmfcodec;
		p->faxdetect = peer->faxdetect;
		p->t38support = peer->t38support;
		p->rtptimeout = peer->rtptimeout;
		p->nat = peer->nat;
		p->faststart = peer->faststart;
		p->h245tunneling = peer->h245tunneling;
		if (peer->rtpmask && peer->rtpmaskstr[0]) {
			p->rtpmask = peer->rtpmask;
			ast_copy_string(p->rtpmaskstr, peer->rtpmaskstr, sizeof(p->rtpmaskstr));
		}

		if (peer->rtdrinterval) {
			p->rtdrinterval = peer->rtdrinterval;
			p->rtdrcount = peer->rtdrcount;
		}

		ast_copy_string(p->accountcode, peer->accountcode, sizeof(p->accountcode));
		p->amaflags = peer->amaflags;
	} else {
		if (gRasGkMode ==  RasNoGatekeeper) {
			/* no gk and no peer */
			ast_log(LOG_ERROR, "Call to undefined peer %s", dest);
			ast_mutex_lock(&iflock);
			ast_mutex_unlock(&p->lock);
			ooh323_destroy(p);
			ast_mutex_unlock(&iflock);
			return NULL;
		}
		p->g729onlyA = g729onlyA;
		p->dtmfmode = gDTMFMode;
		p->dtmfcodec = gDTMFCodec;
		p->faxdetect = gFAXdetect;
		p->t38support = gT38Support;
		p->rtptimeout = gRTPTimeout;
		p->nat = gNat;
		ast_format_cap_copy(p->cap, gCap);
		p->rtdrinterval = gRTDRInterval;
		p->rtdrcount = gRTDRCount;
		p->faststart = gFastStart;
		p->h245tunneling = gTunneling;

		memcpy(&p->prefs, &gPrefs, sizeof(struct ast_codec_pref));
		p->username = strdup(dest);

		p->host = strdup(dest);
		if (port > 0) {
			p->port = port;
		}
		if (ext) {
			ast_copy_string(p->exten, ext, sizeof(p->exten));
		}
	}


	chan = ooh323_new(p, AST_STATE_DOWN, p->username, cap,
				 requestor ? ast_channel_linkedid(requestor) : NULL);
	
	ast_mutex_unlock(&p->lock);

	if (!chan) {
		ast_mutex_lock(&iflock);
		ooh323_destroy(p);
		ast_mutex_unlock(&iflock);
   	} else {
      		ast_mutex_lock(&p->lock);
      		p->callToken = (char*)ast_calloc(1, AST_MAX_EXTENSION);
      		if(!p->callToken) {
       			ast_mutex_unlock(&p->lock);
       			ast_mutex_lock(&iflock);
       			ooh323_destroy(p);
       			ast_mutex_unlock(&iflock);
       			ast_log(LOG_ERROR, "Failed to allocate memory for callToken\n");
       			return NULL;
      		}

      		ast_mutex_unlock(&p->lock);
      		ast_mutex_lock(&ooh323c_cmd_lock);
      		ooMakeCall(data, p->callToken, AST_MAX_EXTENSION, NULL);
      		ast_mutex_unlock(&ooh323c_cmd_lock);
	}

	restart_monitor();
	if (gH323Debug)
		ast_verb(0, "+++   ooh323_request\n");

	return chan;

}


static struct ooh323_pvt* find_call(ooCallData *call)
{
	struct ooh323_pvt *p;

	if (gH323Debug)
		ast_verb(0, "---   find_call\n");

	ast_mutex_lock(&iflock);

	for (p = iflist; p; p = p->next) {
		if (p->callToken && !strcmp(p->callToken, call->callToken)) {
			break;
		}
	}
	ast_mutex_unlock(&iflock);

	if (gH323Debug)
		ast_verb(0, "+++   find_call\n");

	return p;
}

struct ooh323_user *find_user(const char * name, const char* ip)
{
	struct ooh323_user *user;

	if (gH323Debug)
      ast_verb(0, "---   find_user: %s, %s\n",name,ip);

	ast_mutex_lock(&userl.lock);

	for (user = userl.users; user; user = user->next) {
		if (ip && user->mUseIP && !strcmp(user->mIP, ip)) {
			break;
		}
		if (name && !strcmp(user->name, name)) {
			break;
		}
	}

	ast_mutex_unlock(&userl.lock);

	if (gH323Debug)
		ast_verb(0, "+++   find_user\n");

	return user;
}

struct ooh323_peer *find_friend(const char *name, int port)
{
	struct ooh323_peer *peer;  

	if (gH323Debug)
		ast_verb(0, "---   find_friend \"%s\"\n", name);


	ast_mutex_lock(&peerl.lock);
	for (peer = peerl.peers; peer; peer = peer->next) {
		if (gH323Debug) {
			ast_verb(0, "		comparing with \"%s\"\n", peer->ip);
		}
		if (!strcmp(peer->ip, name)) {
			if (port <= 0 || (port > 0 && peer->port == port)) {
				break;
			}
		}
	}
	ast_mutex_unlock(&peerl.lock);

	if (gH323Debug) {
		if (peer) {
			ast_verb(0, "		found matching friend\n");
		}
		ast_verb(0, "+++   find_friend \"%s\"\n", name);
	}

	return peer;		
}


struct ooh323_peer *find_peer(const char * name, int port)
{
	struct ooh323_peer *peer;

	if (gH323Debug)
		ast_verb(0, "---   find_peer \"%s\"\n", name);


	ast_mutex_lock(&peerl.lock);
	for (peer = peerl.peers; peer; peer = peer->next) {
		if (gH323Debug) {
			ast_verb(0, "		comparing with \"%s\"\n", peer->ip);
		}
		if (!strcasecmp(peer->name, name))
			break;
		if (peer->h323id && !strcasecmp(peer->h323id, name))
			break;
		if (peer->e164 && !strcasecmp(peer->e164, name))
			break;
		/*
		if (!strcmp(peer->ip, name)) {
			if (port > 0 && peer->port == port) { break; }
			else if (port <= 0) { break; }
		}
		*/
	}
	ast_mutex_unlock(&peerl.lock);

	if (gH323Debug) {
		if (peer) {
			ast_verb(0, "		found matching peer\n");
		}
		ast_verb(0, "+++   find_peer \"%s\"\n", name);
	}

	return peer;		
}

static int ooh323_digit_begin(struct ast_channel *chan, char digit)
{
	char dtmf[2];
	struct ooh323_pvt *p = (struct ooh323_pvt *) chan->tech_pvt;
	int res = 0;
	
	if (gH323Debug)
		ast_verb(0, "---   ooh323_digit_begin\n");

	if (!p) {
		ast_log(LOG_ERROR, "No private structure for call\n");
		return -1;
	}
	ast_mutex_lock(&p->lock);

	if (p->rtp && ((p->dtmfmode & H323_DTMF_RFC2833) || (p->dtmfmode & H323_DTMF_CISCO))) {
		ast_rtp_instance_dtmf_begin(p->rtp, digit);
	} else if (((p->dtmfmode & H323_DTMF_Q931) ||
						 (p->dtmfmode & H323_DTMF_H245ALPHANUMERIC) ||
						 (p->dtmfmode & H323_DTMF_H245SIGNAL))) {
		dtmf[0] = digit;
		dtmf[1] = '\0';
		ooSendDTMFDigit(p->callToken, dtmf);
	} else if (p->dtmfmode & H323_DTMF_INBAND) {
		res = -1; // tell Asterisk to generate inband indications
	}
	ast_mutex_unlock(&p->lock);

	if (gH323Debug) {
		ast_verb(0, "+++   ooh323_digit_begin %d\n", res);
	}
	return res;
}

static int ooh323_digit_end(struct ast_channel *chan, char digit, unsigned int duration)
{
	struct ooh323_pvt *p = (struct ooh323_pvt *) chan->tech_pvt;
	int res = 0;

	if (gH323Debug)
		ast_verb(0, "---   ooh323_digit_end\n");

	if (!p) {
		ast_log(LOG_ERROR, "No private structure for call\n");
		return -1;
	}
	ast_mutex_lock(&p->lock);
	if (p->rtp && ((p->dtmfmode & H323_DTMF_RFC2833) || (p->dtmfmode & H323_DTMF_CISCO)) ) {
		ast_rtp_instance_dtmf_end(p->rtp, digit);
	} else if(p->dtmfmode & H323_DTMF_INBAND) {
		res = -1; // tell Asterisk to stop inband indications
	}

	ast_mutex_unlock(&p->lock);

	if (gH323Debug) {
		ast_verb(0, "+++   ooh323_digit_end, res = %d\n", res);
	}

	return res;
}


static int ooh323_call(struct ast_channel *ast, const char *dest, int timeout)
{
	struct ooh323_pvt *p = ast->tech_pvt;
	char destination[256];
   	int res=0, i;
	const char *val = NULL;
	ooCallOptions opts = {
		.fastStart = TRUE,
		.tunneling = TRUE,
		.disableGk = TRUE,
      		.callMode = OO_CALLMODE_AUDIOCALL,
      		.transfercap = 0
	};

	if (gH323Debug)
		ast_verb(0, "---   ooh323_call- %s\n", dest);


   	if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
		ast_log(LOG_WARNING, "ooh323_call called on %s, neither down nor "
								"reserved\n", ast_channel_name(ast));
		return -1;
	}
	ast_mutex_lock(&p->lock);
	ast_set_flag(p, H323_OUTGOING);
	if (ast->connected.id.number.valid && ast->connected.id.number.str) {
		free(p->callerid_num);
		p->callerid_num = strdup(ast->connected.id.number.str);
	}

	if (ast->connected.id.name.valid && ast->connected.id.name.str) {
		free(p->callerid_name);
		p->callerid_name = strdup(ast->connected.id.name.str);
	} else if (ast->connected.id.number.valid && ast->connected.id.number.str) {
		free(p->callerid_name);
		p->callerid_name = strdup(ast->connected.id.number.str);
	} else {
		ast->connected.id.name.valid = 1;
		free(ast->connected.id.name.str);
		ast->connected.id.name.str = strdup(gCallerID);
		free(p->callerid_name);
		p->callerid_name = strdup(ast->connected.id.name.str);
	}

	/* Retrieve vars */


	if ((val = pbx_builtin_getvar_helper(ast, "CALLER_H323ID"))) {
		ast_copy_string(p->caller_h323id, val, sizeof(p->caller_h323id));
	}
	
	if ((val = pbx_builtin_getvar_helper(ast, "CALLER_H323DIALEDDIGITS"))) {
		ast_copy_string(p->caller_dialedDigits, val, sizeof(p->caller_dialedDigits));
      		if(!p->callerid_num)
			p->callerid_num = strdup(val);
	}

	if ((val = pbx_builtin_getvar_helper(ast, "CALLER_H323EMAIL"))) {
		ast_copy_string(p->caller_email, val, sizeof(p->caller_email));
	}

	if ((val = pbx_builtin_getvar_helper(ast, "CALLER_H323URL"))) {
		ast_copy_string(p->caller_url, val, sizeof(p->caller_url));
	}

	if (p->host && p->port != 0)
		snprintf(destination, sizeof(destination), "%s:%d", p->host, p->port);
	else if (p->host)
		snprintf(destination, sizeof(destination), "%s", p->host);
	else
		ast_copy_string(destination, dest, sizeof(destination));

	destination[sizeof(destination)-1]='\0';

	opts.transfercap = ast->transfercapability;
	opts.fastStart = p->faststart;
	opts.tunneling = p->h245tunneling;

	for (i=0;i<480 && !isRunning(p->callToken);i++) usleep(12000);

	if(OO_TESTFLAG(p->flags, H323_DISABLEGK)) {