callbacks.c 39.1 KB
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/*
linphone
Copyright (C) 2010  Simon MORLAT (simon.morlat@free.fr)

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/


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#include "sal/sal.h"
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#include "linphonecore.h"
#include "private.h"
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#include "mediastreamer2/mediastream.h"
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#include "lpconfig.h"
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// stat
#ifndef WIN32
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#endif

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static void register_failure(SalOp *op, SalError error, SalReason reason, const char *details);
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static int media_parameters_changed(LinphoneCall *call, SalMediaDescription *oldmd, SalMediaDescription *newmd) {
	if (call->params.in_conference != call->current_params.in_conference) return SAL_MEDIA_DESCRIPTION_CHANGED;
	if (call->up_bw != linphone_core_get_upload_bandwidth(call->core)) return SAL_MEDIA_DESCRIPTION_CHANGED;
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	if (call->localdesc_changed) ms_message("Local description has changed: %i", call->localdesc_changed);
	return call->localdesc_changed | sal_media_description_equals(oldmd, newmd);
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}

void linphone_core_update_streams_destinations(LinphoneCore *lc, LinphoneCall *call, SalMediaDescription *old_md, SalMediaDescription *new_md) {
	SalStreamDescription *new_audiodesc = NULL;
	SalStreamDescription *new_videodesc = NULL;
	char *rtp_addr, *rtcp_addr;
	int i;

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	for (i = 0; i < new_md->n_active_streams; i++) {
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		if (new_md->streams[i].type == SalAudio) {
			new_audiodesc = &new_md->streams[i];
		} else if (new_md->streams[i].type == SalVideo) {
			new_videodesc = &new_md->streams[i];
		}
	}
	if (call->audiostream && new_audiodesc) {
		rtp_addr = (new_audiodesc->rtp_addr[0] != '\0') ? new_audiodesc->rtp_addr : new_md->addr;
		rtcp_addr = (new_audiodesc->rtcp_addr[0] != '\0') ? new_audiodesc->rtcp_addr : new_md->addr;
		ms_message("Change audio stream destination: RTP=%s:%d RTCP=%s:%d", rtp_addr, new_audiodesc->rtp_port, rtcp_addr, new_audiodesc->rtcp_port);
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		rtp_session_set_remote_addr_full(call->audiostream->ms.session, rtp_addr, new_audiodesc->rtp_port, rtcp_addr, new_audiodesc->rtcp_port);
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	}
#ifdef VIDEO_ENABLED
	if (call->videostream && new_videodesc) {
		rtp_addr = (new_videodesc->rtp_addr[0] != '\0') ? new_videodesc->rtp_addr : new_md->addr;
		rtcp_addr = (new_videodesc->rtcp_addr[0] != '\0') ? new_videodesc->rtcp_addr : new_md->addr;
		ms_message("Change video stream destination: RTP=%s:%d RTCP=%s:%d", rtp_addr, new_videodesc->rtp_port, rtcp_addr, new_videodesc->rtcp_port);
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		rtp_session_set_remote_addr_full(call->videostream->ms.session, rtp_addr, new_videodesc->rtp_port, rtcp_addr, new_videodesc->rtcp_port);
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	}
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#else
	(void)new_videodesc;
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#endif
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}

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void linphone_core_update_streams(LinphoneCore *lc, LinphoneCall *call, SalMediaDescription *new_md){
	SalMediaDescription *oldmd=call->resultdesc;
	
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	linphone_core_stop_ringing(lc);
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	if (new_md!=NULL){
		sal_media_description_ref(new_md);
		call->media_pending=FALSE;
	}else{
		call->media_pending=TRUE;
	}
	call->resultdesc=new_md;
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	if ((call->audiostream && call->audiostream->ms.ticker) || (call->videostream && call->videostream->ms.ticker)){
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		/* we already started media: check if we really need to restart it*/
		if (oldmd){
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			int md_changed = media_parameters_changed(call, oldmd, new_md);
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			if ((md_changed & SAL_MEDIA_DESCRIPTION_CODEC_CHANGED) || call->playing_ringbacktone) {
				ms_message("Media descriptions are different, need to restart the streams.");
			} else {
				if (md_changed == SAL_MEDIA_DESCRIPTION_UNCHANGED) {
					if (call->all_muted){
						ms_message("Early media finished, unmuting inputs...");
						/*we were in early media, now we want to enable real media */
						linphone_call_enable_camera (call,linphone_call_camera_enabled (call));
						if (call->audiostream)
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							linphone_core_enable_mic(lc, linphone_core_mic_enabled(lc));
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#ifdef VIDEO_ENABLED
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						if (call->videostream && call->camera_active)
							video_stream_change_camera(call->videostream,lc->video_conf.device );
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#endif
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					}
					ms_message("No need to restart streams, SDP is unchanged.");
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					goto end;
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				}else {
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					if (md_changed & SAL_MEDIA_DESCRIPTION_NETWORK_CHANGED) {
						ms_message("Network parameters have changed, update them.");
						linphone_core_update_streams_destinations(lc, call, oldmd, new_md);
					}
					if (md_changed & SAL_MEDIA_DESCRIPTION_CRYPTO_CHANGED) {
						ms_message("Crypto parameters have changed, update them.");
						linphone_call_update_crypto_parameters(call, oldmd, new_md);
					}
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					goto end;
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				}
			}
		}
		linphone_call_stop_media_streams (call);
		linphone_call_init_media_streams (call);
	}
	
	if (new_md) {
		bool_t all_muted=FALSE;
		bool_t send_ringbacktone=FALSE;
		
		if (call->audiostream==NULL){
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			/*this happens after pausing the call locally. The streams are destroyed and then we wait the 200Ok to recreate them*/
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			linphone_call_init_media_streams (call);
		}
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		if (call->state==LinphoneCallIncomingEarlyMedia && linphone_core_get_remote_ringback_tone (lc)!=NULL){
			send_ringbacktone=TRUE;
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		}
		if (call->state==LinphoneCallIncomingEarlyMedia ||
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		    (call->state==LinphoneCallOutgoingEarlyMedia && !call->params.real_early_media)){
			all_muted=TRUE;
		}
		linphone_call_start_media_streams(call,all_muted,send_ringbacktone);
	}
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	if (call->state==LinphoneCallPausing && call->paused_by_app && ms_list_size(lc->calls)==1){
		linphone_core_play_named_tone(lc,LinphoneToneCallOnHold);
	}
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	end:
	if (oldmd) 
		sal_media_description_unref(oldmd);
	
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}
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#if 0
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static bool_t is_duplicate_call(LinphoneCore *lc, const LinphoneAddress *from, const LinphoneAddress *to){
	MSList *elem;
	for(elem=lc->calls;elem!=NULL;elem=elem->next){
		LinphoneCall *call=(LinphoneCall*)elem->data;
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		if (linphone_address_weak_equal(call->log->from,from) &&
		    linphone_address_weak_equal(call->log->to, to)){
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			return TRUE;
		}
	}
	return FALSE;
}
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#endif

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static bool_t already_a_call_with_remote_address(const LinphoneCore *lc, const LinphoneAddress *remote) {
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	MSList *elem;
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	ms_warning(" searching for already_a_call_with_remote_address.");

	for(elem=lc->calls;elem!=NULL;elem=elem->next){
		const LinphoneCall *call=(LinphoneCall*)elem->data;
		const LinphoneAddress *cRemote=linphone_call_get_remote_address(call);
		if (linphone_address_weak_equal(cRemote,remote)) {
			ms_warning("already_a_call_with_remote_address found.");
			return TRUE;
		}
	}
	return FALSE;
}

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static bool_t already_a_call_pending(LinphoneCore *lc){
	MSList *elem;
	for(elem=lc->calls;elem!=NULL;elem=elem->next){
		LinphoneCall *call=(LinphoneCall*)elem->data;
		if (call->state==LinphoneCallIncomingReceived
		    || call->state==LinphoneCallOutgoingInit
		    || call->state==LinphoneCallOutgoingProgress
		    || call->state==LinphoneCallOutgoingEarlyMedia
		    || call->state==LinphoneCallOutgoingRinging){
			return TRUE;
		}
	}
	return FALSE;
}
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static void call_received(SalOp *h){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(h));
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	LinphoneCall *call;
	const char *from,*to;
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	char *alt_contact;
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	LinphoneAddress *from_addr, *to_addr;
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	bool_t prevent_colliding_calls=lp_config_get_int(lc->config,"sip","prevent_colliding_calls",TRUE);
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	/* first check if we can answer successfully to this invite */
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	if (linphone_presence_model_get_basic_status(lc->presence_model) == LinphonePresenceBasicStatusClosed) {
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		LinphonePresenceActivity *activity = linphone_presence_model_get_activity(lc->presence_model);
		switch (linphone_presence_activity_get_type(activity)) {
			case LinphonePresenceActivityBusy:
				sal_call_decline(h,SalReasonBusy,NULL);
				break;
			case LinphonePresenceActivityAppointment:
			case LinphonePresenceActivityMeeting:
			case LinphonePresenceActivityOffline:
			case LinphonePresenceActivityWorship:
				sal_call_decline(h,SalReasonTemporarilyUnavailable,NULL);
				break;
			case LinphonePresenceActivityPermanentAbsence:
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				alt_contact = linphone_presence_model_get_contact(lc->presence_model);
				if (alt_contact != NULL) {
					sal_call_decline(h,SalReasonRedirect,alt_contact);
					ms_free(alt_contact);
				}
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				break;
			default:
				break;
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		}
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		sal_op_release(h);
		return;
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	}
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	if (!linphone_core_can_we_add_call(lc)){/*busy*/
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		sal_call_decline(h,SalReasonBusy,NULL);
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		sal_op_release(h);
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		return;
	}
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	from=sal_op_get_from(h);
	to=sal_op_get_to(h);
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	from_addr=linphone_address_new(from);
	to_addr=linphone_address_new(to);

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	if ((already_a_call_with_remote_address(lc,from_addr) && prevent_colliding_calls) || already_a_call_pending(lc)){
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		ms_warning("Receiving another call while one is ringing or initiated, refusing this one with busy message.");
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		sal_call_decline(h,SalReasonBusy,NULL);
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		sal_op_release(h);
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		linphone_address_destroy(from_addr);
		linphone_address_destroy(to_addr);
		return;
	}
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	call=linphone_call_new_incoming(lc,from_addr,to_addr,h);
	
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	/* the call is acceptable so we can now add it to our list */
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	linphone_core_add_call(lc,call);
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	linphone_call_ref(call); /*prevent the call from being destroyed while we are notifying, if the user declines within the state callback */
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	if ((linphone_core_get_firewall_policy(lc) == LinphonePolicyUseIce) && (call->ice_session != NULL)) {
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		/* Defer ringing until the end of the ICE candidates gathering process. */
		ms_message("Defer ringing to gather ICE candidates");
		return;
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	}
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#ifdef BUILD_UPNP
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	if ((linphone_core_get_firewall_policy(lc) == LinphonePolicyUseUpnp) && (call->upnp_session != NULL)) {
		/* Defer ringing until the end of the ICE candidates gathering process. */
		ms_message("Defer ringing to gather uPnP candidates");
		return;
	}
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#endif //BUILD_UPNP
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	linphone_core_notify_incoming_call(lc,call);
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}

static void call_ringing(SalOp *h){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(h));
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(h);
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	SalMediaDescription *md;
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	if (call==NULL) return;
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	/*set privacy*/
	call->current_params.privacy=(LinphonePrivacyMask)sal_op_get_privacy(call->op);

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	if (lc->vtable.display_status)
		lc->vtable.display_status(lc,_("Remote ringing."));
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	md=sal_call_get_final_media_description(h);
	if (md==NULL){
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		linphone_core_stop_dtmf_stream(lc);
		if (lc->ringstream!=NULL) return;/*already ringing !*/
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		if (lc->sound_conf.play_sndcard!=NULL){
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			MSSndCard *ringcard=lc->sound_conf.lsd_card ? lc->sound_conf.lsd_card : lc->sound_conf.play_sndcard;
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			if (call->localdesc->streams[0].max_rate>0) ms_snd_card_set_preferred_sample_rate(ringcard, call->localdesc->streams[0].max_rate);
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			/*we release sound before playing ringback tone*/
			if (call->audiostream)
				audio_stream_unprepare_sound(call->audiostream);
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			lc->ringstream=ring_start(lc->sound_conf.remote_ring,2000,ringcard);
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		}
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		ms_message("Remote ringing...");
		if (lc->vtable.display_status) 
			lc->vtable.display_status(lc,_("Remote ringing..."));
		linphone_call_set_state(call,LinphoneCallOutgoingRinging,"Remote ringing");
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	}else{
		/*accept early media */
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		if (call->audiostream && audio_stream_started(call->audiostream)){
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			/*streams already started */
			ms_message("Early media already started.");
			return;
		}
		if (lc->vtable.show) lc->vtable.show(lc);
		if (lc->vtable.display_status) 
			lc->vtable.display_status(lc,_("Early media."));
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		linphone_call_set_state(call,LinphoneCallOutgoingEarlyMedia,"Early media");
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		linphone_core_stop_ringing(lc);
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		ms_message("Doing early media...");
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		linphone_core_update_streams(lc,call,md);
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	}
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}

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/*
 * could be reach :
 *  - when the call is accepted
 *  - when a request is accepted (pause, resume)
 */
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static void call_accepted(SalOp *op){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	SalMediaDescription *md;
	
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	if (call==NULL){
		ms_warning("No call to accept.");
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		return ;
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	}
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	/*set privacy*/
	call->current_params.privacy=(LinphonePrivacyMask)sal_op_get_privacy(call->op);
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	/* Handle remote ICE attributes if any. */
	if (call->ice_session != NULL) {
		linphone_core_update_ice_from_remote_media_description(call, sal_call_get_remote_media_description(op));
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	}
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#ifdef BUILD_UPNP
	if (call->upnp_session != NULL) {
		linphone_core_update_upnp_from_remote_media_description(call, sal_call_get_remote_media_description(op));
	}
#endif //BUILD_UPNP
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	md=sal_call_get_final_media_description(op);
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	if (md) /*make sure re-invite will not propose video again*/
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		call->params.has_video &= linphone_core_media_description_contains_video_stream(md);
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	if (call->state==LinphoneCallOutgoingProgress ||
	    call->state==LinphoneCallOutgoingRinging ||
	    call->state==LinphoneCallOutgoingEarlyMedia){
		linphone_call_set_state(call,LinphoneCallConnected,"Connected");
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		if (call->referer) linphone_core_notify_refer_state(lc,call->referer,call);
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	}
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	if (md && !sal_media_description_empty(md) && !linphone_core_incompatible_security(lc,md)){
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		linphone_call_update_remote_session_id_and_ver(call);
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		if (sal_media_description_has_dir(md,SalStreamSendOnly) ||
		    sal_media_description_has_dir(md,SalStreamInactive)){
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			if (lc->vtable.display_status){
				char *tmp=linphone_call_get_remote_address_as_string (call);
				char *msg=ms_strdup_printf(_("Call with %s is paused."),tmp);
				lc->vtable.display_status(lc,msg);
				ms_free(tmp);
				ms_free(msg);
			}
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			linphone_core_update_streams (lc,call,md);
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			linphone_call_set_state(call,LinphoneCallPaused,"Call paused");
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			if (call->refer_pending)
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				linphone_core_start_refered_call(lc,call,NULL);
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		}else if (sal_media_description_has_dir(md,SalStreamRecvOnly)){
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			/*we are put on hold when the call is initially accepted */
			if (lc->vtable.display_status){
				char *tmp=linphone_call_get_remote_address_as_string (call);
				char *msg=ms_strdup_printf(_("Call answered by %s - on hold."),tmp);
				lc->vtable.display_status(lc,msg);
				ms_free(tmp);
				ms_free(msg);
			}
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			linphone_core_update_streams (lc,call,md);
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			linphone_call_set_state(call,LinphoneCallPausedByRemote,"Call paused by remote");
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		}else{
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			if (call->state!=LinphoneCallUpdating){
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				if (call->state==LinphoneCallResuming){
					if (lc->vtable.display_status){
						lc->vtable.display_status(lc,_("Call resumed."));
					}
				}else{
					if (lc->vtable.display_status){
						char *tmp=linphone_call_get_remote_address_as_string (call);
						char *msg=ms_strdup_printf(_("Call answered by %s."),tmp);
						lc->vtable.display_status(lc,msg);
						ms_free(tmp);
						ms_free(msg);
					}
				}
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			}
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			linphone_core_update_streams(lc,call,md);
			/*also reflect the change if the "wished" params, in order to avoid to propose SAVP or video again
			* further in the call, for example during pause,resume, conferencing reINVITEs*/
			linphone_call_fix_call_parameters(call);
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			if (!call->current_params.in_conference)
				lc->current_call=call;
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			linphone_call_set_state(call, LinphoneCallStreamsRunning, "Streams running");
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		}
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	}else{
		/*send a bye*/
		ms_error("Incompatible SDP offer received in 200Ok, need to abort the call");
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		linphone_core_abort_call(lc,call,_("Incompatible, check codecs or security settings..."));
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	}
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}

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static void call_ack(SalOp *op){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	if (call==NULL){
		ms_warning("No call to be ACK'd");
		return ;
	}
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	if (call->media_pending){
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		SalMediaDescription *md=sal_call_get_final_media_description(op);
		if (md && !sal_media_description_empty(md)){
			linphone_core_update_streams (lc,call,md);
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			linphone_call_set_state (call,LinphoneCallStreamsRunning,"Connected (streams running)");
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		}else{
			/*send a bye*/
			ms_error("Incompatible SDP response received in ACK, need to abort the call");
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			linphone_core_abort_call(lc,call,"No codec intersection");
			return;
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		}
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	}
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}

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static void call_accept_update(LinphoneCore *lc, LinphoneCall *call){
	SalMediaDescription *md;
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	SalMediaDescription *rmd=sal_call_get_remote_media_description(call->op);
	if ((rmd!=NULL) && (call->ice_session!=NULL)) {
		linphone_core_update_ice_from_remote_media_description(call,rmd);
		linphone_core_update_local_media_description_from_ice(call->localdesc,call->ice_session);
	}
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#ifdef BUILD_UPNP
	if(call->upnp_session != NULL) {
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		linphone_core_update_upnp_from_remote_media_description(call, rmd);
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		linphone_core_update_local_media_description_from_upnp(call->localdesc,call->upnp_session);
	}
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#endif //BUILD_UPNP
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	linphone_call_update_remote_session_id_and_ver(call);
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	sal_call_accept(call->op);
	md=sal_call_get_final_media_description(call->op);
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	if (md && !sal_media_description_empty(md)){
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		linphone_core_update_streams(lc,call,md);
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	}
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}

static void call_resumed(LinphoneCore *lc, LinphoneCall *call){
	call_accept_update(lc,call);
	if(lc->vtable.display_status)
		lc->vtable.display_status(lc,_("We have been resumed."));
	linphone_call_set_state(call,LinphoneCallStreamsRunning,"Connected (streams running)");
}

static void call_paused_by_remote(LinphoneCore *lc, LinphoneCall *call){
	call_accept_update(lc,call);
	/* we are being paused */
	if(lc->vtable.display_status)
		lc->vtable.display_status(lc,_("We are paused by other party."));
	linphone_call_set_state (call,LinphoneCallPausedByRemote,"Call paused by remote");
}

static void call_updated_by_remote(LinphoneCore *lc, LinphoneCall *call){
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	/*first check if media capabilities are compatible*/
	SalMediaDescription* md;
	linphone_call_make_local_media_description(lc,call);
	sal_call_set_local_media_description(call->op,call->localdesc);
	md=sal_call_get_final_media_description(call->op);
	if (md && (sal_media_description_empty(md) || linphone_core_incompatible_security(lc,md))){
		sal_call_decline(call->op,SalReasonNotAcceptable,NULL);
		return;
	}

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	if(lc->vtable.display_status)
		lc->vtable.display_status(lc,_("Call is updated by remote."));
	call->defer_update=FALSE;
	linphone_call_set_state(call, LinphoneCallUpdatedByRemote,"Call updated by remote");
	if (call->defer_update==FALSE){
		linphone_core_accept_call_update(lc,call,NULL);
	}
}
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/* this callback is called when an incoming re-INVITE modifies the session*/
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static void call_updating(SalOp *op){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	SalMediaDescription *rmd=sal_call_get_remote_media_description(op);
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	if (rmd==NULL){
		/* case of a reINVITE without SDP */
		call_accept_update(lc,call);
		call->media_pending=TRUE;
		return;
	}

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	switch(call->state){
		case LinphoneCallPausedByRemote:
			if (sal_media_description_has_dir(rmd,SalStreamSendRecv) || sal_media_description_has_dir(rmd,SalStreamRecvOnly)){
				call_resumed(lc,call);
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			}else call_paused_by_remote(lc,call);
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		break;
		case LinphoneCallStreamsRunning:
		case LinphoneCallConnected:
			if (sal_media_description_has_dir(rmd,SalStreamSendOnly) || sal_media_description_has_dir(rmd,SalStreamInactive)){
				call_paused_by_remote(lc,call);
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			}else{
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				call_updated_by_remote(lc,call);
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			}
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		break;
		default:
			call_accept_update(lc,call);
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	}
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}

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static void call_terminated(SalOp *op, const char *from){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	if (call==NULL) return;
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	switch(linphone_call_get_state(call)){
		case LinphoneCallEnd:
		case LinphoneCallError:
			ms_warning("call_terminated: ignoring.");
			return;
		break;
		case LinphoneCallIncomingReceived:
		case LinphoneCallIncomingEarlyMedia:
			call->reason=LinphoneReasonNotAnswered;
		break;
		default:
		break;
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	}
	ms_message("Current call terminated...");
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	if (call->refer_pending){
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		linphone_core_start_refered_call(lc,call,NULL);
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	}
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	//we stop the call only if we have this current call or if we are in call
	if (lc->ringstream!=NULL && ( (ms_list_size(lc->calls)  == 1) || linphone_core_in_call(lc) )) {
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		linphone_core_stop_ringing(lc);
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	}
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	linphone_call_stop_media_streams(call);
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	if (lc->vtable.show!=NULL)
		lc->vtable.show(lc);
	if (lc->vtable.display_status!=NULL)
		lc->vtable.display_status(lc,_("Call terminated."));
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#ifdef BUILD_UPNP
	linphone_call_delete_upnp_session(call);
#endif //BUILD_UPNP

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	linphone_call_set_state(call, LinphoneCallEnd,"Call ended");
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}

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static void call_failure(SalOp *op, SalError error, SalReason sr, const char *details, int code){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	char *msg486=_("User is busy.");
	char *msg480=_("User is temporarily unavailable.");
	/*char *retrymsg=_("%s. Retry after %i minute(s).");*/
	char *msg600=_("User does not want to be disturbed.");
	char *msg603=_("Call declined.");
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	const char *msg=details;
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	LinphoneCall *referer=call->referer;
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	if (call==NULL){
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		ms_warning("Call faillure reported on already terminated call.");
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		return ;
	}
	
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	if (lc->vtable.show) lc->vtable.show(lc);

	if (error==SalErrorNoResponse){
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		msg=_("No response.");
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		if (lc->vtable.display_status)
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			lc->vtable.display_status(lc,msg);
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	}else if (error==SalErrorProtocol){
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		msg=details ? details : _("Protocol error.");
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		if (lc->vtable.display_status)
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			lc->vtable.display_status(lc, msg);
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	}else if (error==SalErrorFailure){
		switch(sr){
			case SalReasonDeclined:
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				msg=msg603;
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				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg603);
			break;
			case SalReasonBusy:
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				msg=msg486;
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				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg486);
			break;
			case SalReasonRedirect:
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				msg=_("Redirected");
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				if (lc->vtable.display_status)
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					lc->vtable.display_status(lc,msg);
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			break;
			case SalReasonTemporarilyUnavailable:
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				msg=msg480;
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				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg480);
			break;
			case SalReasonNotFound:
				if (lc->vtable.display_status)
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					lc->vtable.display_status(lc,msg);
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			break;
			case SalReasonDoNotDisturb:
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				msg=msg600;
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				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg600);
			break;
			case SalReasonMedia:
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			//media_encryption_mandatory
				if (call->params.media_encryption == LinphoneMediaEncryptionSRTP && 
					!linphone_core_is_media_encryption_mandatory(lc)) {
					int i;
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					ms_message("Outgoing call [%p] failed with SRTP (SAVP) enabled",call);
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					linphone_call_stop_media_streams(call);
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					if (	call->state==LinphoneCallOutgoingInit
							|| call->state==LinphoneCallOutgoingProgress
							|| call->state==LinphoneCallOutgoingRinging /*push case*/
							|| call->state==LinphoneCallOutgoingEarlyMedia){
						ms_message("Retrying call [%p] with AVP",call);
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						/* clear SRTP local params */
						call->params.media_encryption = LinphoneMediaEncryptionNone;
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						for(i=0; i<call->localdesc->n_active_streams; i++) {
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							call->localdesc->streams[i].proto = SalProtoRtpAvp;
							memset(call->localdesc->streams[i].crypto, 0, sizeof(call->localdesc->streams[i].crypto));
						}
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						linphone_core_restart_invite(lc, call);
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						return;
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					}
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				}
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				msg=_("Incompatible media parameters.");
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				if (lc->vtable.display_status)
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					lc->vtable.display_status(lc,msg);
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			break;
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			case SalReasonRequestPending:
				/*restore previous state, the application will decide to resubmit the action if relevant*/
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				call->reason=linphone_reason_from_sal(sr);
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				linphone_call_set_state(call,call->prevstate,msg);
				return;
			break;
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			default:
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,_("Call failed."));
		}
	}
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	/*some call error are not fatal*/
	switch (call->state) {
	case LinphoneCallUpdating:
	case LinphoneCallPausing:
	case LinphoneCallResuming:
		ms_message("Call error on state [%s], restoring previous state",linphone_call_state_to_string(call->prevstate));
		call->reason=linphone_reason_from_sal(sr);
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		linphone_call_set_state(call, call->prevstate,details);
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		return;
	default:
		break; /*nothing to do*/
	}

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	linphone_core_stop_ringing(lc);
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	linphone_call_stop_media_streams(call);
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#ifdef BUILD_UPNP
	linphone_call_delete_upnp_session(call);
#endif //BUILD_UPNP
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	call->reason=linphone_reason_from_sal(sr);
	if (sr==SalReasonDeclined){
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		linphone_call_set_state(call,LinphoneCallEnd,"Call declined.");
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	}else{
		linphone_call_set_state(call,LinphoneCallError,details);
		if (sr==SalReasonBusy)
			linphone_core_play_named_tone(lc,LinphoneToneBusy);
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	}
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	if (referer){
		/*
		 * 1- resume call automatically if we had to pause it before to execute the transfer
		 * 2- notify other party of the transfer faillure
		 * This must be done at the end because transferer call can't be resumed until transfer-target call is changed to error state.
		 * This must be done in this order because if the notify transaction will prevent the resume transaction to take place.
		 * On the contrary, the notify transaction is queued and then executed after the resume completes.
		**/
		if (linphone_call_get_state(referer)==LinphoneCallPaused && referer->was_automatically_paused){
			/*resume to the call that send us the refer automatically*/
			linphone_core_resume_call(lc,referer);
			referer->was_automatically_paused=FALSE;
		}
		linphone_core_notify_refer_state(lc,referer,call);
	}
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}

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static void call_released(SalOp *op){
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	if (call!=NULL){
		linphone_call_set_state(call,LinphoneCallReleased,"Call released");
	}else ms_error("call_released() for already destroyed call ?");
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}

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static void auth_failure(SalOp *op, SalAuthInfo* info) {
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	LinphoneAuthInfo *ai=(LinphoneAuthInfo*)linphone_core_find_auth_info(lc,info->realm,info->username,info->domain);
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	if (ai){
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		ms_message("%s/%s/%s authentication fails.",info->realm,info->username,info->domain);
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	}
	if (lc->vtable.auth_info_requested) {
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		lc->vtable.auth_info_requested(lc,info->realm,info->username,info->domain);
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	}
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}
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static void register_success(SalOp *op, bool_t registered){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneProxyConfig *cfg=(LinphoneProxyConfig*)sal_op_get_user_pointer(op);
	char *msg;
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	if (!cfg || cfg->deletion_date!=0){
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		ms_message("Registration success for removed proxy config, ignored");
		return;
	}
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	linphone_proxy_config_set_error(cfg,LinphoneReasonNone);
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	linphone_proxy_config_set_state(cfg, registered ? LinphoneRegistrationOk : LinphoneRegistrationCleared ,
	                                registered ? "Registration sucessful" : "Unregistration done");
	if (lc->vtable.display_status){
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		if (registered) msg=ms_strdup_printf(_("Registration on %s successful."),sal_op_get_proxy(op));
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		else msg=ms_strdup_printf(_("Unregistration on %s done."),sal_op_get_proxy(op));
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		lc->vtable.display_status(lc,msg);
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		ms_free(msg);
	}
	
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}

static void register_failure(SalOp *op, SalError error, SalReason reason, const char *details){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	LinphoneProxyConfig *cfg=(LinphoneProxyConfig*)sal_op_get_user_pointer(op);

	if (cfg==NULL){
		ms_warning("Registration failed for unknown proxy config.");
		return ;
	}
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	if (cfg->deletion_date!=0){
		ms_message("Registration failed for removed proxy config, ignored");
		return;
	}
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	if (details==NULL)
		details=_("no response timeout");
	
	if (lc->vtable.display_status) {
		char *msg=ortp_strdup_printf(_("Registration on %s failed: %s"),sal_op_get_proxy(op),details  );
		lc->vtable.display_status(lc,msg);
		ms_free(msg);
	}
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	linphone_proxy_config_set_error(cfg,linphone_reason_from_sal(reason));

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	if (error== SalErrorFailure
			&& reason == SalReasonServiceUnavailable
			&& linphone_proxy_config_get_state(cfg) == LinphoneRegistrationOk) {
		linphone_proxy_config_set_state(cfg,LinphoneRegistrationProgress,_("Service unavailable, retrying"));
	} else {
		linphone_proxy_config_set_state(cfg,LinphoneRegistrationFailed,details);
	}
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	if (cfg->publish_op){
		/*prevent publish to be sent now until registration gets successful*/
		sal_op_release(cfg->publish_op);
		cfg->publish_op=NULL;
		cfg->send_publish=cfg->publish;
	}
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}

static void vfu_request(SalOp *op){
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#ifdef VIDEO_ENABLED
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer (op);
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	if (call==NULL){
		ms_warning("VFU request but no call !");
		return ;
	}
	if (call->videostream)
		video_stream_send_vfu(call->videostream);
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#endif
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}

static void dtmf_received(SalOp *op, char dtmf){
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	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	if (lc->vtable.dtmf_received != NULL)
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		lc->vtable.dtmf_received(lc, call, dtmf);
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}

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static void refer_received(Sal *sal, SalOp *op, const char *referto){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal);
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	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
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	if (call){
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		if (call->refer_to!=NULL){
			ms_free(call->refer_to);
		}
		call->refer_to=ms_strdup(referto);
		call->refer_pending=TRUE;
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		linphone_call_set_state(call,LinphoneCallRefered,"Refered");
		if (lc->vtable.display_status){
			char *msg=ms_strdup_printf(_("We are transferred to %s"),referto);
			lc->vtable.display_status(lc,msg);
			ms_free(msg);
		}
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		if (call->refer_pending) linphone_core_start_refered_call(lc,call,NULL);
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	}else if (lc->vtable.refer_received){
		lc->vtable.refer_received(lc,referto);
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	}
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}

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static bool_t is_duplicate_msg(LinphoneCore *lc, const char *msg_id){
	MSList *elem=lc->last_recv_msg_ids;
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	MSList *tail=NULL;
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	int i;
	bool_t is_duplicate=FALSE;
	for(i=0;elem!=NULL;elem=elem->next,i++){
		if (strcmp((const char*)elem->data,msg_id)==0){
			is_duplicate=TRUE;
		}
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		tail=elem;
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	}
	if (!is_duplicate){
		lc->last_recv_msg_ids=ms_list_prepend(lc->last_recv_msg_ids,ms_strdup(msg_id));
	}
	if (i>=10){
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		ms_free(tail->data);
		lc->last_recv_msg_ids=ms_list_remove_link(lc->last_recv_msg_ids,tail);
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	}
	return is_duplicate;
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}
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static void text_received(SalOp *op, const SalMessage *msg){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
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	if (is_duplicate_msg(lc,msg->message_id)==FALSE){
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		linphone_core_message_received(lc,op,msg);
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	}
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}

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static void parse_presence_requested(SalOp *op, const char *content_type, const char *content_subtype, const char *body, SalPresenceModel