callbacks.c

/*
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.
*/


#include "sal.h"

#include "linphonecore.h"
#include "private.h"
#include "mediastreamer2/mediastream.h"
#include "lpconfig.h"

static void register_failure(SalOp *op, SalError error, SalReason reason, const char *details);

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;
	return sal_media_description_equals(oldmd, newmd);
}

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

	for (i = 0; i < old_md->n_active_streams; i++) {
		if (old_md->streams[i].type == SalAudio) {
			old_audiodesc = &old_md->streams[i];
		} else if (old_md->streams[i].type == SalVideo) {
			old_videodesc = &old_md->streams[i];
		}
	}
	for (i = 0; i < new_md->n_active_streams; i++) {
		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);
		rtp_session_set_remote_addr_full(call->audiostream->ms.session, rtp_addr, new_audiodesc->rtp_port, rtcp_addr, new_audiodesc->rtcp_port);
	}
#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);
		rtp_session_set_remote_addr_full(call->videostream->ms.session, rtp_addr, new_videodesc->rtp_port, rtcp_addr, new_videodesc->rtcp_port);
	}
#endif

	/* Copy address and port values from new_md to old_md since we will keep old_md as resultdesc */
	strcpy(old_md->addr, new_md->addr);
	if (old_audiodesc && new_audiodesc) {
		strcpy(old_audiodesc->rtp_addr, new_audiodesc->rtp_addr);
		strcpy(old_audiodesc->rtcp_addr, new_audiodesc->rtcp_addr);
		old_audiodesc->rtp_port = new_audiodesc->rtp_port;
		old_audiodesc->rtcp_port = new_audiodesc->rtcp_port;
	}
	if (old_videodesc && new_videodesc) {
		strcpy(old_videodesc->rtp_addr, new_videodesc->rtp_addr);
		strcpy(old_videodesc->rtcp_addr, new_videodesc->rtcp_addr);
		old_videodesc->rtp_port = new_videodesc->rtp_port;
		old_videodesc->rtcp_port = new_videodesc->rtcp_port;
	}
}

void linphone_core_update_streams(LinphoneCore *lc, LinphoneCall *call, SalMediaDescription *new_md){
	SalMediaDescription *oldmd=call->resultdesc;
	
	if (lc->ringstream!=NULL){
		ring_stop(lc->ringstream);
		lc->ringstream=NULL;
	}
	if (new_md!=NULL){
		sal_media_description_ref(new_md);
		call->media_pending=FALSE;
	}else{
		call->media_pending=TRUE;
	}
	call->resultdesc=new_md;
	if ((call->audiostream && call->audiostream->ms.ticker) || (call->videostream && call->videostream->ms.ticker)){
		/* we already started media: check if we really need to restart it*/
		if (oldmd){
			int md_changed = media_parameters_changed(call, oldmd, new_md);
			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) {
					/*as nothing has changed, keep the oldmd */
					call->resultdesc=oldmd;
					sal_media_description_unref(new_md);
					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)
							linphone_core_mute_mic (lc, linphone_core_is_mic_muted(lc));
#ifdef VIDEO_ENABLED
						if (call->videostream && call->camera_active)
							video_stream_change_camera(call->videostream,lc->video_conf.device );
#endif
					}
					ms_message("No need to restart streams, SDP is unchanged.");
					return;
				}
				else {
					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);
					}
					call->resultdesc = oldmd;
					sal_media_description_unref(new_md);
					return;
				}
			}
		}
		linphone_call_stop_media_streams (call);
		linphone_call_init_media_streams (call);
	}
	if (oldmd) 
		sal_media_description_unref(oldmd);
	
	if (new_md) {
		bool_t all_muted=FALSE;
		bool_t send_ringbacktone=FALSE;
		
		if (call->audiostream==NULL){
			/*this happens after pausing the call locally. The streams are destroyed and then we wait the 200Ok to recreate them*/
			linphone_call_init_media_streams (call);
		}
		if (call->state==LinphoneCallIncomingEarlyMedia && linphone_core_get_remote_ringback_tone (lc)!=NULL){
			send_ringbacktone=TRUE;
		}
		if (call->state==LinphoneCallIncomingEarlyMedia ||
		    (call->state==LinphoneCallOutgoingEarlyMedia && !call->params.real_early_media)){
			all_muted=TRUE;
		}
		linphone_call_start_media_streams(call,all_muted,send_ringbacktone);
	}
	if (call->state==LinphoneCallPausing && call->paused_by_app && ms_list_size(lc->calls)==1){
		linphone_core_play_named_tone(lc,LinphoneToneCallOnHold);
	}
}
#if 0
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;
		if (linphone_address_weak_equal(call->log->from,from) &&
		    linphone_address_weak_equal(call->log->to, to)){
			return TRUE;
		}
	}
	return FALSE;
}
#endif

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

	MSList *elem;
	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;
}

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;
}

static void call_received(SalOp *h){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(h));
	LinphoneCall *call;
	const char *from,*to;
	LinphoneAddress *from_addr, *to_addr;
	bool_t prevent_colliding_calls=lp_config_get_int(lc->config,"sip","prevent_colliding_calls",TRUE);
	
	/* first check if we can answer successfully to this invite */
	if (lc->presence_mode==LinphoneStatusBusy ||
	    lc->presence_mode==LinphoneStatusOffline ||
	    lc->presence_mode==LinphoneStatusDoNotDisturb ||
	    lc->presence_mode==LinphoneStatusMoved){
		if (lc->presence_mode==LinphoneStatusBusy )
			sal_call_decline(h,SalReasonBusy,NULL);
		else if (lc->presence_mode==LinphoneStatusOffline)
			sal_call_decline(h,SalReasonTemporarilyUnavailable,NULL);
		else if (lc->presence_mode==LinphoneStatusDoNotDisturb)
			sal_call_decline(h,SalReasonTemporarilyUnavailable,NULL);
		else if (lc->alt_contact!=NULL && lc->presence_mode==LinphoneStatusMoved)
			sal_call_decline(h,SalReasonRedirect,lc->alt_contact);
		sal_op_release(h);
		return;
	}
	if (!linphone_core_can_we_add_call(lc)){/*busy*/
		sal_call_decline(h,SalReasonBusy,NULL);
		sal_op_release(h);
		return;
	}
	from=sal_op_get_from(h);
	to=sal_op_get_to(h);
	from_addr=linphone_address_new(from);
	to_addr=linphone_address_new(to);

	if ((already_a_call_with_remote_address(lc,from_addr) && prevent_colliding_calls) || already_a_call_pending(lc)){
		ms_warning("Receiving another call while one is ringing or initiated, refusing this one with busy message.");
		sal_call_decline(h,SalReasonBusy,NULL);
		sal_op_release(h);
		linphone_address_destroy(from_addr);
		linphone_address_destroy(to_addr);
		return;
	}
	
	call=linphone_call_new_incoming(lc,from_addr,to_addr,h);
	
	/* the call is acceptable so we can now add it to our list */
	linphone_core_add_call(lc,call);
	linphone_call_ref(call); /*prevent the call from being destroyed while we are notifying, if the user declines within the state callback */

	if ((linphone_core_get_firewall_policy(lc) == LinphonePolicyUseIce) && (call->ice_session != NULL)) {
		/* Defer ringing until the end of the ICE candidates gathering process. */
		ms_message("Defer ringing to gather ICE candidates");
		return;
	}
#ifdef BUILD_UPNP
	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;
	}
#endif //BUILD_UPNP

	linphone_core_notify_incoming_call(lc,call);
}

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

/*
 * could be reach :
 *  - when the call is accepted
 *  - when a request is accepted (pause, resume)
 */
static void call_accepted(SalOp *op){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
	SalMediaDescription *md;
	
	if (call==NULL){
		ms_warning("No call to accept.");
		return ;
	}

	/* 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));
	}
#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

	md=sal_call_get_final_media_description(op);
	call->params.has_video &= linphone_core_media_description_contains_video_stream(md);
	
	if (call->state==LinphoneCallOutgoingProgress ||
	    call->state==LinphoneCallOutgoingRinging ||
	    call->state==LinphoneCallOutgoingEarlyMedia){
		linphone_call_set_state(call,LinphoneCallConnected,"Connected");
		if (call->referer) linphone_core_notify_refer_state(lc,call->referer,call);
	}
	if (md && !sal_media_description_empty(md) && !linphone_core_incompatible_security(lc,md)){
		linphone_call_update_remote_session_id_and_ver(call);
		if (sal_media_description_has_dir(md,SalStreamSendOnly) ||
		    sal_media_description_has_dir(md,SalStreamInactive)){
			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);
			}
			linphone_core_update_streams (lc,call,md);
			linphone_call_set_state(call,LinphoneCallPaused,"Call paused");
			if (call->refer_pending)
				linphone_core_start_refered_call(lc,call);
		}else if (sal_media_description_has_dir(md,SalStreamRecvOnly)){
			/*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);
			}
			linphone_core_update_streams (lc,call,md);
			linphone_call_set_state(call,LinphoneCallPausedByRemote,"Call paused by remote");
		}else{
			if (call->state!=LinphoneCallUpdating){
				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);
					}
				}
			}
			linphone_core_update_streams (lc,call,md);
			if (!call->current_params.in_conference)
				lc->current_call=call;
			linphone_call_set_state(call, LinphoneCallStreamsRunning, "Streams running");
		}
	}else{
		/*send a bye*/
		ms_error("Incompatible SDP offer received in 200Ok, need to abort the call");
		linphone_core_abort_call(lc,call,_("Incompatible, check codecs or security settings..."));
	}
}

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

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

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)");
	linphone_call_set_transfer_state(call, LinphoneCallIdle);
}

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){
	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);
	}
}

/* this callback is called when an incoming re-INVITE modifies the session*/
static void call_updating(SalOp *op){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
	SalMediaDescription *rmd=sal_call_get_remote_media_description(op);

	if (rmd==NULL){
		/* case of a reINVITE without SDP */
		call_accept_update(lc,call);
		call->media_pending=TRUE;
		return;
	}

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

static void call_terminated(SalOp *op, const char *from){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);

	if (call==NULL) return;
	
	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;
	}
	ms_message("Current call terminated...");
	//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) )) {
		ring_stop(lc->ringstream);
		lc->ringstream=NULL;
	}
	linphone_call_stop_media_streams(call);
	if (lc->vtable.show!=NULL)
		lc->vtable.show(lc);
	if (lc->vtable.display_status!=NULL)
		lc->vtable.display_status(lc,_("Call terminated."));

#ifdef BUILD_UPNP
	linphone_call_delete_upnp_session(call);
#endif //BUILD_UPNP

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

static void call_failure(SalOp *op, SalError error, SalReason sr, const char *details, int code){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	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.");
	const char *msg=details;
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);

	if (call==NULL){
		ms_warning("Call faillure reported on already cleaned call ?");
		return ;
	}
	
	if (lc->vtable.show) lc->vtable.show(lc);

	if (error==SalErrorNoResponse){
		msg=_("No response.");
		if (lc->vtable.display_status)
			lc->vtable.display_status(lc,msg);
	}else if (error==SalErrorProtocol){
		msg=details ? details : _("Protocol error.");
		if (lc->vtable.display_status)
			lc->vtable.display_status(lc, msg);
	}else if (error==SalErrorFailure){
		switch(sr){
			case SalReasonDeclined:
				msg=msg603;
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg603);
			break;
			case SalReasonBusy:
				msg=msg486;
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg486);
			break;
			case SalReasonRedirect:
				msg=_("Redirected");
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg);
			break;
			case SalReasonTemporarilyUnavailable:
				msg=msg480;
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg480);
			break;
			case SalReasonNotFound:
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg);
			break;
			case SalReasonDoNotDisturb:
				msg=msg600;
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg600);
			break;
			case SalReasonMedia:
			//media_encryption_mandatory
				if (call->params.media_encryption == LinphoneMediaEncryptionSRTP && 
					!linphone_core_is_media_encryption_mandatory(lc)) {
					int i;
					ms_message("Outgoing call failed with SRTP (SAVP) enabled - retrying with AVP");
					linphone_call_stop_media_streams(call);
					if (call->state==LinphoneCallOutgoingInit || call->state==LinphoneCallOutgoingProgress){
						/* clear SRTP local params */
						call->params.media_encryption = LinphoneMediaEncryptionNone;
						for(i=0; i<call->localdesc->n_active_streams; i++) {
							call->localdesc->streams[i].proto = SalProtoRtpAvp;
							memset(call->localdesc->streams[i].crypto, 0, sizeof(call->localdesc->streams[i].crypto));
						}
						linphone_core_start_invite(lc, call);
					}
					return;
				}
				msg=_("Incompatible media parameters.");
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,msg);
			break;
			default:
				if (lc->vtable.display_status)
					lc->vtable.display_status(lc,_("Call failed."));
		}
	}

	if (lc->ringstream!=NULL) {
		ring_stop(lc->ringstream);
		lc->ringstream=NULL;
	}
	linphone_call_stop_media_streams (call);
	if (call->referer && linphone_call_get_state(call->referer)==LinphoneCallPaused && call->referer->was_automatically_paused){
		/*resume to the call that send us the refer automatically*/
		linphone_core_resume_call(lc,call->referer);
	}

#ifdef BUILD_UPNP
	linphone_call_delete_upnp_session(call);
#endif //BUILD_UPNP

	if (sr == SalReasonDeclined) {
		call->reason=LinphoneReasonDeclined;
		linphone_call_set_state(call,LinphoneCallEnd,"Call declined.");
	} else if (sr == SalReasonNotFound) {
		call->reason=LinphoneReasonNotFound;
		linphone_call_set_state(call,LinphoneCallError,"User not found.");
	} else if (sr == SalReasonBusy) {
		call->reason=LinphoneReasonBusy;
		linphone_call_set_state(call,LinphoneCallError,"User is busy.");
		linphone_core_play_named_tone(lc,LinphoneToneBusy);
	} else {
		linphone_call_set_state(call,LinphoneCallError,msg);
	}
}

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

static void auth_requested(SalOp *h, const char *realm, const char *username){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(h));
	LinphoneAuthInfo *ai=(LinphoneAuthInfo*)linphone_core_find_auth_info(lc,realm,username);
	LinphoneCall *call=is_a_linphone_call(sal_op_get_user_pointer(h));

	if (call && call->ping_op==h){
		/*don't request authentication for ping requests. Their purpose is just to get any
		 * answer to get the Via's received and rport parameters.
		 */
		ms_message("auth_requested(): ignored for ping request.");
		return;
	}
	
	ms_message("auth_requested() for realm=%s, username=%s",realm,username);

	if (ai && ai->works==FALSE && ai->usecount>=3){
		/*case we tried 3 times to authenticate, without success */
		/*Better is to stop (implemeted below in else statement), and retry later*/
		if (ms_time(NULL)-ai->last_use_time>30){
			ai->usecount=0; /*so that we can allow to retry */
		}
	}
	
	if (ai && (ai->works || ai->usecount<3)){
		SalAuthInfo sai;
		sai.username=ai->username;
		sai.userid=ai->userid;
		sai.realm=ai->realm;
		sai.password=ai->passwd;
		ms_message("auth_requested(): authenticating realm=%s, username=%s",realm,username);
		sal_op_authenticate(h,&sai);
		ai->usecount++;
		ai->last_use_time=ms_time(NULL);
	}else{
		if (ai && ai->works==FALSE) {
			sal_op_cancel_authentication(h);
		} 
		if (lc->vtable.auth_info_requested)
			lc->vtable.auth_info_requested(lc,realm,username);
	}
}

static void auth_success(SalOp *h, const char *realm, const char *username){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(h));
	LinphoneAuthInfo *ai=(LinphoneAuthInfo*)linphone_core_find_auth_info(lc,realm,username);
	if (ai){
		ms_message("%s/%s authentication works.",realm,username);
		ai->works=TRUE;
	}
}

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

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

	if (cfg==NULL){
		ms_warning("Registration failed for unknown proxy config.");
		return ;
	}
	if (cfg->deletion_date!=0){
		ms_message("Registration failed for removed proxy config, ignored");
		return;
	}
	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);
	}
	if (error== SalErrorFailure && reason == SalReasonForbidden) {
		linphone_proxy_config_set_error(cfg, LinphoneReasonBadCredentials);
	} else if (error == SalErrorNoResponse) {
		linphone_proxy_config_set_error(cfg, LinphoneReasonNoResponse);
	}
	linphone_proxy_config_set_state(cfg,LinphoneRegistrationFailed,details);
	if (error== SalErrorFailure && reason == SalReasonForbidden) {
		const char *realm=NULL,*username=NULL;
		if (sal_op_get_auth_requested(op,&realm,&username)==0){
			if (lc->vtable.auth_info_requested)
				lc->vtable.auth_info_requested(lc,realm,username);
		}
	}
}

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

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

static void refer_received(Sal *sal, SalOp *op, const char *referto){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal);
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
	if (call){
		if (call->refer_to!=NULL){
			ms_free(call->refer_to);
		}
		call->refer_to=ms_strdup(referto);
		call->refer_pending=TRUE;
		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);
		}
		if (call->state!=LinphoneCallPaused){
			ms_message("Automatically pausing current call to accept transfer.");
			_linphone_core_pause_call(lc,call);
			call->was_automatically_paused=TRUE;
			/*then we will start the refered when the pause is accepted, in order to serialize transactions within the dialog.
			 * Indeed we need to avoid to send a NOTIFY to inform about of state of the refered call while the pause isn't completed.
			**/
		}else linphone_core_start_refered_call(lc,call);
	}else if (lc->vtable.refer_received){
		lc->vtable.refer_received(lc,referto);
	}
}

static bool_t is_duplicate_msg(LinphoneCore *lc, const char *msg_id){
	MSList *elem=lc->last_recv_msg_ids;
	MSList *tail=NULL;
	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;
		}
		tail=elem;
	}
	if (!is_duplicate){
		lc->last_recv_msg_ids=ms_list_prepend(lc->last_recv_msg_ids,ms_strdup(msg_id));
	}
	if (i>=10){
		ms_free(tail->data);
		lc->last_recv_msg_ids=ms_list_remove_link(lc->last_recv_msg_ids,tail);
	}
	return is_duplicate;
}


static void text_received(SalOp *op, const SalMessage *msg){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	if (is_duplicate_msg(lc,msg->message_id)==FALSE){
		linphone_core_message_received(lc,op,msg);
	}
}

static void notify(SalOp *op, const char *from, const char *msg){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer (op);
	ms_message("get a %s notify from %s",msg,from);
	if(lc->vtable.notify_recv)
		lc->vtable.notify_recv(lc,call,from,msg);
}

static void notify_presence(SalOp *op, SalSubscribeStatus ss, SalPresenceStatus status, const char *msg){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	linphone_notify_recv(lc,op,ss,status);
}

static void subscribe_received(SalOp *op, const char *from){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	linphone_subscription_new(lc,op,from);
}

static void subscribe_closed(SalOp *op, const char *from){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	linphone_subscription_closed(lc,op);
}

static void ping_reply(SalOp *op){
	LinphoneCall *call=(LinphoneCall*) sal_op_get_user_pointer(op);
	ms_message("ping reply !");
	if (call){
		if (call->state==LinphoneCallOutgoingInit){
			call->ping_replied=TRUE;
			linphone_core_proceed_with_invite_if_ready(call->core,call,NULL);
		}
	}
	else
	{
		ms_warning("ping reply without call attached...");
	}
}

static void notify_refer(SalOp *op, SalReferStatus status){
	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
	LinphoneCall *call=(LinphoneCall*) sal_op_get_user_pointer(op);
	LinphoneCallState cstate;
	if (call==NULL) {
		ms_warning("Receiving notify_refer for unknown call.");
		return ;
	}
	switch(status){
		case SalReferTrying:
			cstate=LinphoneCallOutgoingProgress;
		break;
		case SalReferSuccess:
			cstate=LinphoneCallConnected;
		break;
		case SalReferFailed:
			cstate=LinphoneCallError;
		break;
		default:
			cstate=LinphoneCallError;
	}
	linphone_call_set_transfer_state(call, cstate);
	if (cstate==LinphoneCallConnected){
		/*automatically terminate the call as the transfer is complete.*/
		linphone_core_terminate_call(lc,call);
	}
}

static LinphoneChatMessageState chatStatusSal2Linphone(SalTextDeliveryStatus status){
	switch(status){
		case SalTextDeliveryInProgress:
			return LinphoneChatMessageStateInProgress;
		case SalTextDeliveryDone:
			return LinphoneChatMessageStateDelivered;
		case SalTextDeliveryFailed:
			return LinphoneChatMessageStateNotDelivered;
	}
	return LinphoneChatMessageStateIdle;
}

static int op_equals(LinphoneCall *a, SalOp *b) {
	return a->op !=b; /*return 0 if equals*/
}
static void text_delivery_update(SalOp *op, SalTextDeliveryStatus status){
	LinphoneChatMessage *chat_msg=(LinphoneChatMessage* )sal_op_get_user_pointer(op);
	const MSList* calls = linphone_core_get_calls(chat_msg->chat_room->lc);
	
	chat_msg->state=chatStatusSal2Linphone(status);
	linphone_chat_message_store_state(chat_msg);
	if (chat_msg && chat_msg->cb) {
		chat_msg->cb(chat_msg
			,chat_msg->state
			,chat_msg->cb_ud);
	}
	linphone_chat_message_destroy(chat_msg);
	
	if (!ms_list_find_custom((MSList*)calls, (MSCompareFunc) op_equals, op)) {
		/*op was only create for messaging purpose, destroying*/
		sal_op_release(op);
	}
}

SalCallbacks linphone_sal_callbacks={
	call_received,
	call_ringing,
	call_accepted,
	call_ack,
	call_updating,
	call_terminated,
	call_failure,
	call_released,
	auth_requested,
	auth_success,
	register_success,
	register_failure,
	vfu_request,
	dtmf_received,
	refer_received,
	text_received,
	text_delivery_update,
	notify,
	notify_presence,
	notify_refer,
	subscribe_received,
	subscribe_closed,
	ping_reply,
};