diff --git a/coreapi/account_creator.c b/coreapi/account_creator.c
index 4d18c8663..f9bcff7a3 100644
--- a/coreapi/account_creator.c
+++ b/coreapi/account_creator.c
@@ -122,9 +122,11 @@ LinphoneProxyConfig * linphone_account_creator_create_proxy_config(const Linphon
 	if (creator->display_name) {
 		linphone_address_set_display_name(identity, creator->display_name);
 	}
+	/*deprecated, use default proxy config instead*/
 	if (creator->route) {
 		route = ms_strdup_printf("%s", creator->route);
 	}
+	/*deprecated, use default proxy config instead*/
 	if (creator->domain) {
 		domain = ms_strdup_printf("%s;transport=%s", creator->domain, linphone_transport_to_string(creator->transport));
 	}
@@ -137,12 +139,7 @@ LinphoneProxyConfig * linphone_account_creator_create_proxy_config(const Linphon
 		snprintf(buff, sizeof(buff), "%d", dial_prefix_number);
 		linphone_proxy_config_set_dial_prefix(cfg, buff);
 	}
-	if (linphone_proxy_config_get_server_addr(cfg) == NULL)
-		linphone_proxy_config_set_server_addr(cfg, domain);
-	if (linphone_proxy_config_get_route(cfg) == NULL)
-		linphone_proxy_config_set_route(cfg, route);
 
-	linphone_proxy_config_enable_publish(cfg, FALSE);
 	linphone_proxy_config_enable_register(cfg, TRUE);
 
 	info = linphone_auth_info_new(linphone_address_get_username(identity), // username
diff --git a/coreapi/friend.c b/coreapi/friend.c
index 5ebb7423a..ff47cabff 100644
--- a/coreapi/friend.c
+++ b/coreapi/friend.c
@@ -1160,6 +1160,7 @@ bool_t linphone_friend_create_vcard(LinphoneFriend *fr, const char *name) {
 	}
 	linphone_vcard_set_full_name(vcard, name);
 	linphone_friend_set_vcard(fr, vcard);
+	linphone_vcard_unref(vcard);
 	return TRUE;
 }
 
diff --git a/coreapi/linphonecall.c b/coreapi/linphonecall.c
index 2aa0a76bf..888765c98 100644
--- a/coreapi/linphonecall.c
+++ b/coreapi/linphonecall.c
@@ -1109,6 +1109,20 @@ static void linphone_call_init_common(LinphoneCall *call, LinphoneAddress *from,
 	linphone_call_init_stats(call->audio_stats, LINPHONE_CALL_STATS_AUDIO);
 	linphone_call_init_stats(call->video_stats, LINPHONE_CALL_STATS_VIDEO);
 	linphone_call_init_stats(call->text_stats, LINPHONE_CALL_STATS_TEXT);
+	
+	if (call->dest_proxy == NULL) {
+		/* Try to define the destination proxy if it has not already been done to have a correct contact field in the SIP messages */
+		call->dest_proxy = linphone_core_lookup_known_proxy(call->core, call->log->to);
+	}
+	
+	
+	if (call->dest_proxy != NULL)
+		call->nat_policy = linphone_proxy_config_get_nat_policy(call->dest_proxy);
+	if (call->nat_policy == NULL)
+		call->nat_policy = linphone_core_get_nat_policy(call->core);
+	
+	linphone_nat_policy_ref(call->nat_policy);
+
 }
 
 void linphone_call_init_stats(LinphoneCallStats *stats, int type) {
@@ -1283,7 +1297,7 @@ void linphone_call_fill_media_multicast_addr(LinphoneCall *call) {
 void linphone_call_check_ice_session(LinphoneCall *call, IceRole role, bool_t is_reinvite){
 	if (call->ice_session) return; /*already created*/
 
-	if (!linphone_nat_policy_ice_enabled(linphone_core_get_nat_policy(call->core))){
+	if (!linphone_nat_policy_ice_enabled(call->nat_policy)){
 		return;
 	}
 
@@ -1321,7 +1335,7 @@ LinphoneCall * linphone_call_new_outgoing(struct _LinphoneCore *lc, LinphoneAddr
 
 	linphone_call_check_ice_session(call, IR_Controlling, FALSE);
 
-	if (linphone_core_get_firewall_policy(call->core) == LinphonePolicyUseStun) {
+	if (linphone_nat_policy_ice_enabled(call->nat_policy)) {
 		call->ping_time=linphone_core_run_stun_tests(call->core,call);
 	}
 #ifdef BUILD_UPNP
@@ -1566,8 +1580,6 @@ LinphoneCall * linphone_call_new_incoming(LinphoneCore *lc, LinphoneAddress *fro
 		}
 	}
 
-	if (call->dest_proxy != NULL) nat_policy = linphone_proxy_config_get_nat_policy(call->dest_proxy);
-	if (nat_policy == NULL) nat_policy = linphone_core_get_nat_policy(call->core);
 	if ((nat_policy != NULL) && linphone_nat_policy_ice_enabled(nat_policy)) {
 		/* Create the ice session now if ICE is required */
 		if (md){
@@ -1958,6 +1970,8 @@ static void linphone_call_destroy(LinphoneCall *obj){
 	if (obj->onhold_file) ms_free(obj->onhold_file);
 
 	if (obj->ei) linphone_error_info_unref(obj->ei);
+	if (obj->nat_policy)
+		linphone_nat_policy_unref(obj->nat_policy);
 }
 
 LinphoneCall * linphone_call_ref(LinphoneCall *obj){
@@ -2380,7 +2394,7 @@ static void port_config_set_random_choosed(LinphoneCall *call, int stream_index,
 
 static void _linphone_call_prepare_ice_for_stream(LinphoneCall *call, int stream_index, bool_t create_checklist){
 	MediaStream *ms = stream_index == call->main_audio_stream_index ? (MediaStream*)call->audiostream : stream_index == call->main_video_stream_index ? (MediaStream*)call->videostream : (MediaStream*)call->textstream;
-	if ((linphone_core_get_firewall_policy(call->core) == LinphonePolicyUseIce) && (call->ice_session != NULL)){
+	if (linphone_nat_policy_ice_enabled(call->nat_policy) && (call->ice_session != NULL)){
 		IceCheckList *cl;
 		rtp_session_set_pktinfo(ms->sessions.rtp_session, TRUE);
 		cl=ice_session_check_list(call->ice_session, stream_index);
@@ -2400,7 +2414,7 @@ int linphone_call_prepare_ice(LinphoneCall *call, bool_t incoming_offer){
 	int err;
 	bool_t has_video=FALSE;
 
-	if ((linphone_core_get_firewall_policy(call->core) == LinphonePolicyUseIce) && (call->ice_session != NULL)){
+	if (linphone_nat_policy_ice_enabled(call->nat_policy) && (call->ice_session != NULL)){
 		if (incoming_offer){
 			remote=sal_call_get_remote_media_description(call->op);
 			has_video=linphone_core_video_enabled(call->core) && linphone_core_media_description_contains_video_stream(remote);
@@ -4918,12 +4932,6 @@ static LinphoneAddress *get_fixed_contact(LinphoneCore *lc, LinphoneCall *call ,
 
 void linphone_call_set_contact_op(LinphoneCall* call) {
 	LinphoneAddress *contact;
-
-	if (call->dest_proxy == NULL) {
-		/* Try to define the destination proxy if it has not already been done to have a correct contact field in the SIP messages */
-		call->dest_proxy = linphone_core_lookup_known_proxy(call->core, call->log->to);
-	}
-
 	contact=get_fixed_contact(call->core,call,call->dest_proxy);
 	if (contact){
 		SalTransport tport=sal_address_get_transport((SalAddress*)contact);
diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index 6449b058a..782d9e7d4 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -3164,7 +3164,7 @@ void linphone_core_iterate(LinphoneCore *lc){
 			/*start the call even if the OPTIONS reply did not arrive*/
 			if (call->ice_session != NULL) {
 				ms_warning("ICE candidates gathering from [%s] has not finished yet, proceed with the call without ICE anyway."
-						,linphone_core_get_stun_server(lc));
+						,linphone_nat_policy_get_stun_server(call->nat_policy));
 				linphone_call_delete_ice_session(call);
 				linphone_call_stop_media_streams_for_ice_gathering(call);
 			}
@@ -3517,7 +3517,7 @@ LinphoneCall * linphone_core_invite_address_with_params(LinphoneCore *lc, const
 	call->log->start_date_time=ms_time(NULL);
 	linphone_call_init_media_streams(call);
 
-	if (linphone_core_get_firewall_policy(call->core) == LinphonePolicyUseIce) {
+	if (linphone_nat_policy_ice_enabled(call->nat_policy)) {
 		if (lc->sip_conf.sdp_200_ack){
 			ms_warning("ICE is not supported when sending INVITE without SDP");
 		}else{
diff --git a/coreapi/misc.c b/coreapi/misc.c
index 9f5f216a3..4ad769c9f 100644
--- a/coreapi/misc.c
+++ b/coreapi/misc.c
@@ -517,7 +517,7 @@ static void stun_auth_requested_cb(LinphoneCall *call, const char *realm, const
 	if (nat_policy != NULL) {
 		user = linphone_nat_policy_get_stun_server_username(nat_policy);
 	} else {
-		nat_policy = linphone_core_get_nat_policy(call->core);
+		nat_policy = call->nat_policy;
 		if (nat_policy != NULL) {
 			user = linphone_nat_policy_get_stun_server_username(nat_policy);
 		}
@@ -598,11 +598,9 @@ int linphone_core_gather_ice_candidates(LinphoneCore *lc, LinphoneCall *call){
 	IceCheckList *audio_cl;
 	IceCheckList *video_cl;
 	IceCheckList *text_cl;
-	LinphoneNatPolicy *nat_policy = NULL;
+	LinphoneNatPolicy *nat_policy = call->nat_policy;
 	const char *server = NULL;
 
-	if (call->dest_proxy != NULL) nat_policy = linphone_proxy_config_get_nat_policy(call->dest_proxy);
-	if (nat_policy == NULL) nat_policy = linphone_core_get_nat_policy(lc);
 	if (nat_policy != NULL) server = linphone_nat_policy_get_stun_server(nat_policy);
 
 	if (call->ice_session == NULL) return -1;
diff --git a/coreapi/private.h b/coreapi/private.h
index 14665b01b..8546ca9d4 100644
--- a/coreapi/private.h
+++ b/coreapi/private.h
@@ -400,6 +400,7 @@ struct _LinphoneCall{
 
 	bctbx_list_t *callbacks; /* A list of LinphoneCallCbs object */
 	LinphoneCallCbs *current_cbs; /* The current LinphoneCallCbs object used to call a callback */
+	LinphoneNatPolicy *nat_policy; /*nat policy for this call, either from proxy nor from core*/
 };
 
 BELLE_SIP_DECLARE_VPTR_NO_EXPORT(LinphoneCall);
diff --git a/coreapi/proxy.c b/coreapi/proxy.c
index 03d07e395..09a9cc801 100644
--- a/coreapi/proxy.c
+++ b/coreapi/proxy.c
@@ -1454,7 +1454,10 @@ LinphoneNatPolicy * linphone_proxy_config_get_nat_policy(const LinphoneProxyConf
 }
 
 void linphone_proxy_config_set_nat_policy(LinphoneProxyConfig *cfg, LinphoneNatPolicy *policy) {
-	if (policy != NULL) policy = linphone_nat_policy_ref(policy); /* Prevent object destruction if the same policy is used */
+	if (policy != NULL) {
+		policy = linphone_nat_policy_ref(policy); /* Prevent object destruction if the same policy is used */
+		policy->lc = cfg->lc;
+	}
 	if (cfg->nat_policy != NULL) linphone_nat_policy_unref(cfg->nat_policy);
 	cfg->nat_policy = policy;
 }