diff --git a/linphone/coreapi/exevents.c b/linphone/coreapi/exevents.c
index 12a4475..0cd7b43 100644
--- a/linphone/coreapi/exevents.c
+++ b/linphone/coreapi/exevents.c
@@ -932,9 +932,8 @@ void linphone_registration_faillure(LinphoneCore *lc, eXosip_event_t *ev){
 	const char *reason=NULL;
 	osip_uri_t *requri=osip_message_get_uri(ev->request);
 	char *ru;
+	LinphoneProxyConfig *cfg;
 	
-	osip_uri_to_str(requri,&ru);
-
 	if (ev->response){
 		status_code=osip_message_get_status_code(ev->response);
 		reason=osip_message_get_reason_phrase(ev->response);
@@ -945,14 +944,21 @@ void linphone_registration_faillure(LinphoneCore *lc, eXosip_event_t *ev){
 			linphone_process_authentication(lc,ev);
 			break;
 		case 403:
-			linphone_proxy_config_process_authentication_failure(lc,ev);
+			cfg=linphone_core_get_proxy_config_from_rid(lc,ev->rid);
+			/* if contact is up to date, process the failure, otherwise resend a new register with
+				updated contact first, just in case the faillure is due to incorrect contact */
+			if (!linphone_proxy_config_register_again_with_updated_contact(cfg,ev->request,ev->response)){
+				linphone_proxy_config_process_authentication_failure(lc,ev);
+				return;
+			}
 		default:
+			osip_uri_to_str(requri,&ru);
 			msg=ortp_strdup_printf(_("Registration on %s failed: %s"),ru,(reason!=NULL) ? reason : _("no response timeout"));
 			lc->vtable.display_status(lc,msg);
 			gstate_new_state(lc, GSTATE_REG_FAILED, msg);
 			ms_free(msg);
+			osip_free(ru);
 	}
-	osip_free(ru);
 }
 
 void linphone_registration_success(LinphoneCore *lc,eXosip_event_t *ev){
diff --git a/linphone/coreapi/private.h b/linphone/coreapi/private.h
index 325d103..dd34975 100644
--- a/linphone/coreapi/private.h
+++ b/linphone/coreapi/private.h
@@ -32,10 +32,6 @@
 #include "config.h"
 #endif
 
-#ifndef LINPHONE_VERSION
-#define LINPHONE_VERSION "3.1.2"
-#endif
-
 #ifndef LIBLINPHONE_VERSION 
 #define LIBLINPHONE_VERSION LINPHONE_VERSION
 #endif
@@ -112,7 +108,7 @@ static inline void set_string(char **dest, const char *src){
 }
 
 #define PAYLOAD_TYPE_ENABLED	PAYLOAD_TYPE_USER_FLAG_0
-void linphone_proxy_config_register_again_with_updated_contact(LinphoneProxyConfig *obj, osip_message_t *orig_request, osip_message_t *last_answer);
+bool_t linphone_proxy_config_register_again_with_updated_contact(LinphoneProxyConfig *obj, osip_message_t *orig_request, osip_message_t *last_answer);
 void linphone_process_authentication(LinphoneCore* lc, eXosip_event_t *ev);
 void linphone_authentication_ok(LinphoneCore *lc, eXosip_event_t *ev);
 void linphone_subscription_new(LinphoneCore *lc, eXosip_event_t *ev);
diff --git a/linphone/coreapi/proxy.c b/linphone/coreapi/proxy.c
index 9ea5968..bdd10e6 100644
--- a/linphone/coreapi/proxy.c
+++ b/linphone/coreapi/proxy.c
@@ -60,25 +60,25 @@ bool_t linphone_proxy_config_is_registered(const LinphoneProxyConfig *obj){
 	return obj->registered;
 }
 
-void linphone_proxy_config_register_again_with_updated_contact(LinphoneProxyConfig *obj, osip_message_t *orig_request, osip_message_t *last_answer){
+bool_t linphone_proxy_config_register_again_with_updated_contact(LinphoneProxyConfig *obj, osip_message_t *orig_request, osip_message_t *last_answer){
 	osip_message_t *msg;
 	const char *rport,*received;
 	osip_via_t *via=NULL;
 	osip_generic_param_t *param=NULL;
 	osip_contact_t *ctt=NULL;
 	osip_message_get_via(last_answer,0,&via);
-	if (!via) return;
+	if (!via) return FALSE;
 	osip_via_param_get_byname(via,"rport",&param);
 	if (param) rport=param->gvalue;
-	else return;
+	else return FALSE;
 	param=NULL;
 	osip_via_param_get_byname(via,"received",&param);
 	if (param) received=param->gvalue;
-	else return;
+	else return FALSE;
 	osip_message_get_contact(orig_request,0,&ctt);
 	if (strcmp(ctt->url->host,received)==0 && (ctt->url->port!=0 && strcmp(ctt->url->port,rport)==0)){
 		ms_message("Register has up to date contact, doing nothing.");
-		return;
+		return FALSE;
 	}
 	eXosip_lock();
 	msg=NULL;
@@ -95,6 +95,7 @@ void linphone_proxy_config_register_again_with_updated_contact(LinphoneProxyConf
 	eXosip_register_send_register(obj->rid,msg);
 	eXosip_unlock();
 	ms_message("Resending new register with updated contact %s:%s",received,rport);
+	return TRUE;
 }
 
 int linphone_proxy_config_set_server_addr(LinphoneProxyConfig *obj, const char *server_addr){