diff --git a/README.macos.md b/README.macos.md
index 4028bb40a..20660a5a0 100644
--- a/README.macos.md
+++ b/README.macos.md
@@ -5,8 +5,7 @@
 * Xcode (download from apple or using appstore application)
 * [Java SE](http://www.oracle.com/technetwork/java/javase/downloads/index.html) or openJDK
  This is required to generate a C sourcefile from SIP grammar using [antlr3](http://www.antlr3.org/) generator.
- * [HomeBrew](http://brew.sh) or [Macports](http://www.macports.org/).
- * [XQuartz](https://xquartz.macosforge.org) for GTK version.
+* [HomeBrew](http://brew.sh) or [Macports](http://www.macports.org/).
 
 ### Dependencies
 
diff --git a/coreapi/bellesip_sal/sal_impl.c b/coreapi/bellesip_sal/sal_impl.c
index 84964ecf1..3b3c24955 100644
--- a/coreapi/bellesip_sal/sal_impl.c
+++ b/coreapi/bellesip_sal/sal_impl.c
@@ -1135,6 +1135,16 @@ void sal_cancel_timer(Sal *sal, belle_sip_source_t *timer) {
 	belle_sip_main_loop_t *ml = belle_sip_stack_get_main_loop(sal->stack);
 	belle_sip_main_loop_remove_source(ml, timer);
 }
+
+unsigned long sal_begin_background_task(const char *name, void (*max_time_reached)(void *), void *data){
+	return belle_sip_begin_background_task(name, max_time_reached, data);
+}
+
+void sal_end_background_task(unsigned long id){
+	belle_sip_end_background_task(id);
+}
+
+
 void sal_enable_sip_update_method(Sal *ctx,bool_t value) {
 	ctx->enable_sip_update=value;
 }
diff --git a/coreapi/callbacks.c b/coreapi/callbacks.c
index 3eacb34ea..47032e22e 100644
--- a/coreapi/callbacks.c
+++ b/coreapi/callbacks.c
@@ -336,6 +336,8 @@ static void call_received(SalOp *h){
 	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 */
 
+	call->bg_task_id=sal_begin_background_task("liblinphone call notification", NULL, NULL);
+	
 	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");
diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index 537ff51d9..923731619 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -3292,6 +3292,12 @@ void linphone_core_notify_incoming_call(LinphoneCore *lc, LinphoneCall *call){
 	}
 
 	linphone_call_set_state(call,LinphoneCallIncomingReceived,"Incoming call");
+	/*from now on, the application is aware of the call and supposed to take background task or already submitted notification to the user.
+	We can then drop our background task.*/
+	if (call->bg_task_id!=0) {
+		sal_end_background_task(call->bg_task_id);
+		call->bg_task_id=0;
+	}
 
 	if (call->state==LinphoneCallIncomingReceived){
 		/*try to be best-effort in giving real local or routable contact address for 100Rel case*/
diff --git a/coreapi/private.h b/coreapi/private.h
index 56ddf2dc8..36fc09b1b 100644
--- a/coreapi/private.h
+++ b/coreapi/private.h
@@ -257,6 +257,7 @@ struct _LinphoneCall{
 	LinphoneCall *transfer_target;/*if this call received a transfer request, then transfer_target points to the new call created to the refer target */
 	int localdesc_changed;/*not a boolean, contains a mask representing changes*/
 	LinphonePlayer *player;
+	unsigned long bg_task_id; /*used to prevent device to suspend app while a call is received in background*/
 
 	char *dtmf_sequence; /*DTMF sequence needed to be sent using #dtmfs_timer*/
 	belle_sip_source_t *dtmfs_timer; /*DTMF timer needed to send a DTMF sequence*/
diff --git a/gtk/logging.c b/gtk/logging.c
index 26027251f..c5eb883c0 100644
--- a/gtk/logging.c
+++ b/gtk/logging.c
@@ -164,7 +164,6 @@ static FILE *linphone_gtk_log_init()
 
 static void linphone_gtk_log_file(OrtpLogLevel lev, const char *msg)
 {
-	time_t now;
 	FILE *outlog;
 
 	outlog = linphone_gtk_log_init();
@@ -176,12 +175,11 @@ static void linphone_gtk_log_file(OrtpLogLevel lev, const char *msg)
 		 logfile_date_format in the GtkUi section of the config file,
 		 but it defaults to something compact, but yet readable. */
 		const char *lname="undef";
-		char date[256];
 
 		/* Convert level constant to text */
 		switch(lev){
 			case ORTP_DEBUG:
-				lname="debug";
+				lname="debug  ";
 				break;
 			case ORTP_MESSAGE:
 				lname="message";
@@ -190,23 +188,16 @@ static void linphone_gtk_log_file(OrtpLogLevel lev, const char *msg)
 				lname="warning";
 				break;
 			case ORTP_ERROR:
-				lname="error";
+				lname="error  ";
 				break;
 			case ORTP_FATAL:
-				lname="fatal";
+				lname="fatal  ";
 				break;
 			default:
-				lname="undef";
+				lname="undef  ";
 				break;
 		}
-		/* Get current time and format it properly */
-		now = time(NULL);
-		strftime(date, sizeof(date), dateformat, localtime(&now));
-		/* Now print out the message to the logfile.  We don't flush,
-		 maybe we should do to ensure that we have all the messages in
-		 case of a crash (which is one of the main reasons we have a
-		     log facility in the first place). */
-		fprintf(outlog, "[%s] [%s] %s\n", date, lname, msg);
+		fprintf(outlog, "[%s] %s\n", lname, msg);
 		fflush(outlog);
 	}
 }
@@ -335,13 +326,24 @@ gboolean linphone_gtk_check_logs(){
  * Called from any linphone thread.
  */
 void linphone_gtk_log_push(OrtpLogLevel lev, const char *fmt, va_list args){
-	gchar *msg=g_strdup_vprintf(fmt,args);
 	LinphoneGtkLog *lgl=g_new(LinphoneGtkLog,1);
+	gchar *msg=g_strdup_vprintf(fmt,args);
+	gchar *dated_msg;
+	struct timeval tp;
+	struct tm *lt;
+	time_t tt;
+	
+	ortp_gettimeofday(&tp, NULL);
+	tt = (time_t)tp.tv_sec;
+	lt = localtime((const time_t*)&tt);
+	dated_msg=g_strdup_printf("%i-%.2i-%.2i %.2i:%.2i:%.2i:%.3i %s",
+		1900 + lt->tm_year, lt->tm_mon + 1, lt->tm_mday, lt->tm_hour, lt->tm_min, lt->tm_sec, (int)(tp.tv_usec / 1000), msg);
+	g_free(msg);
 	lgl->lev=lev;
-	lgl->msg=msg;
+	lgl->msg=dated_msg;
+	linphone_gtk_log_file(lev, dated_msg);
 	g_static_mutex_lock(&log_mutex);
 	log_queue=g_list_append(log_queue,lgl);
-	linphone_gtk_log_file(lev, msg);
 	g_static_mutex_unlock(&log_mutex);
 }
 
diff --git a/include/sal/sal.h b/include/sal/sal.h
index 666671674..4eedb23ab 100644
--- a/include/sal/sal.h
+++ b/include/sal/sal.h
@@ -811,4 +811,10 @@ int sal_lines_get_value(const char *data, const char *key, char *value, size_t v
 
 belle_sip_stack_t *sal_get_belle_sip_stack(Sal *sal);
 char* sal_op_get_public_uri(SalOp *sal);
+
+unsigned long sal_begin_background_task(const char *name, void (*max_time_reached)(void *), void *data); 
+void sal_end_background_task(unsigned long id);
+
 #endif
+
+