Do not stop ringing if there's still incoming calls

coreapi/linphonecall.c

@@ -5250,6 +5250,8 @@ LinphoneStatus linphone_call_resume(LinphoneCall *call) {
 
 static void terminate_call(LinphoneCall *call) {
 	LinphoneCore *lc = linphone_call_get_core(call);
+	const bctbx_list_t *calls = linphone_core_get_calls(lc);
+	bool_t stop_ringing = true;
 
 	if ((call->state == LinphoneCallIncomingReceived) && (linphone_error_info_get_reason(call->ei) != LinphoneReasonNotAnswered)){
 		linphone_error_info_set_reason(call->ei, LinphoneReasonDeclined);
@@ -5257,7 +5259,16 @@ static void terminate_call(LinphoneCall *call) {
 	}
 
 	/* Stop ringing */
-	linphone_core_stop_ringing(lc);
+	while(calls) {
+		if (((LinphoneCall *)calls->data)->state == LinphoneCallIncomingReceived) {
+			stop_ringing = false;
+			break;
+		}
+		calls = calls->next;
+	}
+	if(stop_ringing) {
+		linphone_core_stop_ringing(lc);
+	}
 	linphone_call_stop_media_streams(call);
 
 #ifdef BUILD_UPNP