give a chance to update contact address during re-INVITEs

coreapi/linphonecore.c

@@ -2887,6 +2887,10 @@ int linphone_core_start_update_call(LinphoneCore *lc, LinphoneCall *call){
 	if (lc->vtable.display_status)
 		lc->vtable.display_status(lc,_("Modifying call parameters..."));
 	sal_call_set_local_media_description (call->op,call->localdesc);
+	if (call->dest_proxy && call->dest_proxy->op && sal_op_get_contact(call->dest_proxy->op)){
+		/*give a chance to update the contact address if connectivity has changed*/
+		sal_op_set_contact(call->op,sal_op_get_contact(call->dest_proxy->op));
+	}
 	return sal_call_update(call->op,subject);
 }