fix relay in dispatcher

kamailio/dispatcher-role.cfg

@@ -233,12 +233,8 @@ route[DISPATCHER_NEXT_ROUTE]
         # reset the final reply timer
         $avp(final_reply_timer) = 3;
 
-        t_on_reply("INTERNAL_REPLY");
-
-        t_on_failure("INTERNAL_FAULT");
-
         # relay the request to the new media server
-        route(EXTERNAL_TO_INTERNAL_RELAY);
+        route(RELAY);
 
         exit();
     }