Hello, In our dialplan we are using an external service to to handle calls. So our dialplan looks like: <extension name="dialplanserver"> <condition field="destination_number" expression="^(\\+\d{5,20})$"> <action application="info"/> <action application="socket" data="192.168.1.23:8040 async full"/> </condition> </extension> In the case the external service which is posted by the socket application is down, I can see a "Socket Error!“ error message in the log. The call ends with 480 - "Temporarily Unavailable". ... [ERR] mod_event_socket.c:454 Socket Error! ... [DEBUG] mod_sofia.c:549 Responding to INVITE with: 480 ... Is it somehow possible to force hangup cause 503 - "Service Unavailable" instead of 480 - "Temporarily Unavailable" in case of a Socket Error? Thanks and regards Markus