Symptom

When a dial-peer containing session target is shut down the system produces a 503 error (Desired). The issue is that the customer doesn't want to be limited to a specific IP destination so uses server-groups. Somehow when server-group is used on the dial-peer and that is shut down, the response is an immediate 404 error which means their call processing stops.

Conditions

using server-groups instead of session target yields this result. Found in c800-universalk9-mz.SPA.155-3.M *the version info didn't allow me to enter this option

Workaround

response 404 sip-header Warning copy ".*(Session target could not be resolved).*" u04 response 404 sip-header SIP-StatusLine modify "(404 Not Found)" "\1\u04" response 404 sip-header SIP-StatusLine modify "404 Not FoundSession target could not be resolved" "503 Service Unavailable"

Further Problem Description