In some specific cases, I need to reject an incoming call without answering it. I do this via a CONGESTION, which sends a 503 Service Unavailable. However, my provider retries the call immediately a number of times.
- does the behaviour of the provider seem normal to you, is that somewhere defined in the rfc ?
- is there a way to send a 480 temporarily unavailable (which is the case), or 603 Decline, or 600 Busy Everywhere ?