[VoiceOps] SIP 404 Not Found vs 603 Decline
abalashov at evaristesys.com
Wed Jun 3 15:24:05 EDT 2015
487 is normally expected only for scenarios in which the INVITE
transaction has been terminated due to a CANCEL'd branch. 3261 says:
The request was terminated by a BYE or CANCEL request. This
response is never returned for a CANCEL request itself.
So, it's not an appropriate final negative response to send when not
commanded by a CANCEL. I recommend 503 Service Unavailable.
Alex Balashov | Principal | Evariste Systems LLC
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