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
--
Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States
Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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