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Open Issue: 409 Result Code
487 Reserved for Response to CANCEL
Virtual CANCEL idea didn’t fly
Would 480 Be Better?
Looks like out of resource, but
Distinct from 503
Only Issue for annc
Proposal: New Result Code
409 REQUEST REJECTED
The UAS has, for whatever reason, rejected the request. Use cases for this result code include the user at the UAS explicitly rejecting the request (e.g., releasing the call before answering) or to terminate a session that occurs before the session is fully established.
PPT Version