Arunachalam Venkatraman wrote:
>
> Since a discussion on delivery of non-200 final response after CANCEL is
> going on, I thought it would be useful to also discuss provisional
> responses.
>
> Question: Should a proxy forward provisional responses to a UAC after it
> receives a CANCEL?
>
> My thinking is that proxy should forward the provisional responses
> although I am working with a proxy that does not.
I would agree that a proxy should forward provisional responses even after
it got a CANCEL and sent a 200 OK (CANCEL). Proxies are not the protocol
police. So long as they get a response that still meshes with the state of
the transaction they are maintaining, they should proxy it.
> Receipt of a CANCEL does not mean the CANCEL will succeed at the UAS. The
> call may already be set up.
> By not delivering the provisional response, some information (attachments
> etc.) will be lost. Further, reliable provisional responses will
> retransmit.
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Internet Software and eServices Group
Lucent Technologies/Bell Labs Innovations 263 Shuman Blvd., Rm 1A-413
Naperville, Illinois 60566 Voice: +1 630 224 0216 Fax: +1 630 713 0184
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