Shail Bhatnagar wrote:
>
> > Yes, why won't it? If the proxy forked > 1 branches downstream, it will
> > probably wait until all branches got back to it and assuming none of the
> > branches returned a 200 OK, send the best response upstream.
>
> Then it would forward every 487 that it receives from downstream.
Well, not quite. It will forward one 487 if multiple of them are received.
A proxy forwards multiple 401 and 407 responses, but it should only forward
one 487.
> Are you suggesting that on receiving a CANCEL, the stateful proxy should
> 200 OK this CANCEL and also return a 487 response to INVITE ?
Yes. On receiving a CANCEL from its upstream UAC, the (stateful) proxy
sends a 200 OK (CANCEL), and also propagates the CANCEL to all outstanding
branches. Since a proxy cannot respond to an INVITE on its own, it MUST
wait for the (possibly many) 487 responses and assuming 487 is all it got,
it should send one of these to the UAC.
CANCEL is hop-by-hop (at least for stateful proxies), not end-to-end.
- 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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