[...Moved to SIP-IMPLEMENTORS...]
vishal wrote:
> Hi ,
>
> It should be possible to receive request sent over UDP and send
> response over TCP because in some cases when UDP message size is greater
> than MTU size ,then message sending will not succeed .
Umm, I think this may not be accurate. Responses follow the Via path;
and if the topmost Via path of a request had a transport of UDP, then
the response will go over UDP as well.
I think -09bis says somewhere that if a UAC knows that the request is
within 200 (or so) bytes of the path MTU if known, or if it is > 1300
bytes and the path MTU is not known, then TCP should be used for the
request.
There was a debate a while ago in the SIP WG list on this very topic;
namely, what to do if the response (because of, say, a forking proxy
aggregates 401/407 responses from multiple branches which leads to
the response being greater than the path MTU). I think the gist of
that was the need for -09bis to say what it does now.
Regards,
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Wireless Networks Group/Internet Software and Services
Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
Naperville, Illinois 60566 Voice: +1 630 224 0216
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