[SIPForum-discussion] Passing several 2xx responses to server transaction

Tomasz Zieleniewski tzieleniewski at gmail.com
Mon May 4 07:23:40 UTC 2009


That means that in case of any non-INVITE request proxy
is responsible for filtering incoming responses and choosing
the best one.
As to INVITE requests there can be many responses due to
request forking. Every such request could potentially
create a separate dialog and session.
Generally in this case proxy as well creates and chooses the best
response but with the exception of 1xx and 2xx which should be forwarded
immediately upstream to UAC.

Kind regards,
- Tomasz Zieleniewski

2009/5/1 Yevgen Krapiva <ykrapiva at gmail.com>

> Hi.
> I need clarification on the following quote from RFC 3261, Response
> processing in statefull proxies:
> >Step 5. Check response for forwarding
> >...
> >This step, combined with the next, ensures that a stateful
> >proxy will forward exactly one final response to a non-INVITE
> >request, and either exactly one non-2xx response or one or more
> >2xx responses to an INVITE request.
> How can I pass several responses over single server transaction ?
> If I pass only one then transaction state will be changed to terminated.
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