Christer
You are right, of course. Often one realizes certain subtleties only during
detailed implementation and does not see them rightaway on reading the spec.
I was simply stating that it is not explicitly stated that the REQ-URI of
the CONTACT in a reliable 1xx be used to send the PRACK. One has to deduce
this from the statement that a CONTACT is mandatory on a reliable 1xx.
Of course, if we do this then the PRACK will bypass the proxy, which is
probably for good (but unstated) reasons that we don't want a stateless
proxy to fork the PRACK, we want the PRACK to be delivered speedily etc.
Further, if we CANCEL the original request, we must not send it to the
Contact, but to the REQ-URI of the original INVITE, right?
Also, if the call is setup and a RE-INVITE is issued directly to the
CONTACT, the UAS must not send a different CONTACT in the 1xx. If it did,
what should the UAC do? Ignore it and continue using the original
CONTACT/terminate the call/ update the CONTACT and direct the PRACK/CANCEL
to the new CONTACT?
----- Original Message -----
From: "Christer Holmberg" <[EMAIL PROTECTED]>
To: "A Venkatraman" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Friday, July 20, 2001 4:47 PM
Subject: Re: [Sip-implementors] Req-URI of PRACK
>
> Hi,
>
> Isn't what you say true for ANY request after the INVITE? Ie, if the
> proxy doesn't record route, it will not receive the next request, no
> matter if it is a PRACK, INFO, BYE.... or whatever.
>
> Or, did I missunderstand your question?
>
> Regards,
>
> Christer Holmberg
> Ericsson Finland
>
>
>
>
>
> A Venkatraman wrote:
> >
> > I would like affirmation (or negation+correction) of my understanding of
how
> > the Req-URI is to be built for a PRACK when the proxy does not add a
Record
> > Route.
> > Since the CONTACT is mandatory on a reliable provisional response, the
PRACK
> > must use the CONTACT to build the REQ-URI.
> > This means that the PRACK will bypass the proxies, since none of them
have
> > record routed.
> > A PROXY THAT DOES NOT RECORD ROUTE DOES NOT EVER SEE A PRACK (unless it
is
> > the default outbound local proxy). Correct?
> >
> > The 100rel draft does not specifically mention this, probably because
this
> > is the only obvious conclusion from the statement in the UAS section
about
> > CONTACT being mandatory on the reliable prov response.
> >
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> >
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