Brett,
Could you please clarify why an unreliable provisional response doesn't
complete an offer/answer? IMO, when a UAC send an offer on the Invite, the
SDP included in the first provisional response closes the offer/answer
exchange, regardless it is reliable or not. The UAS, of course, cannot be
sure the UAC received the answer, so probably it might reject an UPDATE with
SDP, but it depends on the whole message flow. For instance, in the simplest
case where it sends a single 18x with SDP, the simple fact that it receives
the UPDATE means that the UAC had received the unreliable response.
Andrea
------------------------------
Message: 2
Date: Thu, 30 Oct 2008 12:09:29 -0400
From: "Brett Tate" <[EMAIL PROTECTED]>
Subject: Re: [Sip-implementors] Clarification Question on UPDATE
RFC3311
To: "Romel Khan" <[EMAIL PROTECTED]>,
<sip-implementors@lists.cs.columbia.edu>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset="us-ascii"
UPDATE is allowed; however it might fail if there are offer/answer
issues. More specifically a non reliable 18x with SDP does not complete
an offer/answer; thus an UPDATE with SDP would be rejected.
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