Re: [sipcore] draft-ietf-sipcore-reinvite-06 and new contact in 2xx to *inital* invite
Bob Penfield <BPenfield@acmepacket.com> Wed, 10 November 2010 14:03 UTC
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From: Bob Penfield <BPenfield@acmepacket.com>
To: Paul Kyzivat <pkyzivat@cisco.com>, "sipcore@ietf.org" <sipcore@ietf.org>
Date: Wed, 10 Nov 2010 09:04:00 -0500
Thread-Topic: [sipcore] draft-ietf-sipcore-reinvite-06 and new contact in 2xx to *inital* invite
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Subject: Re: [sipcore] draft-ietf-sipcore-reinvite-06 and new contact in 2xx to *inital* invite
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inline >-----Original Message----- >From: sipcore-bounces@ietf.org [mailto:sipcore-bounces@ietf.org] On Behalf Of Paul Kyzivat >Sent: Wednesday, November 10, 2010 5:17 AM >To: sipcore@ietf.org >Subject: Re: [sipcore] draft-ietf-sipcore-reinvite-06 and new contact in 2xx to *inital* invite > > >On 11/10/2010 5:31 PM, Taisto Qvist wrote: >> Hi folks, >> >> A while ago I started a discussion concerning how a client should be have >> when it receives a new contact in the 2xx of an initial INVITE, compared to >> the early dialog-establishing 183. >> >> My reading of chapter 13.2.2.4, rfc3261, tells me that a client should NOT >> update its remote target with the Contact of the 2xx. >> The Contact of the 2xx, should be the same as the 1xx. >> >> I have now read draft-ietf-sipcore-reinvite-06 and I am trying to interpret >> the results, since even if that document mainly concerns re-invite, chapter >> 4.9 discusses the early dialog created by an initial request. >> >> The document does not however mention(?) differences in contact:uri between >> the initial 1xx, and the final 2xx to the INVITE. >> >> The draft mandates that a successfull response, a reliable provisional >> response, or an in-dialog request to the new target implies a successfull >> change of contact-uri. >> >> Should I therefore assume that since a 2xx in a normal (initial) invite, is >> also retransmitted reliably, that a UAC which receives a new contact in the >> 2xx compared to the contact in a 1xx(wether it has been sent reliably or >> not), MUST update its remote target? >> >> Since this (seems to) contradict 13.2.2.4, I would very much appreciate your >> views. > >I'm interested to hear Gonzalo's take on this. >IMO the most reasonable thing to do in this circumstance is to honor the >new contact in the 2xx. This is probably contrary to 3261. Whether it is >supported by ...sipcore-reinvite... may be debatable. > The text below indicates that procedures in 12.2.1.2 should be used when the 2xx matches an existing early dialog. These are the same procedures for a target refresh requests. That section has no procedures for constructing the route set, but does indicate that the remote target is updated. I have always used the Contact from the 2xx final response as the remote target of the confirmed dialog. >> If the dialog identifier in the 2xx response matches the dialog >> identifier of an existing dialog, the dialog MUST be transitioned to >> the "confirmed" state, and the route set for the dialog MUST be >> recomputed based on the 2xx response using the procedures of Section >> 12.2.1.2. Otherwise, a new dialog in the "confirmed" state MUST be >> constructed using the procedures of Section 12.1.2. >> >> >> Note that the only piece of state that is recomputed is the route >> >> set. Other pieces of state such as the highest sequence numbers >> (remote and local) sent within the dialog are not recomputed. The >> route set only is recomputed for backwards compatibility. RFC >> 2543 did not mandate mirroring of the Record-Route header field in >> a 1xx, only 2xx. However, we cannot update the entire state of >> the dialog, since mid-dialog requests may have been sent within >> the early dialog, modifying the sequence numbers, for example. > > Note that the route-set doesn't include the contact. Maybe that was your > point. >
- [sipcore] draft-ietf-sipcore-reinvite-06 and new … Taisto Qvist
- Re: [sipcore] draft-ietf-sipcore-reinvite-06 and … Paul Kyzivat
- Re: [sipcore] draft-ietf-sipcore-reinvite-06 and … Bob Penfield
- Re: [sipcore] draft-ietf-sipcore-reinvite-06 and … Taisto Qvist
- Re: [sipcore] draft-ietf-sipcore-reinvite-06 and … Paul Kyzivat
- Re: [sipcore] draft-ietf-sipcore-reinvite-06 and … Taisto Qvist