Re: [Sip] FW: I-D Action:draft-kaplan-sip-session-id-00.txt

["Ian Elz" <ian.elz at ericsson.com>]

Dan, Hadriel,

I don't think that having the first B2BUA synthesize the session-id
would work. The idea is to have it end-to-end to solve the problem so
having it put in by a B2BUA would not solve the problems.

The bigger issue is what is to stop a B2BUA either removing the
session-id or generating one of its own. While this draft proposes B2BUA
actions the defined actions will only occur if the B2BUA fully
implements this draft.

RFC 3261 defines a B2BUA as a concatenation of a UAS and a UAC. What
happens between the UAS and UAC parts is undefined and there is no
specification as to what actions the B2BUA should take when passing a
request from the UAS to the UAC. There was a draft presented to the
sipping wg to try an define actions of B2BUAs but this was rejected by a
hum as dangerous. I guess that the consensus was that the B2BUA should
remain totally undefined so that it could perform any action that was
required. [Declaration of interest: I was a contributor to this now
expired draft.]

Hadriel,

A couple of additional items which may need to be considered in the
draft.

Is it possible to include a list of headers which currently use the
existing dialog identifiers? Others which you have not mentioned include
Target-dialog, Join and In-reply-to.

Is it proposed to propose modifications to the RFCs for the existing
headers which use dialog ids to use the session-id?

It is probably necessary to specify B2BUA actions in cases of 3PCC and
what happens to the session-id in these cases.


Ian Elz

System Manager
DUCI LDC UK
(Lucid Duck)

Office: + 44 24 764 35256
gsm: +44 7801723668
ian.elz at ericsson.com

-----Original Message-----
From: Dan Wing [mailto:dwing at cisco.com] 
Sent: 19 November 2008 06:24
To: 'Laura Liess'; 'Hadriel Kaplan'; 'SIP List'
Subject: Re: [Sip] FW: I-D Action:draft-kaplan-sip-session-id-00.txt

> The problem which I  have with this particular solution
> is that it requires changes in existing user devices.

For UAs that don't generate session-id the first B2BUA 
could synthesize a session-id.

-d


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