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

On Fri, 2008-12-05 at 13:43 -0500, Hadriel Kaplan wrote:
> > From: Dale Worley [mailto:[email protected]]
> >
> > I think you're getting into a lot of trouble with this.  For one thing,
> > if a request forks, it creates multiple dialogs.  If the UAC inserted a
> > session-id, all those dialogs share the same session-id.  Previously,
> > that situation is disambiguated by identifying a dialog by giving
> > call-id/from-tag/to-tag.  But session-id alone is ambiguous, so it can't
> > be used to replace the current dialog identifiers.  And since we assume
> > that the tags will be changed by B2BUAs, session-id/from-tag/to-tag
> > won't work at all.
> 
> No - read the (latest) draft.  The to-tag is in fact also used, to
> dis-ambiguate these things.  And I note that this would mean it can't
> be changed.  I'm on the fence whether to create a surrogate for that
> as well. (ugh)

But B2BUAs now change to-tags, so we don't have the "works in most
current deployments" condition.  Also, to-tags may have the same problem
as call-ids, namely that they reveal the manufacturer of the originating
UA.  I think the mechanism needs to be revised to deal with this.

Dale


_______________________________________________
Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [email protected] for questions on current sip
Use [email protected] for new developments on the application of sip