One problem identified with Target-Id was that a proxy that retargets
and doesn't support Target-Id might just forward an existing Target-Id
rather than remove it. I think history-info has a similar property,
i.e., the last history entry will not necessarily reflect the most
recent target. Would anybody care to comment on this?
John
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mary Barnes
Sent: 13 March 2008 15:34
To: [email protected]
Subject: [Sip] History-Info: UA loose route versus Target header
Per my comments at the microphone, here's my assessment of the
difference between the two documents as they apply to History-Info as a
potential solution.
draft-rosenberg-sip-ua-loose-route-02 clearly states that
History-Info functionally can be used to solve the problem described in
that document. However, Jonathan's objective is to solve a fundamental
problem of not distinguishing routing versus re-targeting (read section
5). This document would actually change the content of the History-Info
headers for the same requests, just as it's already identified in RFC
4244 that if you have loose routing in general, that the information is
different in History-Info.
The document draft-holmberg-sip-target-uri-delivery-01.txt
doesn't do anything to change fundamental SIP processing. It just adds
another header that contains information that would already be contained
in History-Info. History-info provides a complete history of the
processing of a request, with the indexing provided by the entries and
the reasons, you know exactly why a request was either "retargetted" or
"re-routed". The examples in the appendix would apply to the use cases
you are attempting to solve as described in Jonathan's document.
Mary.
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