Thanks Mary.
By the way, RFC 4458 (voicemail URI) describes in the last paragraph of section
4 how History-Info solves the problem of URI parameters being dropped as a
result of routing or retargeting.
Therefore, if we chose the History-Info route for this problem, RFC 4458 would
magically be forward compatible.
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Barnes,
Mary (RICH2:AR00)
Sent: Thursday, March 13, 2008 08:34
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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