[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. 