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

[Dale.Worley at comcast.net]

In regard to adding a Session-Id to requests are not given one by the
UAC:

A B2BUA can add one, of course.  But a proxy can also add a header to
a request, and can remain strictly RFC 3261 compliant while doing so.

A larger problem is that this added Session-Id is not observable from
the "input" side of the B2BUA, meaning that the correlation between
the incoming Call-Id and the Session-Id can only be reliably extracted
from the B2BUA itself, which obviates much of the value of Session-Id.
However, the B2BUA can create a 100 response to the request that
contains the Session-Id header and can send it to the upstream
element.  This makes the added Session-Id manifest to any network
logging.

Which leads to the question of whether we want to include Session-Id
in responses as a matter of course (as we do Call-Id).

Also, given the intended ubiquity of Session-Id, a one-letter
abbreviated header name should be defined.

Dale
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