Re: [Sip] I-D on handling large UDP responses

[Dale.Worley at comcast.net]

In regard to 140's sent by proxies when about to send an oversized
request:  I forgot that 1xx's other than 100 can have a missing
to-tag, but that is so.  (section 13.2.2.1) But within-dialog requests
have to-tags and demand responses that do, too, so I'd say that the
140 should have a to-tag if and only if the request does.  (If an
initial request elicited a 140 with a to-tag, the to-tag would
necessarily be different from any UAS's to-tag, and the UAC might
construct an early dialog for it.)

We might be able to reduce the number of 140's by having the proxy in
question add a (short!) parameter to the Via of the outgoing request
indicating "140 already sent for this request".  Then a proxy would
not generate a 140 for a request that had this flag on a Via.

Dale

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