Paul Kyzivat wrote:
The simple answer to your question is: you must include the to-tag to
conform to 3261.
I think the question you are really asking is: "will the UAC and
intervening proxies do the right thing if the to-tag is not present in
the response?"
The answer to that is "probably". RFC 2543 didn't have to/from tags.
So if the UAC calls a UAS that only conforms to 2543 then it will get
this situation. So any element that attempts to be 2543 compatible
will deal with this.
I'd like to point out that we've already taken the first steps of
actually breaking 2543 compatibility with RFC 4916. I would not be
surprised if we take further steps away from 2543 compatibility in the
future.
In other words: I would be very cautious in relying on *any* 2543
backwards-compatibility mechanisms.
/a
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