> From: Paul Kyzivat <pkyzi...@alum.mit.edu>

> I disagree here. UA B would be irresponsible if it created an INVITE 
> including a header field that it doesn't understand.

Why would it be irresponsible?

It's not UA B that's deciding to produce the INVITE, it's the element
that sends the REFER to UA B that is deciding that Replaces is needed.

And that element is responsible for deciding to what to do if
destination of the INVITE does not understand Replaces -- ignore it
(the default) or reject the INVITE (by also putting
"&Require=replaces" into the Refer-To URI).

Dale
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