From: "Reynolds, Paul" <[EMAIL PROTECTED]>

   D) Send a failure (and if so, what? 400?)

You should send a failure (you quoted the text that requires you to do
so).  The failure you should send is 500 (which is used for all
situations where CSeq is l.e. a previously seen CSeq), officially
called "Internal Server Error", but would be better called "Out of
Sequence" (and which should be a 4xx error, but that's another
matter).

Dale
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