From: "Stephan Steiner" <[EMAIL PROTECTED]>

   Is there any type of UAS to which the header processing rules mentioned
   before do not apply? Is B2BUA really a loophole to not do things a proxy
   should do just because it isn't a real proxy per definition (even though it
   basically does the same things.. it just does more than a proxy does)?

There are no rules for a B2BUA -- as a sender, it is a UAC and can
compose requests however it wants.

A better approach with the vendor would be to point out to them that
their B2BUA makes changes in the request that make it impossible for
the ultimate application of SIP to work, and that if they don't fix
that you will have to replace the device.

Dale
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