I would like affirmation (or negation+correction) of my understanding of how
the Req-URI is to be built for a PRACK when the proxy does not add a Record
Route.
Since the CONTACT is mandatory on a reliable provisional response, the PRACK
must use the CONTACT to build the REQ-URI.
This means that the PRACK will bypass the proxies, since none of them have
record routed.
A PROXY THAT DOES NOT RECORD ROUTE DOES NOT EVER SEE A PRACK (unless it is
the default outbound local proxy). Correct?
The 100rel draft does not specifically mention this, probably because this
is the only obvious conclusion from the statement in the UAS section about
CONTACT being mandatory on the reliable prov response.
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