________________________________________
From: [email protected] 
[[email protected]] On Behalf Of Vijay K. Gurbani 
[[email protected]]

I suspect that any other SIP server in the world that tries to
look up "invalid-domain.net" will reach the same conclusion
as every other SIP server before it.

In that case, regardless of (a) or (b), a 604 seems appropriate
since trying elsewhere is not going to substantially increase the
odds of finding that domain.
_______________________________________________

Tsk!  But you don't know that every fork of the request has a request-URI in 
the invalid domain.
That's the trouble with 6xx responses -- they assert something about every fork 
of a request,
but no UAS can possibly know the RURIs of all the forks.

Dale

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