> Would  it be incorrect to use the term b2bua 
> to refer to a UAC-UAC concatenation?

If the mentioned UAC endpoints truly never 
act as a UAS within a given dialog,
b2buac would be the better definition.
However to truly satisfy such a definition would
be rare since it would need to drop incoming 
requests traversing the dialog or provide a 
Contact of another device to ensure that it
would not need to act as a UAS.  

Note that a 3pcc b2bua which intends to reject
all dialog related incoming requests with
something like a 405 or 403 is still acting
a UAS when it rejects the requests.  Thus
it would still be considered a b2bua instead
of a b2buac.

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