> Since these are B2BUAs, there are *three* different
> early dialogs here:
> - UAC:B2BUA1
> - B2BUA1:B2BUA2
> - B2BUA2:UAS
> All the rules regarding route sets, etc. apply
> separately to each.

I agree.  However, I just wanted to mention that the 3gpp specs appear to
be requiring B2BUA Application Servers to add Record-Route instead of
replacing a gruu Contact.  I'm not sure how well the 3gpp requirement will
work since nothing has been specified for building (record routing) routes
for use when sending a request to a gruu location.
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