> Do any of you have call flow examples 
> of Third-Party registration that you
> could share?

It is the same as a normal registration except 
the From reflects the sender and the To reflects 
the party for which the contact modifications 
should apply.  

The authentication and trust relationships
can produce various deferent call flows.
The typical case would be to send the REGISTER
to the To's registrar.  It would challenge
the request using the To party's authentication 
credentials.  

Other flows might involve only/additionally
a proxy authentication based upon the From 
party.  These might involve the From party's
proxy or a 3rd-party authentication validator.

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