Hi Mark ,
                I got confused after reading your question .
In which case a Proxy will need to do this ?

Let me elaborate my point a little more .

Suppose P1 gets an INVITE from E1. P1 is a proxy of domain D1 . and
INVITE contains a "To:" uri which belongs to domain D2 .
Now we say P1 will query registrar of D2 domain . In this case P1 will
add "<Domain_Name>"(e.g domain2.com) in ReqUri field of REGISTER
request . And P1 will add  "<[EMAIL PROTECTED]>" (e.g [EMAIL PROTECTED])
. And in FromUri  P1 will add its own URI .

But doing this makes no sense as P1 could have forwarded INVITE also
with the same
ReqUri and To-Uri fields .

This was the way i think . Quite possible that i didnt answer your
question . In any case , do write back to discuss things .

Regards
Satyarth Negi

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