From: "Mohammed Hanifa" <[EMAIL PROTECTED]>

   will the Proxy2 authenticate the SUBSCRIBE request? If yes, how
   could the UA1 in the Proxy1 know the credential of Proxy2.

In general, implementors have ignored this problem.  I suspect that
once they start considering it, they will divide subscribers only into
"inside my domain" and "outside my domain".  That eliminates the need
to do inter-domain authentication.

Dale
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