From: "erol turac" <[EMAIL PROTECTED]>

   If the registrar allows UACs to register with same pin, password
   and URI with different IP, the only solution will be that the
   incoming INVITE from the UAC5 should be forked to both UAC1 and
   UAC2. Forking should be implemented by proxy,

That is correct.  But if the proxy examines the registration database
and discovers that there are two contact addresses for the
request-URI, it can fork the request to both of them.  See the
procedures in section 16.5 of RFC 3261.

As Scott mentions, in the sipX system, the proxy does not do location
lookups itself.  Instead, it forwards the request to a "redirection
server", which always responds to requests with a 302 Moved
Temporarily reponse, which gives the locations to which the request
should be send.  The proxy then acts on the 302 response by forwarding
the request to the correct locations.

Dale
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