From: "karthik" <[EMAIL PROTECTED]>

   As per RFC 3261 it is given in section 16.4 that the Proxy has to remove
   the Default port and transport in the Request URI when it gets an INVITE
   with those parameters.

More exactly, that processing is to be done only when an maddr
parameter is present:

   If the Request-URI contains a maddr parameter, the proxy MUST check
   to see if its value is in the set of addresses or domains the proxy
   is configured to be responsible for.  If the Request-URI has a maddr
   parameter with a value the proxy is responsible for, and the request
   was received using the port and transport indicated (explicitly or by
   default) in the Request-URI, the proxy MUST strip the maddr and any
   non-default port or transport parameter and continue processing as if
   those values had not been present in the request.

I do not know the significance of maddr, but it is used when sending
requests to multicast addresses.

Dale
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