I've seen several approaches for configuring an outbound proxy.  The FAQ
suggests using DHCP or SLP.  PHONECTL was another option.  In
draft-kempf-sip-findsrv-00.txt (Feb 2000) there was a statement in the
introduction that says "... a UAC can send an INVITE message via
multicast in order to determine its local outbound proxy."

Consider the following: if I multicast an INVITE request with
Max-Forwards: 0 and then wait for the proxies listening on the multicast
address to respond with 483 Too Many Hops.  The UAC could use the
address the 483 came from as the value of the outbound proxy and unicast
future requests through this proxy.  Would this be another valid
approach to finding an outbound proxy?  Any thoughts?

The reason for adding the Max-Forwards: 0 header was to get a quick
response from a proxy.  This way the UA can send out this request when
the device starts up and get a response fairly quickly to set the
outbound proxy.

Thanks,

-Jeff

--
Jeff Mark                              Intel Dialogic Division
Software Engineer                      201 Mentor Dr, Suite 100
mailto:[EMAIL PROTECTED]          Santa Barbara, CA 93111
http://www.dialogic.com                (805) 879-3640
PGP KeyID: 0x6A0DC407                  (805) 967-1395 fax
http://www.keyserver.net


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