Hi,

> And mixing the ringback tone into the stream that's ultimately going to carry 
> voice is not an option?

well, after the user agent receives the 200 OK with a new port it should
stop sending/receiving on the old port and use the new port from 200 OK
because the 183 Session Progress in only a early media connection which
"went away" after the session is completly up!

> Remember, each network address change brings a potential NAT traversal 
> process, with associated potential for breakage.
> So far I haven't seen any PBX changing the SDP between early and complete 
> phases. Also, as Pekka has mentioned, it hits some really weird SOA-in-SIP 
> scenarios; I'm not sure it's even allowed by the specs.

hehe, we have such a Siemenes Hipath Gateway which use different ports
for Session Progress and 200 OK *G*


Best regards,
Bernhard Suttner



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