[Serusers] FW: Forking Proxy

[Jason Penton]

Hi All 

Sorry about the last post - I have attached the call flow as an image this
time :-)

I have a question about the CORRECT operation of UA when making a call via a
forking proxy:
 
(see attached image for call flow)
Lets say UA1 calls 7000 at sip.com and user 7000 at sip.com is available at UA2
and UA3 i.e. the Proxy forks the request.

* UA1 is using the to-tag of the first 180 RINGING it received (frame 5) no
matter what the to-tag in the 200 OK is
* My question here is: who is in the wrong???? The proxy or UA1? 
* Should the proxy change the to-tag of the ACK before forewarding it to
UA3???

Jason Penton
Rhodes University 
Grahamstown
South Africa
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