[Serusers] RE: [Sip-implementors] FW: Forking Proxy

[sreeram.kanumuri at wipro.com]

Hi Jason Penton,

>>* My question here is: who is in the wrong???? The proxy or UA1?
UA1 is wrong.
>>* Should the proxy change the to-tag of the ACK before forewarding it
to UA3???
Proxy should just Forward the message .Proxy should not change the
to-tag.


Thanking you,

Regards,
Sreeram
Phone: 8520408 Ex:3208


-----Original Message-----
From: sip-implementors-bounces at cs.columbia.edu
[mailto:sip-implementors-bounces at cs.columbia.edu] On Behalf Of Jason
Penton
Sent: Thursday, April 01, 2004 1:29 PM
To: sip-implementors at cs.columbia.edu
Cc: serdev at lists.iptel.org; serusers at lists.iptel.org
Subject: [Sip-implementors] FW: Forking Proxy


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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