Re: [Sip] Why do we need 3-way handshake for INVITE transaction....

["Arjun Roychowdhury" <aroychow@hns.com>]

On 05/30/2003 03:03:53 PM, "Vishal Phirke" wrote:

> 2. Invites can be forked. And if multiple destinations send 
> 200 OK, you
> don't want to end up with multiple connections. Instead, 3-way 
> handshake
> allows the decision of accepting one of them delayed till Ack 
> is sent by
> the originator of the request.
> 

I dont think this is a valid reason for 3-way handshakes. By definition, 
all 200 OKs are proxied back. Its upto the caller UA
to then send BYE/OK to callees that it does not want to talk to due to 
forking. Therefore, the ACK is sent to all of them and doesnt
help in delaying the decision.

regds
arjun

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