SER(http://www.iptel.org/ser) supports mutil-branch feature as you refered to.
It will accept the first arrived 200 OK and cancel the other two branches.
>Hello,
> Consider the following situation.
> Adam wants to call Bob, let?s say that Bob is registered at
> three locations, that is, at home, at head office and at his
> branch office. Hence, when Adam makes a call, INVITE request is
> forked by the proxy and it reaches all the three destinations.
> Hence, three 200 OK SIP response will be sent back to Adam.
> Consider the situation, when Bob?s friends answer the call at all
> the three locations at the same time, what will happen? Either
> three media channel will be established between them or which two
> will be discarded.
> Can anyone please clear this?
> With regards
> Raj.
Regards,
luke
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