Thanks for the reply.
But the in the RFC (28.1 Major Functional Changes) it is mentioned that:
A UA cannot send a BYE for a call until it has received an ACK for
the initial INVITE. This was allowed in RFC 2543 but leads to a
potential race condition.
Please let me know the correct behavior in this case.
Thanks and regards,
Sunil
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Iñaki Baz
Castillo
Sent: Wednesday, January 13, 2010 3:42 PM
To: [email protected]
Subject: Re: [Sip-implementors] INVITE Transaction
El Miércoles, 13 de Enero de 2010, [email protected] escribió:
> Hi,
>
> I have one doubt in this.
> If ACK is not properly sent by the UAC, how will the call be terminated?
> Will the UAC send a CANCEL
How can now the UAC that its ACK didn't arrive to the UAS? just by inspecting
the arrival of new 200 responses (same response) which means that the UAS
didn't receive the ACK (or the proper ACK).
> or will the other end send a BYE to terminate
> the call?
The SIP dialog is creted with the INVITE and 200, regardless of the
presence/abscense of the ACK, so the call must be terminated with a BYE (from
the caller or called).
A CANCEL from UAC is not valid as the INVITE was already accepted.
--
Iñaki Baz Castillo <[email protected]>
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