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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