On Friday 07 March 2008, Maxim Sobolev wrote:
> PRACK has nothing to do with it. It is for reliable delivery of non-100
> provisional replies (i.e. 180, 183 etc). For 100 reliable delivery
> relies on INVITE retransmits.

Well, your complaint was that the phone kept ringing. Thus it should have sent 
a 180 and/or 183. Those can be sent reliably to obtain the behaviour you 
request.

In your scenario, what should happen when the UAS sends no 1xx reponse at all, 
but directly a 200 OK?. A cancel from the proxy doesn't work in that case.

-- 
Greetings,

Alex Hermann

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