[reSIProcate] Treatment of CANCEL in UAS_Accepted or UAS_AcceptedWaitingAnswer

[Boris Rozinov]

Scott,

I believe you are right and UAS behaves correctly by just responding 200OK to Cancel. It brings us to UAC side (in our case both UAC and UAS are implemented using resiprocate).  UAC was supposed to wait for 200OK/INV and then respond by ACK and then send BYE. But DialogSet::end() sends CANCEL and in absence of created dialogs invokes mDum.destroy(this) and effectively destruct itself and as result delayed (or retransmitted) 200OK/INV are thrown away as stray response.

Thanks,
Boris


--- On Tue, 9/1/09, Scott Godin <sgodin at sipspectrum.com> wrote:

> From: Scott Godin <sgodin at sipspectrum.com>
> Subject: Re: [reSIProcate] Treatment of CANCEL in UAS_Accepted or  UAS_AcceptedWaitingAnswer
> To: "Boris Rozinov" <borisrozinov at yahoo.ca>
> Cc: resiprocate-devel at resiprocate.org
> Received: Tuesday, September 1, 2009, 1:22 PM
> I believe DUM is behaving according
> to RFC3261 - section 9.2:
> 
> If the transaction
>    for the original request still exists,
> the behavior of the UAS on
>    receiving a CANCEL request depends on
> whether it has already sent a
>    final response for the original
> request.  If it has, the CANCEL
>    request has no effect on the processing
> of the original request, no
>    effect on any session state, and no
> effect on the responses generated
>    for the original request.
> 
> Scott
> 
> On Mon, Aug 31, 2009 at 11:52 PM, Boris Rozinov<borisrozinov at yahoo.ca>
> wrote:
> > Hi all,
> >
> > Due to race condition UAS may receive CANCEL for the
> initial INVITE transaction in Accepted or
> AcceptedWaitingAnswer state. As transition to OnCancel state
> occurs, 200 OK response for Cancel is sent, but session is
> not terminated and session handler is not notified.
> > Does not it make more sense to send BYE (dialog is
> already established), terminate session and notify session
> handler (or just dispatch Cancel treatment to
> InviteSession)?
> >
> > Thanks,
> > Boris
> >
> >
> >    
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> 


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