Re: [Serusers] Race Condition on CANCEL?

Well, if the callee/UAS wrongly sends a 200 OK for INVITE, the caller/UAC should immediately send a BYE, assuming that their paths crossed. I would start trying to figure out why the UAS sends the 200 OK if it already has sent cancelling. But anyway, a UA can be turned off (power or network cuts) and you have dangling Start-Invites, so you need a way to deal with those. g-)

Gustavo Passos Tourinho wrote:

Thanks for your reply.

Yes, I have this problem right now. The problem is that when the proxy receives 200 OK (for INVITE, confirmed by CSeq), insted of 200 Cancelling, it issue an RADIUS request for billing.

So, I will have an "Start-Invite" (200 OK), but will have not a "Stop-Bye" because the BYE message will not be generated.

How can I ensure that the proxy will not forward 200 OK for INVITE? I mean, if it is a transaction statefull and the transaction doesnt existis, why it is stills forwarding the message? Is there any thing that I can do to prevent this kind of situation to occour?

Thanks again.

Regards, Gustavo

Greger V. Teigre escreveu:

...

No, the UAS (U2) shall answer with 200 OK to confirm that the call has been canceled and yes, it should be sent to U1. Do you have an actual experienced problem or was the 200 OK the problem? g-)

Gustavo Passos Tourinho wrote:

...

Hello,

Im having some problems with cancelled calls. This is the scenario:

U1 Proxy U2

INVITE -->>> <<--- 100 Trying INVITE -->>>

<<--- 100 Trying
                           <<--- 100 Trying  CANCEL  

->>> <<-- 200 Cancelling CANCEL ->> <<-- 180 Ringing <<-- 487 Cancelled <<-- 180 Ringing

    <<-- 200 OK
                                (Wrong??)
                             <<-- 200 OK

My problem is that after some time waiting for "ringing", the user cancel the call. Even that proxy responses "487" it still forward the late 200 OK.

Should it forward? I guess not because the transaction was destroyed, right?

Can it be a configuration problem on my ser.cfg ou it can be in t_relay implementation?

Thanks in advanced. Regards,

Gustavo _______________________________________________ Serusers mailing list Serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers