[Serusers] Race Condition on CANCEL?

[Gustavo Passos Tourinho]

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                       
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>