15 May
2007
15 May
'07
5:51 p.m.
Inline.
Gustavo Passos Tourinho wrote:
Hello All,
I Guess that the Proxy relays 200 OK (INVITE) because it didnt destroyed the
transaction correctely affter it was canceled, right?
No, the proxy MUST relay the 200 OK. The caller UA (UAC) should then
send an immediate BYE. The callee UA (UAS) wrongly(?) sends a 200 OK
after it claims to cancel the call. However, this may happen due to a
race condition that is unavoidable (RFC3261)
I was looking for a possible configuration bug (ie.
relaying 200 OK
statelessly), but there is no such think. All relays are done by t_relay ()
function.
Your problem is that the caller UA does not immediately send a BYE.
Another question. If a cancel request is not replyed
with a response after some
time, the UA should try to retransmit it? After reading the RFC 3 times I just
so that the CANCEL cannot be challenge.
That's correct, a CANCEL cannot be challenged (as in authentication).
g-)
Well, thank you very much for your help.
Regards,
Gustavo
Greger V. Teigre escreveu:
As I said, I would start finding out why the UA
sends 200 OK after it has sent
canceling.
There is no sign of any bugs in CANCEL transaction. As I explained, the CVS
trunk changes are related to how CANCELs are handled. Your CANCEL reaches the
UA ok.
g-)
Gustavo Passos Tourinho wrote:
> Hi,
>
> So, is there a BUG in CANCEL transaction?
>
> How can I confirm this information?
>
> Thanks
>
> Atle Samuelsen escreveu:
>> Hi,
>>
>> I might be wrong, but I think Andrei added some code in CVS head a few
>> days back that addresses this issue.
>>
>> -A
>>
>> * Gustavo Passos Tourinho <gustavo.passos.tourinho(a)gmail.com> [070511
13:57]:
>>
>>> 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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>>
>