It may be that you are not handling the CANCEL correctly. An early CANCEL (no Route headers) will have to be routed as an INVITE.
g-)

Abdul Qadir wrote:

Hi,

>I think ser should remember canceled transactions and send CANCEL in
>case of delayed provisional replies.

At present I don't think its working like this, As soon as CANCEL hit SER an immediate too many hops is returned to sender and call continues....resulting in ghost call, where A party has dropped after sending cancel and B still carries on as no cancel was sent to B.

Best Regards,
Abdul Qadir

Klaus Darilion <klaus.mailinglists@pernau.at> wrote:
Abdul Qadir wrote:
> Hi ,
>
> I tried to call from one nokia sip (E61 and other models )phone to another nokia sip phone. The call works fine. The problem comes only when I call from Phone A to Phone B and then immediately cancel the call(from Phone A). The Phone A will hangup the call as it sent CANCEL but the SER will ignore this CANCEL and still send INVITE to Phone B resulting in a ghost call situation.
>

Hi!

I think ser should remember canceled transactions and send CANCEL in
case of delayed provisional replies.

regards
klasu

> I tried to capture a log of message and found that Phone A "CANCEL" message is received on SER even before any provisional response from Phone B. Therefor SER doesnot relay this CANCEL request to Phone B. I even checked RFC which clearly says that UAC should not send CANCEL untill it receives any provisional response. I talked to Nokia expert and they said the 100 Trying message from your server is considered as provisional response, therefor behaviour of client is absolutely correct.
>
> Is there any way I can stop 100 Trying message and still run statefull SER, so that I can verify what nokia said. Any ideas suggestions are welcome.
>
> Thanking you all in advance.
>
> Best Regards,
> Abdul Qadir
>
>
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