[Kamailio-Users] How to send a to-tag in a CANCEL request generated by carrierroute?

[mayamatakeshi]

On Thu, Mar 5, 2009 at 1:10 AM, Iñaki Baz Castillo <ibc at aliax.net> wrote:
> 2009/3/4 mayamatakeshi <mayamatakeshi at gmail.com>:
>> Hello,
>> I'm using the module carrierroute. I'm setting the carrierfailureroute
>> table to try a second route if the first one times out. The first
>> route is a GW that sends 183 Ringing with SDP and to-tag.
>> But when the failure_route is called due to timeout and the second
>> route is resolved I see kamailio sending a CANCEL without a to-tag and
>> the GW replies with "481 Call Leg/Transaction Does No Exist". So, This
>> fails to cancel the first request. How can I make kamailio send the
>> to-tag in the CANCEL request?
>
> Don't trust that GW. A CANCEL MUST NOT containg To tag (except if it's
> a CANCEL for a re-INVITE, but it's not common and it's not your case).
>> Also, I noticed kamailio sends the INVITE to the second route before
>> sending the CANCEL to the first one. Was this coded on purpose? (I
>> believe this doesn't go against the RFC, but it is something curious).
>
> It's faster in this way :)
> Why to wait until the CANCEL is sent?

Hi Iñaki,
That's right. I got it.
Thanks.

br,
takeshi