[SR-Users] Changing the text of reason header in CANCEL messages

[Klaus Feichtinger]

Klaus,

thanks for your confirmation - I have tested this way and it is working
fine. Now I'm able in adapting the Reason header to a format I want to
use.

First I was not sure if this idea ("spiraling") was just a mad phantasm of
mine or not. But now I'm convinced that it is a useful way :-)

regards,

Klaus

>
>
> Am 16.12.2010 12:41, schrieb Klaus Feichtinger:
>> Hello,
>>
>> I want to ask if you know any possibility in changing the text of the
>> SIP reason header in CANCEL requests. Is the limitation still the same
>> as described in the mail below from May 2010?
>>
>> For my scenario I have to use the TM module, because incoming requests
>> from the PSTN gateway are parallelly forked to two destinations.
>> Whenever the pending call is cancelled by the PSTN gateway the CANCEL
>> request is still containing a reason header (Q.850;cause=16). But I
>> would like to adapt the text of this header according RFC3326 (e.g.
>> 'Reason: SIP ;cause=487 ;text="Request Terminated"'). The feature
>> "e2e-cancel-reason" is working fine - the original text is copied, but
>> no textops function can make any change.....
>
> What about changing the gateway to send the Reason header you want?
>
>> Is there any trick possible to change the text of this header before
>> it is handled by the proxy (e.g. in creating a spirale - change the
>> text and forward it to the same proxy again)?
>
> You should be able to do it as you said - by stateless [1] spiraling the
>  call (INVITE+...+CANCEL) one time and modify the Reason header of the
> CANCEL request using textops. (by using stateless forwarding the CANCEL
> is not hop-by-hop but forwarded too).
>
> http://www.kamailio.org/dokuwiki/doku.php/core-cookbook:3.1.x#forward
>
> Klaus
>
>> Or in worst case if this is currently absolutely impossible - would
>> this be an acceptable request for a new feature in any upcoming
>> release of Kamailio 3.1.x? In the release 3.1.x it is still possible
>> to store the text of an incoming reason header, so I guess it could be
>> no problem in overwriting this text with any function...... Is anybody
>> else interested in this feature?
>>
>> regards,
>> Klaus
>>
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> Am 21.05.2010 09:26, schrieb François BERGANZ:
>>
>>      When I use forward, it doesnt work!
>>      I don't know how to do
>>
>> It works fine for me:
>>
>> route{
>>
>>         if (is_method("CANCEL")) {
>>                 if (!is_present_hf("Reason")) {
>>                         xlog("L_ERR", "reason missing");
>>                         append_hf("Reason: Q.850; cause=31\r\n");
>> xlog("L_ERR", "Reason added");
>>                 }
>>                 forward();
>>                 exit;
>>         }
>>
>>
>>
>>
>> Note: above code snippet only works if the proxy does not do any
>> parallel forking of the INVITE. It may also be necessary to change the
>> request-URI to forward the request to the same destination as the
>> INVITE.
>>
>> in:
>> U 2010/05/21 10:29:38.372934 83.136.33.3:16534 ->  88.198.53.113:5060
>> CANCEL sip:01505641... at 83.123.45.165 SIP/2.0
>>
>> Via: SIP/2.0/UDP
>> 10.10.0.51:16534;branch=z9hG4bK-d8754z-7b591160b17cfc57-1---d8754z-;rport
>>
>> To: "01505641636"<sip:01505641... at 83.123.45.165>
>> From:<sip:kl... at 83.123.45.165>;tag=7c681960
>> Call-ID: MzcxYTgzZmIwMGYyMTA4YzVkN2IzZDhjYjhjYjYwNTk.
>> CSeq: 2 CANCEL
>> User-Agent: eyeBeam release 1102q stamp 51814
>> Content-Length: 0
>>
>>
>> out:
>> U 2010/05/21 10:29:38.373331 88.198.53.113:5060 ->  83.123.45.165:5060
>> CANCEL sip:01505641... at 83.123.45.165 SIP/2.0
>>
>> Via: SIP/2.0/UDP
>> 88.198.53.113;branch=z9hG4bK-d8754z-7b591160b17cfc57-1---d8754z- Via:
>> SIP/2.0/UDP
>> 10.10.0.51:16534;received=83.136.33.3;branch=z9hG4bK-d8754z-7b591160b17cfc57-1---d8754z-;rport=16534
>>
>> To: "01505641636"<sip:01505641... at 83.123.45.165>
>> From:<sip:kl... at 83.123.45.165>;tag=7c681960
>> Call-ID: MzcxYTgzZmIwMGYyMTA4YzVkN2IzZDhjYjhjYjYwNTk.
>> CSeq: 2 CANCEL
>> User-Agent: eyeBeam release 1102q stamp 51814
>> Content-Length: 0
>> Reason: Q.850; cause=31
>>
>>
>>
>> regards
>> Klaus
>>
>>
>>
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
>> list sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users