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

[Klaus Darilion]

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