[OpenSIPS-Users] CANCEL packet modification.

[Bogdan-Andrei Iancu]

Hi Igor,

The CANCEL requests are propagating hop by hop (and not end-to-end) - 
this means the request is re-generated by each hop. This is why you 
cannot change it.

What exactly are you trying to achieve here ?

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 04.08.2014 15:40, Igor Olhovskiy wrote:
> Hi!
>
> I've tried some modification of in-transaction CANCEL packets.
> Idea A call B, than A cancels call.
> Initial CANCEL:
>
> *CANCEL* sip:0919082171 at XXXXXXX SIP/2.0
> Via: SIP/2.0/UDP 31.172.143.70;rport;branch=*z9hG4bKHg59atZ9pDDHg*
> Route: <sip:31.172.143.67:5060>
> Max-Forwards: 68
> From: "2063259" <sip:2063259 at 31.172.143.70>;tag=*N1D0tceygg3tN*
> To: <sip:0919082171 at XXXXXXXX>
> Call-ID: *ed5d0207-9675-1232-e38f-000c29eaa3c3*
> CSeq: 63241643 *CANCEL*
> Reason: SIP;cause=487;text="ORIGINATOR_*CANCEL*"
> Content-Length: 0
>
> I've simply add
>
> if (is_method("CANCEL")) {
> ...
>     xlog("L_INFO", "CANCEL!");
>     append_hf("X-Hint: CANCEL!\r\n");
>     if (t_check_trans()) {
>         xlog("L_INFO", "CANCEL is in transaction!");
>         t_relay();
>     }
> }
>
> In logs I see:
>
> CANCEL!
> CANCEL is in transaction!
>
> but I can't see appended header to outgoing CANCEL packet.
>
> Outgoing CANCEL is
>
>
> *CANCEL* sip:0919082171 at XXXXXXX SIP/2.0
> Via: SIP/2.0/UDP 31.172.143.67:5060;branch=*z9hG4bKed78.b56ef11.1*
> From: "2063259" <sip:2063259 at 31.172.143.70>;tag=*N1D0tceygg3tN*
> Call-ID: *ed5d0207-9675-1232-e38f-000c29eaa3c3*
> To: <sip:0919082171 at XXXXXXX>
> CSeq: 63241643 *CANCEL*
> Max-Forwards: 70
> Reason: SIP;cause=487;text="ORIGINATOR_*CANCEL*"
> User-Agent: OpenSIPS (1.11.2-notls (x86_64/linux))
> Content-Length: 0
>
>
>
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