[OpenSIPS-Users] CANCEL packet modification.

[Igor Olhovskiy]

Change CSeq
It's related to problem to get registering proxy. Means on one side is
"transparent" dialog, on other - need to be auth'ed. While auth (INVITE
- 401 - INVITE (with digest + another CSeq)) you have to change CSeq.

06.08.14 19:41, 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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>

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