[Freeswitch-users] Kamailio branch changes in VIA header

[Sergey Safarov]

Thanks Jurijs. I will report vendor equpment to fix bug in firmware about
threatment two INVITEs as separate transactions.


пт, 23 сент. 2016 г. в 14:38, Jurijs Ivolga <jurijs.ivolga at gmail.com>:

> Hi Sergey,
>
> Second INVITE is because of retransmission. Probably that why there is 1
> at the end for second INVITE. That makes sense, cause when call is answered
> Kamailio cancel transaction with ID
> z9hG4bK5398.d5b303bd66f82a3f5cf66672ff787b76.1.
>
> Branch parameter is identifying transaction. Bye is separate transaction
> and that why it has different branch parameter. ACK is separate transaction
> too, that why it has different branch parameter too.
>
> Check image below for detailed info about transaction and dialog.
>
>
> http://www.kamailio.org/pub/ser/ser-releases/0.8.12/doc/html/figures/transaction.png
>
> With kind regards,
>
>
> Jurijs
>
> On Fri, Sep 23, 2016 at 2:09 PM, Sergey Safarov <s.safarov at gmail.com>
> wrote:
>
>> Hello gys
>> Could you please help me resolve issue with Kamailio.
>> In attached file call from freeswitch to endpoint via Kamailio proxy.
>> In packets 3 and 4 kamailio sends two INVITES with different branches in
>> "VIA" header for IP 10.21.19.10 ("SIP/2.0/UDP
>> 217.12.247.212;branch=z9hG4bK5398.d5b303bd66f82a3f5cf66672ff787b76.0"
>> and "SIP/2.0/UDP
>> 217.12.247.212;branch=z9hG4bK5398.d5b303bd66f82a3f5cf66672ff787b76.1").
>>
>> Then from endpoint Kamailio gets  100, 180 and 200 messages (packets 5,
>> 6, 8, 9)  with appropriate branches in "VIA" header.
>>
>> Then Kamailio in packet 11 send CANCEL for branch
>> "z9hG4bK5398.d5b303bd66f82a3f5cf66672ff787b76.1"
>> And in packet 13 send "ACK" with new branch "SIP/2.0/UDP
>> 217.12.247.212;branch=z9hG4bK5398.8ba6e3c3c63533fae1ceff3074f476fb.0"
>> In packet 14 endpoint confirms CANCEL of call with branch
>> "z9hG4bK5398.d5b303bd66f82a3f5cf66672ff787b76.1".
>>
>> And then in packet 16 strange message from Kamailio with branch
>> "SIP/2.0/UDP 217.12.247.212;branch=
>> z9hG4bK6398.f0bbae920c6f81401d10d39f23335696.0".
>>
>> Could you suggest correct answer for following questions:
>>
>>    1. are is kamailio incorrectly changes branch values in VIA header;
>>    2. what is RFC numbers where is described proxy behavior for branch
>>    value in "VIA" header.
>>
>>
>> Sergey Safarov
>>
>> Interest page
>> https://andrewjprokop.wordpress.com/2014/03/06/understanding-the-sip-via-header/
>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20160923/430ab94b/attachment.html