[SR-Users] Same Via Tag for INVITE and ACK on S/L loadbalancer

[Serge S. Yuriev]

Hi

I believe you are using 5.2 or 5.3 series? This tend to work properly on 5.1 series

10.02.2020, 18:10, "Sebastian Damm" <damm at sipgate.de>:
> Hi,
>
> actually, our only problem is handling negative replies. The ACK
> belongs to the same transaction and therefore has to carry the same
> Via branch ID.
>
> Sebastian
>
> On Mon, Feb 10, 2020 at 3:50 PM Yuriy Gorlichenko <ovoshlook at gmail.com> wrote:
>>  ACK for successull response is a new transaction. It has to be different. May be it is better to point provider to this?
>>
>>  On Mon, 10 Feb 2020, 14:26 Sebastian Damm, <damm at sipgate.de> wrote:
>>>  Hi,
>>>
>>>  I stumbled upon an interop problem with a carrier. We have the
>>>  following scenario:
>>>
>>>  Gateway --> Loadbalancer --> Carrier
>>>
>>>  The loadbalancer generates a Via header for each request. But since it
>>>  is stateless, the Via tag is generated for each request. As a
>>>  consequence, the Via tag in the ACK differs from the one in the
>>>  INVITE. And one carrier doesn't handle those ACKs if the Via tag
>>>  differs.
>>>
>>>  Is there a way to force the creation of a "deterministic" Via branch
>>>  tag? For example, building it from a hash over call-id and from-tag or
>>>  something like that?
>>>
>>>  Thanks in advance
>>>  Sebastian
>>>
>>>  --
>>>  Sebastian Damm
>>>  Voice Engineer
>>>  __________________________________________
>>>  sipgate GmbH
>>>
>>>  _______________________________________________
>>>  Kamailio (SER) - Users Mailing List
>>>  sr-users at lists.kamailio.org
>>>  https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>>  _______________________________________________
>>  Kamailio (SER) - Users Mailing List
>>  sr-users at lists.kamailio.org
>>  https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> --
> Sebastian Damm
> Voice Engineer
> __________________________________________
> sipgate GmbH
>
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

-- 
wbr,
Serge