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

[Sebastian Damm]

We use 5.2 on the affected systems.

On Mon, Feb 10, 2020 at 4:15 PM Serge S. Yuriev <me at nevian.org> wrote:
>
> 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
>
>
> _______________________________________________
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-- 
Sebastian Damm
Voice Engineer
__________________________________________
sipgate GmbH