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

[Sebastian Damm]

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