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, <[email protected]> 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
>
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