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

[Daniel-Constantin Mierla]

It can also have a different path than the INVITE, if there are proxies
that do not do record-route, so there can be less Via headers than in
the INVITE.

By that I am wondering if the ACK relayed via tm module has the same Via
branch as , expecting not to be. Maybe in the ACK for 300+ replies...

Cheers,
Daniel

On 10.02.20 15:48, Yuriy Gorlichenko 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
> <mailto: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
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
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