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

[Sebastian Damm]

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