10 Feb
2020
10 Feb
'20
1:25 p.m.
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
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Sebastian Damm
Voice Engineer
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sipgate GmbH