Hello,

the ACK doesn't get through the branch_route block because it is forwarded in stateless mode. The ACK doesn't have a reply, therefore is not transaction state to be kept for it. You have to apply all the rules you want for the ACK inside the request_route logic. If there is a retransmission of the ACK, again it is not detected, so it will just run again through the same rules in request_route. This is of course for the ACK following the 200ok.

Cheers,
Daniel

June 25, 2019 1:42 PM, "Bandiera, Enrico" <enrico.bandiera@cloud.timenet.it> wrote:

Hi, I'm encountering an issue when relaying late offer ACKs, before relaying I set the branch_route with t_on_branch() but kamailio never enters that route after calling t_relay

I'm keeping the rtpengine module calls inside branch_routes to avoid issues when re-routing in failure routes

I suppose it's something related to ACK packets but I'm not sure what the issue is.

Any hints?

Thanks,

Enrico.

--
Daniel-Constantin Mierla
www.kamailio.org -- www.asipto.com

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