[sr-dev] [kamailio/kamailio] Kamailio does not update CSeq from 200OK on (#752)

[vinzens]

We've installed latest kamailio from master branch and we see an issue with CSeq numbers.

Scenario is as follow:
A <-> Kamailio <-> B
We do use uacreg to register to B from kamailio. If there is an call from A to B via Kamailio, B challenge DA and from that point the CSeq is not equal on both sides. We do use dlg_manage to track the Difference.

While establishing the call it works until the ACK as reply to 200 OK. The ACK is the first message the CSeq is not updated anymore. In X_log I can see the $dlg_var(cseq_diff) is still there and gives the correct difference. It seems it is not used anymore.

All following requests / responses do have this issue e.G. Bye.

I can provide a wireshark trace, Logs and I can reproduce it in our test lab. Let me know if you need anything.

We do use the latest master version because we had this issue:
https://github.com/kamailio/kamailio/issues/679

unfortunately we were not able to find any commit in 4.4 branch, so we tried master. (would be fine for us, if we would get it run)

cheers
Jöran

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