[sr-dev] [kamailio/kamailio] ACK not forwarded in kamailio 5.4.x (#2539)

### Description I notice a test failure when validating Kamailio 5.4.x, and after looking at the SIP traces, Kamailio is does not forwarding the first ACK. However, it does it after receiving a 200 OK re-transmission . ``` 192.0.2.12:5062 192.0.2.24:5060 ──────────┬───────── ──────────┬───────── │ │ │ │ │ │ 200 coco (SDP │ │ <<<──────────────── 200 coco (SDP) │ <───────────────────────────────────────────── │ ACK │ ─────────────────────────────────────────────> │ ACK │ ───────────────────────────────────────────>>> │ │ │ 200 coco (SDP │ │ <<<──────────────── 200 coco (SDP) │ <───────────────────────────────────────────── │ │ │ ACK │ ─────────────────────────────────────────────> │ │ │ ACK │ │ ──────────────────> ``` ### Troubleshooting I did proceed by isolation and ended up concluding that this commit was triggering this behavior. Simply, reverting this commit is fixing the problem. ``` commit 28049aafc8dd06c160ce5e7b8d5e4fc728441b0c Author: Semen Darienko &lt;semen.darienko(a)wildix.com&gt; Date: Sun May 3 12:26:45 2020 +0200 core: dns - use all NAPTR records - enable using of all NAPTR records instead of the first one ordered by priority - GH #2290 ``` I did not look at the code modification and/or anything config specific yet, I will try to find some time to debug. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/2539