[sr-dev] [kamailio/kamailio] ACK not forwarded in kamailio 5.4.x (#2539)
Julien Chavanton
notifications at github.com
Fri Oct 30 00:09:23 CET 2020
### 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 <semen.darienko at wildix.com>
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.
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