<p></p>
<p>I did mention the commit in question, I can now confirm reading the code that Kamailio is doing DNS NAPTR resolution<br>
on IP addresses, this was not intended but the desired improvement.</p>
<pre><code>commit 28049aafc8dd06c160ce5e7b8d5e4fc728441b0c
Author: Semen Darienko <semen.darienko@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
</code></pre>

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