<p>When upgrading from stretch to buster the kamailio packages aren't upgraded because the 5.3.1+stretch version is greater than 5.3.1+buster:</p>
<pre><code>$ dpkg --compare-versions 5.3.1+stretch gt 5.3.1+buster ; echo $?
0
</code></pre>
<p>The package version should include the release version instead of its codename, e.g. 5.3.1+deb9u1 & 5.3.1+deb10u1 like done for <a href="https://www.debian.org/doc/manuals/developers-reference/pkgs.en.html#upload-stable" rel="nofollow">stable updates</a>:</p>
<pre><code>$ dpkg --compare-versions 5.3.1+deb10u1 gt 5.3.1+deb9u1 ; echo $?
0
</code></pre>

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