<p>Adding <code>mem_join=1</code> to the config also appears to resolve the issue. Is this something that is enabled by default on 4.4? These two links contradict each other:</p>

<p><a href="https://www.kamailio.org/wiki/tutorials/troubleshooting/memory">https://www.kamailio.org/wiki/tutorials/troubleshooting/memory</a><br>
<a href="https://www.kamailio.org/wiki/cookbooks/4.4.x/core#mem_join">https://www.kamailio.org/wiki/cookbooks/4.4.x/core#mem_join</a></p>

<p>The take-home from this issue report may well just be that I need to PR an update to the docs to make it more explicit why one might want mem_join. Happy to do that.</p>

<p>I saw in the docs the <code>-x</code> parameter was added to 4.4 - this is good news.</p>

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