<p>The output of <code>kamctl trap</code> does not show any blocked process, the sip workers are listening for network traffic. Either you did the trap command when the blocking didn't happen or something else (e.g.firewall) was blocking the traffic.</p>
<p>I noticed that you have children=2/tcp_children=2, so if you have a lot of sip traffic over tcp/tls/wss, set tcp_children to a higher value in order to be able to cope with (e.g., 32).</p>
<p>I let this still open for a bit, in case someone else want to comment or new details are added, otherwise it will be closed.</p>

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