<p>The segfault happens at shutdown, which should be avoided if possible, but it is not relevant for what happens at runtime.</p>
<p>From the log messages, it seems that you use dispatcher (or some other routing module) and there is no active gateway where the sip request should be sent.</p>
<p>What you have seen in the packet capture? Are the SIP requests replied? Or no response from Kamailio?</p>
<p>Do you have any monitoring tool that may stop kamailio? The signal 15 (TERM) is the usual way to stop an application.</p>

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