The segfault happens at shutdown, which should be avoided if possible, but it is not relevant for what happens at runtime.
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.
What you have seen in the packet capture? Are the SIP requests replied? Or no response from Kamailio?
Do you have any monitoring tool that may stop kamailio? The signal 15 (TERM) is the usual way to stop an application.
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