kamailio/modules/tcpops/doc/eventroutes.xml

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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [

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]>
<section id="tcpops.ex.event_routes">
    <title>Event routes</title>
    <section>
        <title>
            <function moreinfo="none">tcp:closed</function>
        </title>
        <para>
			This route is called when a socket is closed by the remote party,
			or reset, or timeout. The corresponding <emphasis>$conid</emphasis>
			variable will be available in the event route. 
        </para>
        <para>
			Whether this route is always called, never, or on a per socket basis
			is controlled by the <emphasis>closed_event</emphasis> parameter.
        </para>
        <para>
    		<programlisting  format="linespecific">
...
event_route[tcp:closed] {
    xlog("L_INFO", "TCP connection closed ($conid)\n");
}
...
  	    	</programlisting>
    	</para>
	</section>
</section>