<p>Have you tried with trace mode 1?</p>

<ul>
<li><a href="http://www.kamailio.org/docs/modules/stable/modules/siptrace.html#siptrace.p.trace_mode">http://www.kamailio.org/docs/modules/stable/modules/siptrace.html#siptrace.p.trace_mode</a></li>
</ul>

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