According to chapter 7 (Outside Connectivity) of the excellent &quot;Asterisk: The Definitive Guide&quot; (review version online at <a href="http://ofps.oreilly.com/titles/9780596517342/index.html">http://ofps.oreilly.com/titles/9780596517342/index.html</a>), the following enables secure signaling and media paths:<br>
<pre class="programlisting" id="OutsideConnectivity_id36003329"><font style="font-family: arial,helvetica,sans-serif;" size="2">exten =&gt; 1234,1,Set(CHANNEL(secure_bridge_signaling)=1)<br>    same =&gt; n,Set(CHANNEL(secure_bridge_media)=1)</font><br>
</pre>I would assume that setting these channel variables to 0 will disable secure media and signaling.<br>