<h3>Description</h3>
<p>rtpengine module is hijacking the DTLS key</p>
<p>rtpengine_manage("DTLS=off")</p>
<p>DTLS=off is a valid command to rtpengine, but the module uses that flag<br>
to set transport as UDP/TLS/RTP/SAVP</p>
<p>Unfortunately even though the transport can be fixed by RTP/SAVP, the lines outputted by rtpengine</p>
<p>a=setup:actpass<br>
a=fingerprint:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
<p>confuse some UACs that were expecting only SDES. FreeSWITCH is affected.</p>
<h3>Troubleshooting</h3>
<h4>Reproduction</h4>
<p>rtpengine_manage("DTLS=off"). tcpdump the traffic between kamailio and rtpengine.<br>
Obseve that there is no DTLS=off key.</p>
<h4>Debugging Data</h4>
<h4>Log Messages</h4>
<h4>SIP Traffic</h4>
<h3>Possible Solutions</h3>
<p>Don't look for DTLS key, let that be passthrough to kamailio</p>
<h3>Additional Information</h3>
<p>5.1.2</p>
<ul>
<li><strong>Operating System</strong>:<br>
Linux CentOS 7.4</li>
</ul>

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