title: Kamailio+rtpengine+SIP.js Failed to set remote answer sdp: Called with SDP without DTLS fingerprint
body: <p>I just install Kamailio 4.4.5 + RTPEngine on Ubuntu Server 16.04 </p>
  
  <p>all config copy from <a href="https://github.com/whisk/WEBRTC-to-SIP" rel="nofollow noreferrer">https://github.com/whisk/WEBRTC-to-SIP</a></p>
  
  <p>And using SIP.js latest version to make call between 2 chrome browser.</p>
  
  <p>SIP user register successfully and can using text chat 
  But when User Invite another user any his Accept call, get this error </p>
  
  <p>Failed to set remote answer sdp: Called with SDP without DTLS fingerprint.</p>
  
  <p>How to solve this issue???</p>