title: process_sdp: Can't provide secure audio requested in SDP offer
body: <p>I cannot make a call from Chrome browser to an Asterisk machine in which WebRTC is configured. What should I do? (see details)
  I am getting a warning while calling, i.e <code>WARNING [7087] [C-00000005]: chan_sip.c: 10648 process_sdp: Can't provide secure audio requested in SDP offer</code>.</p>