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Unable to set local description in Mozilla Firefox (WebRTC)

I work with the answer to the challenge of Mozilla documentation to answer the call to the WebRTC Mozilla of Firefox 35.0.1 > but every time I try to install a local description to peer connections, it fails.

INTERNAL_ERROR error with message:

Unable to start media channels cause = OK

My code is written in CoffeeScript, but hopefully is easy to read:

_create_answer: =>

  # @param {mozRTCSessionDescription} answer the SDP answer.
  on_answer_success = (answer) =>
    console.log 'Create Answer: OK', answer

  on_local_sdp_success = () =>
    console.log 'Set local SDP (answer): OK'
    @_send_local_sdp answer

  on_local_sdp_failure = (error) =>
    console.log "#{error.name} - #{error.message}"

  console.log '(5) Set local SDP.', @logger.levels.INFO
  @pc.setLocalDescription answer, on_local_sdp_success, on_local_sdp_failure

As you can see, setting up a local description in a peer-to-peer connection is the fifth step. Here are the steps I do before:

  • User media stream request ( navigator.getUserMedia)
  • Set local media stream ( pc.addStream / pc.onaddstream)
  • Install Remote SDP ( pc.setRemoteDescription)
  • (pc.createAnswer)
  • SDP (pc.setLocalDescription)

SDP, Firefox, pc.setLocalDescription:

v=0
o=Mozilla-SIPUA-35.0.1 2330 0 IN IP4 0.0.0.0
s=SIP Call
t=0 0
a=ice-ufrag:c6dc3e0f
a=ice-pwd:8ab875b276043fa2e76effc4fbe77014
a=fingerprint:sha-256 F5:53:7F:74:A4:3E:27:8F:4B:BC:64:37:ED:96:BD:2D:0D:22:49:FB:E5:AF:8C:E7:05:41:5F:EF:7F:F1:D9:A0
m=audio 9 RTP/SAVPF 96
c=IN IP4 0.0.0.0
a=rtpmap:96 opus/48000/2
a=ptime:20
a=sendrecv
a=setup:active
a=rtcp-mux

- ?

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