receiveCall(offerSdp) {
    gSecondConnection = new webkitRTCPeerConnection(null, null);
    gSecondConnection.onicecandidate = onIceCandidateToSecond;
    gSecondConnection.onaddstream = onRemoteStream;

    var parsedOffer = new RTCSessionDescription({ type: 'offer',
                                                  sdp: offerSdp });
    gSecondConnection.setRemoteDescription(parsedOffer);

    gSecondConnection.createAnswer(onAnswerCreated,
                                   failed('createAnswer'));
  };