我无法将WebRTC音轨加载到HTML音频中播放，看起来src源代码没有更新。
你可以在这里找到JSFiddle的实现：https://jsfiddle.net/redvivi/ut3pgcnq/
以下是我们感兴趣的代码部分：

HTML

<audio id="remoteAudio" controls></audio>

JS

function attachRemoteStream(session) {
  // Fetch the existing audio element or create a new one

  session.connection.ontrack = (event) => {
    if (event.track.kind === 'audio') {
      if (event.streams.length > 0) {
        remoteAudio.srcObject = event.streams[0];
      } else {
        const stream = new MediaStream([event.track]);
        remoteAudio.srcObject = stream;
      }
    }
  };
}

phone.on('newRTCSession',function(ev){
    var newSession = ev.session;
    [...]
    session.on('peerconnection', (e) => { // peerconnection is RTCPeerConnection instance
      if(session.direction === 'incoming'){
        attachRemoteStream(session);
        remoteAudio.load();
        remoteAudio.play();        
      } else {
        session.connection.addEventListener('track', function (e) {
          // set remote audio stream
          remoteAudio.src = window.URL.createObjectURL(e.streams[0]);
          remoteAudio.load();
          remoteAudio.play();
        });
      }
    });
  })

我还确认了WebRTC流实际上返回数据（参见下文）

我错过了什么吗？