多方视频对话使用skype web sdk在线发布Skype for business

我使用下面的代码来创建对话.

var conversation = app.conversationsManager.createConversation(); //created conversion
//self video listener
conversation.selfParticipant.video.state.changed(function (newState,reason,oldState) {
    notify("selfParticipant.video.state : "+newState)
});
//self audio listener
conversation.selfParticipant.audio.state.changed(function (newState,oldState) {
    notify("selfParticipant.audio.state :"+newState);
});
//listner for conversion state
conversation.state.changed(function (newValue,oldValue) {
    notify("conversation.state : "+newValue)
});

//add participants
addParticipants(conversation,sip_uris); //Added participants

notify("conversation.videoService.maxVideos : "+conversation.videoService.maxVideos());
notify("conversation.videoService.videoMode : "+conversation.videoService.videoMode());
//start video service
conversation.videoService.start().then(function () {
    notify("Video conference successfully started : "+conversation.uri());
},function (error) {
    notify("Video conference start failed : "+error);
});

以上代码的日志如下所示

1:26:51 PM : selfParticipant.video.state : Disconnected
1:26:51 PM : selfParticipant.audio.state :Disconnected
1:26:51 PM : conversation.state : Created
1:26:51 PM : conversation.videoService.maxVideos : null
1:26:51 PM : conversation.videoService.videoMode : ActiveSpeaker
1:26:52 PM : conversation.state : Conferenced
1:26:53 PM : selfParticipant.audio.state :Connecting
1:26:53 PM : selfParticipant.video.state : Connecting
1:27:04 PM : selfParticipant.audio.state :Connected
1:27:04 PM : selfParticipant.video.state : Disconnected
1:27:04 PM : Video conference successfully started

我有两个问题.

> conversation.videoService.maxVideos在chrome()版本56.0.2924.87(64位)上显示为null.
> selfParticipant.video.state获取Disconnected,但selfParticipant.audio.state正常(更改为已连接).

编辑：
Skype Web SDK日志here

任何帮助赞赏.