wx.invoke('queryCurrHWOpenTalk', {
    }, function(res){
        if(res.err_msg == "queryCurrHWOpenTalk:ok"){
            if (res.inTalkType != "None") {
                // busy
                if (res.inTalkType == "HWOpenTalk") {
                    //res.ticket
                }
            }
        }else {
            //错误处理
        }
});

wx.invoke('enterHWOpenTalk', {
        'code': "",
        'ticket': "",
    }, function(res){
        if(res.err_msg == "enterHWOpenTalk:ok"){
        // 发起加入会议请求成功
        }else {
        // 发起加入会议请求失败
    }
 });