webrtc turn 服务不起作用,局域网可以视频。4g和wifi则不行

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//创建 PeerConnection
function createPeerConnection() {
var pc_config = {"iceServers": [
{'url': 'turn:xxxxxx:3478?transport=udp',
'credential':'simon',
'username':'user'}
]};

        try {
            pc = new RTCPeerConnection(pc_config);
            console.log("*********新建对象************");
            pc.onicecandidate = onIceCandidate;
        } catch (e) {
            console.log("*********cat************");
            try {
                var stun_server = "";
                if (pc_config.iceServers.length !== 0) {
                    stun_server = pc_config.iceServers[0].url.replace('stun:', 'STUN ');
                }
                pc = new RTCPeerConnection(stun_server, onIceCandidate);
                isRTCPeerConnection = false;
                console.log("Created webkitPeerConnnection00 with config \"" + stun_server + "\".");
            } catch (e) {
                alert("Failed to create PeerConnection, exception: " + e.message);
                return;
            }
        }
        pc.onconnecting = onSessionConnecting;
        pc.onopen = onSessionOpened;
        pc.onaddstream = onRemoteStreamAdded;
        pc.onremovestream = onRemoteStreamRemoved;
    }

图片说明](https://img-ask.csdn.net/upload/201811/05/1541414896_916360.png)
//创建 PeerConnection

自己搭建了一个stom 服务器

你这里配置的是UDP，配置TCP试试。
https://blog.csdn.net/CrystalShaw/article/details/80681889