WebRTC video / audio call failed 90% of the time on different networks, but got 90% success on the same network

I have created a video chat application using webRTC and a Django feed. My app works 90% of the time when using it on one network, but can't use it on another network. I cannot see the video from the remote when using on a different network.

I used chrome: // webrtc-internals / to track my webRTC response and I got iceconnectionstate: failed when called using a different network

Below is a snapshot taken when I got success on the same network

And after success also it gave addIceCandidateFailed error on the same network, but the video call is working correctly and this error only occurs in chrome but not firefox. Below is a screenshot

Below is my STUN / TUNE server config which is free. I got this from one of the StackOverflow links.

 var peerConnectionConfig = {
        iceServers: [{
                urls: ["turn:173.194.72.127:19305?transport=udp",
                    "turn:[2404:6800:4008:C01::7F]:19305?transport=udp",
                    "turn:173.194.72.127:443?transport=tcp",
                    "turn:[2404:6800:4008:C01::7F]:443?transport=tcp"
                ],
                username: "CKjCuLwFEgahxNRjuTAYzc/s6OMT",
                credential: "u1SQDR/SQsPQIxXNWQT7czc/G4c="
            },
            {
                urls: ["stun:stun.l.google.com:19302"]
            }
        ]
    };

      

        
        
        
      

    

Below is the javascript code for webRTC

$(function() {
    var initiator,pc;
    var isSender = false;
    var peerConnectionConfig = {
        iceServers: [{
                urls: ["turn:173.194.XX.127:19305?transport=udp",
                    "turn:[2404:XXXX:XXXX:C01::7F]:19305?transport=udp",
                    "turn:173.194.XX.127:443?transport=tcp",
                    "turn:[2404:XXXX:XXXX:C01::7F]:443?transport=tcp"
                ],
                username: "XXXXXXXXXX",
                credential: "YYYYYYYYYYY"
            },
            {
                urls: ["stun:stun.l.google.com:19302"]
            }
        ]
    };
    $.ajax({
        type: "GET",
        url: '/isRoomExist/?roomName=121' ,
        beforeSend: function() {},
        success: function(data) {
            data = JSON.parse(data);
            initiatorCtrl(data[0].flgInitiator);
        }
    });
    var ws_scheme = window.location.protocol == "https:" ? "wss" : "ws";
    var chatsock = new ReconnectingWebSocket(ws_scheme + '://' + window.location.host + "/chat" + window.location.pathname);

    function initiatorCtrl(event) {
        if (event == "fullhouse") {
            alert("full house");
        }
        if (event == "initiator") {
            initiator = false;
            init();
        }
        if (event == "not initiator") {
            initiator = true;
            init();
        }
    }

    function init() {
        var constraints = {
            audio: true,
            video: true
        };
        getUserMedia(constraints, connect, fail);
    }

    function connect(stream) {
        pc = new RTCPeerConnection(peerConnectionConfig);

        if (stream) {
            pc.addStream(stream);
            $('#local').attachStream(stream);
        }

        pc.onaddstream = function(event) {
            $('#remote').attachStream(event.stream);
            logStreaming(true);
        };
        pc.onicecandidate = function(event) {
            if (event.candidate) {
                chatsock.send(JSON.stringify(event.candidate));
                isSender = true;
            }
        };
        if (initiator) {
            createOffer();
        } else {
            log('waiting for offer...');
        }
        logStreaming(false);

        chatsock.onmessage = function(event) {
            var signal1 = JSON.parse(event.data);
            var signal = JSON.parse(signal1);

            if (isSender) {
                isSender = false
            } else {
                if (signal.sdp) {
                    if (initiator) {
                        receiveAnswer(signal);
                    } else {
                        receiveOffer(signal);
                    }
                } else if (signal.candidate) {
                    pc.addIceCandidate(new RTCIceCandidate(signal));
                }
            }
        };
    }

    function createOffer() {
        pc.createOffer(function(offer) {
            pc.setLocalDescription(offer, function() {
                chatsock.send(JSON.stringify(offer));
                isSender = true;
            }, fail);
        }, fail);
    }

    function receiveOffer(offer) {
        pc.setRemoteDescription(new RTCSessionDescription(offer), function() {
            pc.createAnswer(function(answer) {
                pc.setLocalDescription(answer, function() {
                    chatsock.send(JSON.stringify(answer));
                    isSender = true;
                }, fail);
            }, fail);
        }, fail);
    }

    function receiveAnswer(answer) {
        pc.setRemoteDescription(new RTCSessionDescription(answer));
    }
    function log() {
        console.log(Array.prototype.join.call(arguments, ' '))
        console.log.apply(console, arguments);
    }
    function logStreaming(streaming) {
        $('#streaming').text(streaming ? '[streaming]' : '[..]');
    }
    function fail() {
        console.error.apply(console, arguments);
    }
    jQuery.fn.attachStream = function(stream) {
        this.each(function() {
            this.src = URL.createObjectURL(stream);
            this.play();
        });
    };


});