How to disable and enable video chatting in button click event, but audio is always in both ..

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MVC5

Hello,
we are implementing video chatting between 2persons. here enable/disable buttons is there. when i click enable button video chatting ok, but when click disable button showing error like "

The stream was unable to connect due to a network error. Make sure your connection isn't blocked by a firewall

". pls give some solution on it..

I use the latest opentok Android SDK to development an application. My purpose is to provide a button to let user can publish / unpublish camera. It works to unpublish the camera OT.initPublisher("publisherContainer", publisherOptions).publishVideo(false);, but it doesn't work to republish when I use OT.initPublisher("publisherContainer", publisherOptions).publishVideo(true);.

<script src="//static.opentok.com/webrtc/v2.2/js/opentok.min.js" ></script>

$(document).ready(function () {
        var apikey = "xxxxx";
        var sessionI = "@Session["SessionId"]";
        var token = "@Session["Token"]";
        var videoOn = true;
        var session = OT.initSession(apikey, sessionI);
        
        session.connect(token, function (err) {
            if (err) {
                alert("Vendor  video call disconnected");
            }
            else {
                var publisherOptions = {
                    insertMode: "append",
                    height: "260px",
                    width: "450px",                    
                }
 var publisher = OT.initPublisher("publisherContainer", publisherOptions);
                $('#disablevideo').click(function () {
                    if (videoOn == true)
                    {
                        publisher.destroy();
                        publisher = OT.initPublisher("publisherContainer", publisherOptions).publishVideo(false);
                        videoOn = false;
                        session.publish(publisher);
                        
                    }
                    else {
                        publisher.destroy();
                        publisher = OT.initPublisher("publisherContainer", publisherOptions).publishVideo(true);
                        videoOn = true;
                        session.publish(publisher);
                        
                    }
                });
                session.publish(publisher);
            }
        });
        session.on("streamCreated", function (event) {
            var options = {
                insertMode: 'append',
                height: "450px",
                width: "720px",
            }
            
            session.subscribe(event.stream, 'containerElementId', options)
            $("#vendoename").hide();
            clearInterval(interval);
        });

thank you.