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    Mute i.e. disable audio, video or screen track
var localStream = connection.attachStreams[0];
localStream.mute('both');
// or
var firstRemoteStream = connection.streamEvents.selectFirst({ remote: true }).stream;
firstRemoteStream.mute();
// or
var streamByUserId = connection.streamEvents.selectFirst({ userid: 'remote-userid' }).stream;
streamByUserId.mute();
    You can pass "audio", "video" or "both" on "stream.mute" method.