public void MuteAudioIn()
{
System.Diagnostics.Debug.WriteLine("audio muted");
RTCMediaStream localStream = _peerConnection.LocalStreams[0];
defaultAudioTrack = localStream.AudioTracks[0];
localStream.RemoveAudioTrack(defaultAudioTrack);
_peerConnection.RemoveStream(localStream);
_peerConnection.AddStream(localStream);
}