public void CallPhone(string phoneNumber)
 {
     var acsNumber = new PhoneNumberIdentifier(phoneNumber, phoneNumber);
     var receivers = new CommunicationIdentifier[] { acsNumber };
     var callOptions = new ACSStartCallOptions
     {
         AudioOptions = new ACSAudioOptions()
     };
     _call = _callAgent.StartCall(receivers, callOptions);
 }
        public void CallEchoService()
        {
            var callOptions = new ACSStartCallOptions();
            var camera = _deviceManager.Cameras.First(c => c.CameraFacing == ACSCameraFacing.Front);
            callOptions.AudioOptions = new ACSAudioOptions();

            //callOptions.AudioOptions.Muted = true;
            var localVideoStream = new ACSLocalVideoStream(camera);
            callOptions.VideoOptions = new ACSVideoOptions(localVideoStream);

            var receivers = new CommunicationIdentifier[] { new CommunicationUserIdentifier("8:echo123") };

            _callAgent.StartCall(receivers, callOptions);
        }