private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
if (e.Result.Confidence > 0.8F)
{
PlayRecognizedCommandSound();
var command = e.Result.Text.ToLowerInvariant().Substring(callName.Length + 1);
OnSpeechRecognized(new VoiceCommandEvents.SpeechRecognizedEventArgs(command));
}
}