Adds a tone to the buffer for recognition against the loaded grammars.
It is possible for a caller to send many simultaneous tones to a DTMF recognition engine which can cause it to take time to process. This processing time can cause the computer that is running the DTMF recognition engine to stop responding in a timely manner, much like a denial of service attack. It is recommended that the application put a limit on the total number of tones sent to a given instance of the DtmfRecognitionEngine class.
// Initialize an instance of the DtmfRecognitionEngine class. DtmfRecognitionEngine dtmfRecognizer = new DtmfRecognitionEngine(); // Create a Grammar object from a file and load it. Grammar grammar = new Grammar("C:\\SampleGrammar.xml"); dtmfRecognizer.LoadGrammar(grammar); // Add some tones. dtmfRecognizer.AddTone(1); dtmfRecognizer.AddTone(2);