Using DTMF Input
DTMF is a common form of caller input in IVR applications, and in many cases it is a good idea to design applications that give callers the choice to use either DTMF or speech input.
DTMF input is most commonly used for such purposes as menu navigation, getting a digit string (such as an account number) from the caller, and recognizing a digit pattern.
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A caller enters a specific termination key; for example, the “#” key.
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A specified number of seconds have passed without the caller entering a tone.
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The caller enters a predefined number of tones.
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termchar—The terminating DTMF character for DTMF input recognition.
The default value is “#”. The value of empty string means no terminating DTMF character is defined.
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termtimeout—The terminating timeout to use when recognizing DTMF input.
The default value is “4s”.
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Using DTMF for Menu Navigation
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Receiving Digit String Input
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Using DTMF Grammar