Working with Grammars > About Grammars in Dialog Designer
	About Grammars in Dialog Designer

One of the basic functions of an interactive voice response (IVR) system is to collect and recognize input from the caller. This input is the form of either spoken voice responses, or touchtone key presses, known as dual tone multi-frequency (DTMF) input. The system uses this input to direct the flow of a call.

A grammar must be used anywhere in a speech application where caller input needs to be collected that the system can process. The exceptions to this rule are those nodes and node items in which you can use built-in DTMF or speech recognition.

See the following sections for information on using grammars:

• Types of Grammars

• Planning and Designing Grammars

• Using Multiple Grammars

• Compatibility and Compliance

• Basic Process of Using Grammars in Dialog Designer

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