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# DTMF Identification

The `audiopreproc` module can perform DTMF (Dual-Tone Multi-Frequency) dial tone detection and identification. In this mode, the module can accurately detect and identify tones corresponding to the numbers 0-9, the letters A-D, and the asterisk (*) and hash (#) keys.

To enable DTMF dial tone identification, set the `audiopreproc` mode to `T`. For an example schema incorporating DTMF dial tone identification, see Identify DTMF Dial Tones. This schema produces a stream of DTMF labels (such as `<DTMF-1>`, `<DTMF-A>` or `<DTMF-#>`).

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