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Dual Tone Multi-Frequency System used by
touch-tone telephones. DTMF assigns a specific frequency (consisting of
two separate tones) to each key so that it can easily be identified by a
microprocessor, so yes DTMF is to blame for never being able to get
through to a human voice whenever you want to speak to your bank or book a
cinema ticket - yep up there with Gatsos.
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