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Dual-tone multifrequency

A method used by the telephone system to recognise the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, which are decoded by the exchange to determine which key was pressed.

Dual-tone multifrequency

A method used by the telephone system to recognise the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, which are decoded by the exchange to determine which key was pressed.

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16y ago
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15y ago

DTMF is the beeps you hear on a regular land-line telephone when you dial a number. When you set it to DTMF long, it transmits the beep for as long as you hold down the button, and when set to short it transmits all of the tones for the same amount of time. It's also how your phone accesses your voicemail, similar to how an automated phone system says "Press 1 to speak with a customer service representative". Anyways, if you have any questions you can email me at ianyikos@gmail.com. Hope I could help!

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Q: Why should DTMF be set to long on a cell phone What is DTMF short used for?
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