DTMF Decoder is a very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. It is also used for receiving data transmissions over the air in amateur radio frequency bands. DTMF is used by most PSTN (public switched telephone networks) systems for number dialling, and is also used for voice-response systems such as telephone banking and sometimes over private radio networks to provide signalling and transferring of small amounts of data.
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