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DTMF Tones - Long

DTMF Tones - Long
DTMF has generally replaced loop disconnect ("pulse") dialling. Each key you press generates two tones of specific frequencies. So that a voice can't imitate the tones, one tone is generated from a high-frequency group of tones and the other from a low frequency group.

Long versions of DTMF tones as MP3 files to download and to play.
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