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d:dtmf [2018/08/10 18:16] (current)
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 +# DTMF
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 +Dual Tone - Multi Frequency (DTMF) is a signalling method for telephone systems, which uses a set of eight audio frequencies transmitted in pairs to represent 16 signals, represented by the ten digits, the letters A to D, and the symbols `#` and `*`.
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