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![]() ![]() There are four low-frequency tones which correspond to each row of keys, and three high-frequency tones which correspond to each column. One of these tones is a low-frequency tone the other is a high-frequency tone. Each sound is actually two tones played simultaneously. DTMF does more than just let you know that you pressed a key.Įach key has its own sound. This is the technical term for the sounds you hear when you press the keys on your telephone. DTMF stands for Dual-Tone Multi-Frequency. |