Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. [1]

Dual tone multi-frequency (DTMF) is the sounds or tones generated by a telephone when the numbers are pressed. These tones are transmitted with the voice channel. DTMF is used to control automated equipment and signal user intent, such as the number they wish to dial. Each key has two tones at specific frequencies.

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DTMF is used in ham radio in applications such as IRLP and Echolink, as a means to dial outside numbers via phone patch and as a means for repeater owners to configure the system remotely. It is sometimes known as tone dialing and allows the user to send a series of tones that activate or disable a remote repeater or service.

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DTMF Meaning: What Is DTMF and How Does It Work? In the 1950s, the Bell System, led by AT&T, began research into different transmission methods for dialing phone numbers and connecting phone calls. A method they developed, called MF (multi-frequency) signaling, was so successful in connecting distant telephone exchanges for long-distance calls ...

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