4/4/2023 0 Comments Dtmf meaning![]() Each key press corresponds to two tones - hence the name dual tone - one from the high group and one from the low group. They are divided into a high group and a low group. It is an in-band signaling system this is different than out-of-band systems, such as Signaling System 7.ĭTMF specifies eight different tones. These commands are typically used to dial a phone number to call but can also be used to signal phone control commands or control remote equipment, since the control tones are played on the same channel as the voice signal. Equipment at the other end of the phone line listens to the specific sounds and decodes them into commands. How dual tone multi-frequency works?ĭTMF technology works by having the handset generate tones at specific frequencies and playing them over the phone line when a button is pressed on the keypad. Each key has two tones at specific frequencies. ![]() These tones are transmitted with the voice channel.ĭTMF is used to control automated equipment and signal user intent, such as the number they wish to dial. What is dual tone multi-frequency (DTMF)?ĭual tone multi-frequency (DTMF) is the sounds or tones generated by a telephone when the numbers are pressed.
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