The most common use case for dual-tone multi-frequency technology is its influence on interactive voice response systems (IVR). For this reason, this technology has many benefits for businesses and contact centers with high call volumes. Once identified, the call automatically routes to the desired number and destination.īesides ensuring that your dialed numbers actually place calls, DTMF technology has revolutionized the way users interact with an outgoing call. Once there, the exchange decodes the signals to determine the entire number the user wants to call. The DTMF technology then sends this combined signal over phone wires to the local phone exchange. For example, when you press the number ‘7,’ frequencies 852 Hz and 1209 Hz are combined. When a user presses a key (number or symbol), a tone generates by combining the high and low frequency of the number. Here’s what that looks something like this: The columns have high-frequency signals, and the rows have low-frequency signals. The dual-tone multi-frequency technology assigns 8 different audio frequencies to the rows and columns of a keypad. You can learn more about the history and evolution of DTMF here. signal to your phone company indicating that you want to make a call andĪnd it does this by sending two tones – a high- and low-frequency tone – for every number key pressed.When you press a number key, DTMF sends the following: Dual-tone multi-frequency (DTMF) produces touch tone sounds heard when pressing a number on a phone’s keypad.
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