Dual-Tone Multi-Frequency (DTMF) signaling, when described using accessible language, refers to the tones generated when a telephone keypad button is pressed. Each digit or symbol corresponds to a unique pair of high and low frequencies. For example, pressing the ‘1’ key produces a tone comprising frequencies of 697 Hz and 1209 Hz. These tones are transmitted over telephone lines to signal dialing information to telephone exchanges or interactive voice response (IVR) systems.
The significance of this technology lies in its efficiency and reliability for transmitting data across telephone networks. It allows users to interact with automated systems remotely, facilitating services like banking, order entry, and information retrieval. Historically, DTMF superseded pulse dialing, offering faster and more accurate call setup and data transmission, thereby streamlining telecommunications processes significantly.