The first commonly used telephony signaling system was pulse dialing. Signalling systems have evolved to fill that role - both for routing and dialing calls as well as for interacting with phone systems once connected. DTMF Tones for Automating Telecommunications InteractionsĪlmost as long as we've had telegraph and telephony systems, humans have needed a way to reliably interact with the system in a mechanical and reproducible way. Commonly used over telephone lines, DTMF tones are also commonly called Touch Tones.
DTMF, or Dual-Tone Multi-Frequency tones, are in-band telecommunications signals sent over voice frequencies.
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