Dtmf | Key

The Dual-Tone Multi-Frequency (DTMF) Key: The Sound of Modern Telephony

When a DTMF key is pressed, it generates a unique combination of two tones, one from a low-frequency group and one from a high-frequency group. These tones are transmitted over the phone line to the receiving end, where they are decoded and interpreted as a specific key press. dtmf key

To reduce the risks associated with DTMF: The Dual-Tone Multi-Frequency (DTMF) Key: The Sound of