What does DTMF stand for on my phone set up?

Question

Does anybody know what DTMF stands for on my initial phone set up option?it gives me these choices-short,long or off.

Answer 1

Dual Tone Multi Frequency

- the noises you hear when you push the buttons.

- contrary to Pulsed.

Answer 2

DTMF are the tones you get when you press a digit key.

Answer 3

Dual Tone Multiple Frequency

Pressing a button on the keypad of a touch-tone phone generates a pair of tones of specified frequency and duration. The network or the equipment at the other end of the connection (such as a remote control for a phone answering machine, or a telephone interconnect system) detects and interprets these tones. In analog networks, audible tones generated by the network provide the call progress indications to the user. Different tones allow the human ear to interpret the progress of the call. On digital networks (such as PBX or ISDN), the network may send indication messages to the phone to indicate the status of the call, and the phone may generate most tones locally, driven by those messages.