| |||
äänitaajuusvalinta (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies); DTMF (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
Inglés tesauro | |||
| |||
Dual Tone Multiple-Frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| |||
DTMF |