 |
| |||
| dual-tone multiple-frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| Польский тезаурус | |||
| |||
| DTMF | |||
|
| |||
| dual-tone multiple-frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| Польский тезаурус | |||
| |||
| DTMF | |||
