 |
| |||
| 双音多频 | |||
| |||
| 複頻式訊號 (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| |||
| 双音调多声频; 双音复频 | |||
| אנגלית אוצר מילים | |||
| |||
| Dual Tone Multiple-Frequency (The signaling system used in telephones with touchtone keypads, in which each digit is associated with two specific frequencies) | |||
| |||
| DTMF | |||
