| |||
| double tone multiple frequency; dual-tone multi-frequency | |||
|
multifrequence en code 2 : 4 Phrasen in 2 Thematiken |
| Informationstechnik | 1 |
| Kommunikation | 3 |
| |||
| double tone multiple frequency; dual-tone multi-frequency | |||
|
multifrequence en code 2 : 4 Phrasen in 2 Thematiken |
| Informationstechnik | 1 |
| Kommunikation | 3 |