| English | eng-000 |
| phone extension | |
| Deutsch | deu-000 | Apparat |
| Deutsch | deu-000 | Nebenanschluss |
| Deutsch | deu-000 | Nebenstelle |
| English | eng-000 | exchange |
| English | eng-000 | extension |
| English | eng-000 | indoor wiring |
| English | eng-000 | inner line |
| français | fra-000 | ligne interne |
| français | fra-000 | poste |
| 日本語 | jpn-000 | 内線 |
| 한국어 | kor-000 | 교환 |
| русский | rus-000 | внутренняя телефонная линия |