| Subject | English | German |
| commun. | camp on busy | warten auf Freiwerden (einer Leitung, line) |
| commun. | camp-on busy | Warten |
| telecom. | camp-on busy | Warten auf Freiwerden |
| commun. | camp-on busy button | Rückruftaste (f.tel.) |
| commun. | camp-on to a busy subscriber | Rückruf |
| commun. | camp-on-busy | Rückruf (waiting for the line to become available) |
| commun. | camp-on-busy | Anrufwiederholung |