| Subject | English | French |
| commun., IT | interior private line | liaison poste à poste |
| telecom. | private line | ligne individuelle |
| commun. | private line | liaison spécialisée |
| commun. | private line | ligne d'intérêt privé |
| commun. | private line | ligne privée |
| comp., MS | private line | ligne privée (An additional phone number with a distinct ring tone that cannot be forwarded. A private line allows a person who delegates calls to have a direct, confidential line) |
| telecom. | private line service | service de circuit de télécommunication permanent |
| commun. | private line service | service de ligne directe |
| commun. | private line service | service de ligne privée |
| telecom. | private line service | service de circuit de télécommunication loué |
| commun. | short period private line | période limitée |
| commun. | short period private line | ligne directe |