| Subject | English | Italian |
| commun., IT | enhanced telephone user part | sottosistema telefonico esteso d'utente |
| comp., MS | Telephone User Interface | interfaccia telefonica (An interface that is used to navigate the menus of a Unified Messaging (UM) system using DTMF or touchtone inputs) |
| commun. | telephone user part | sottosistema telefonico d'utente |
| commun., IT | transparent to telephone users | trasparente agli utenti telefonici |