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| English | Bulgarian |
| Microsoft text telephone | текстов телефон на Microsoft (A device that enables the transmission of typed messages over phone lines. These devices typically include keyboards for typing messages to send and display and/or printers to receive messages from one device to another) |
| plain old telephone service | обикновенна стара телефонна услуга (Basic dial telephone connection to the public switched network, without any added features or functions. Until the 1970s, POTS was the only telephone service offered by local telecommunications providers) |
| telephone device for the deaf | телефон за глухи (A device that enables the transmission of typed messages over phone lines. These devices typically include keyboards for typing messages to send and display and/or printers to receive messages from one device to another) |
| Telephone User Interface | телефонен потребителски интерфейс (An interface that is used to navigate the menus of a Unified Messaging (UM) system using DTMF or touchtone inputs) |
| text telephone | текстов телефон (A device that enables the transmission of typed messages over phone lines. These devices typically include keyboards for typing messages to send and display and/or printers to receive messages from one device to another) |
| UM access telephone number | телефонен номер за достъп (A telephone number that points to a hunt group and is the access number for calls that are routed to Unified Messaging servers) |