![]() First-party drivers are designed to allow applications to monitor and/or control one extension at a time. Some telephone systems only permit one third-party connection at a time. Third-party drivers are designed to allow applications to see and/or control multiple extensions at the same time. Other manufacturers provide drivers that allow the control of a single handset. This is traditionally called "third-party control". ![]() Some manufacturers provide drivers that allow the control of multiple handsets. When controlling a PBX handset, the driver is provided by the manufacturer of the telephone system. TAPI is used primarily to control either modems or, more recently, to control business telephone system (PBX) handsets. It also supports supplementary functions, such as hold, transfer, conference, and call park found in PBX, ISDN, and other telephone systems. It includes basic functions, such as dialing, answering, and hanging up a call. TAPI allows applications to control telephony functions between a computer and telephone network for data, fax, and voice calls. Different versions of TAPI are available on different versions of Windows. The Telephony Application Programming Interface ( TAPI) is a Microsoft Windows API, which provides computer telephony integration and enables PCs running Microsoft Windows to use telephone services.
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