TAPI is a program interface developed by Microsoft© for telephony applications. It lets you make telephone calls directly from the software and informs you of incoming calls.

An API for connecting a PC running Windows to telephone services. TAPI was introduced in 1993 as a result of a joint development between Microsoft and Intel. The standard supports connections by individual computers as well as LAN connections serving many computers. Within each connection type, TAPI defines standards for simple call control and for manipulating call content. The Telephony Server Application Programming Interface (TSAPI) defines similar capabilities for NetWare servers.

A set of guidelines developed by Microsoft and Intel Corporation for connecting individual PCs directly to telephones. TAPI is designed for small business networks.

The Telephony Application Programming Interface (TAPI) is an API, which enables PCs running Microsoft Windows to use telephone services. Different versions of TAPI are available on different versions of Windows. TAPI was introduced in 1993 as the result of joint development by Microsoft and Intel.