The Microsoft telephony application programming interfaces support the development of communications applications for Microsoft Windows or Windows NT. The telephony interfaces are listed in the following table.
| Interface | Description |
| TAPI 2.x | A C-programming language based API that enables you to implement communications applications ranging from basic modem control to call centers with multiple agents and switches. |
| TAPI 3.x | A COM-based API that merges classic and IP telephony. |
| TSPI | A telephony service provider (TSP) is a dynamic-link library (DLL) that supports communications device control through a set of exported service functions. A TAPI application uses standardized commands, TAPI passes information to the telephony service provider, and the TSP handles the specific commands that must be exchanged with the device. |
| MSPI | A media service provider (MSP) allows an application considerable control over the media for a particular transport mechanism. An MSP is always paired with a telephony service provider (TSP). |
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Build date: 2/28/2008