The TAPI 3.0 Connection and Media Services whitepaper contains:
SummaryThis white paper provides background for discussing TAPI 3.0 Service Providers (SPs) by reviewing the basics of TAPI 2.x SPs and pointing out the differences and parallels with TAPI 3.0 as they occur, beginning with a review of the TAPI 2.x distributed architecture.
The Windows® operating system Telephony Application Programming Interface (TAPI 3.0) is an evolutionary API providing convergence of both traditional PSTN telephony and IP telephony. IP telephony is an emerging set of technologies that enables voice, data, and video collaboration over existing LANs, WANs, and the Internet. TAPI 3.0 enables IP telephony on Windows 2000 by providing simple and generic methods for making connections between two or more computers and accessing any media streams involved in the connection.
To provide connection and media services, TAPI uses Telephony Service Providers (TSPs) and Media Stream Providers (MSPs), collectively called Service Providers (SPs). This paper reviews Service Providers as they exist in TAPI 2.1, and discusses the enhancements provided in TAPI 3.0.