Telephony Server Application Programming Interface

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What Does Telephony Server Application Programming Interface Mean?

Telephony server application programming interface (TSAPI) is a computer telephony integration standard that enables telephony and computer telephony integration (CTI) application programming.


The foundation of TSAPI is the European Computer Manufacturers Association’s (ECMA) standard CTI definition of computer-supported telecommunications applications (CSTA).

TSAPI is built with multiple Netware server control commands for call logging, call switching and voice mail. Although similar to the Microsoft/Intel telephony API (TAPI), TSAPI does not require call switching.

Novell and AT&T developed TSAPI to enable third-party control of CTI applications connected to local area networks (LANs). TSAPI is used by telephone system and LAN server data links for multiple phone and computer application controls.

Techopedia Explains Telephony Server Application Programming Interface

TSAPI includes telephony services with the following hardware and software components:

  • CTI link
  • CTI link hardware
  • Switch driver
  • Switch driver interface
  • Telephony services module
  • Telephony server
  • Telephony server library
  • Telephony client library

TSAPI was developed when wide area network (WAN) systems based on dedicated circuit-switched links were popular. Such systems served as data carriers with dedicated endpoint channels. Modern systems separately route data pieces to destination endpoints.

TSAPI is compatible with the following clients:

  • Microsoft Windows 95 and NT
  • Novell NetWare
  • IBM OS/2
  • Apple Macintosh
  • UnixWare

TSAPI is also compatible with the Novell NetWare and Microsoft Windows NT server environments.


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Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.