Telephony Application Programming Interface Version 3.1


The Microsoft Telephony Application Programming Interface (TAPI) version 3.1 is a Component Object Model (COM)-based API that merges classic and IP telephony.

Where applicable

Possible TAPI applications include:

  • Multicast multimedia IP conferencing with quality of service (QOS)
  • Voice calls over the Internet using the H.323 protocol
  • Call center applications capable of tracking multiple agents
  • Basic voice calls on the Public Switched Telephone Network (PSTN)
  • PBX control
  • Interactive voice response (IVR) systems
  • Voice mail

Developer audience

You can write TAPI-enabled applications in many languages, including Java, Visual Basic, and C/C++. Familiarity with COM is required. Development experience with telecommunications or other telephony applications is helpful, but not necessary.

Run-time requirements

TAPI version 3.1 enables development of communications applications for Windows Server 2003 operating systems, Windows XP, and Windows 2000.

In this section



General information about TAPI architecture and components.


Documentation for:


Related topics

Microsoft Telephony Overview
TAPI 2.2
TAPI Service Providers



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