TAPI

from The Free On-line Dictionary of Computing (8 July 2008)

Telephony Application Programming Interface
TAPI

   <programming, communications> (TAPI, or "Telephone Application
   Program Interface") A {Windows 95} {Application Program
   Interface} enabling hardware independent access to telephone
   based communication.  TAPI covers a rather wide area of
   services from initialising the equipment (e.g. a {modem}) and
   placing a call to {voice mail} or control of a remote
   computer.

   [Telephone or Telephony?]

   (1995-12-05)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

TAPI
       Telephony Application Program Interface (Intel, MS, WOSA, CTI)