V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IVR
       Interactive Voice Response (CTI)


The Free On-line Dictionary of Computing (30 December 2018):

Interactive Voice Response
IVR

    (IVR)  A telecommunications
   system, prevelant with PBX and voice mail systems, that
   uses a prerecorded database of voice messages to present
   options to a user, typically over telephone lines.  User input
   is retrieved via DTMF tone key presses.

   When used in conjunction with voice mail, for example, these
   systems typically allow users to store, retrieve, and route
   messages, as well as interact with an underlying database
   server which may allow for automated transactions and data
   processing.

   (15 Sept 1997)

   (1997-09-21)