From The Free On-line Dictionary of Computing (19 January 2023):
Interactive Voice Response
IVR
<communications> (IVR) <communications> 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.
(1997-09-21)