audio response unit

In telecommunication, an audio response unit (ARU) is a device that provides synthesized voice responses to dual-tone multifrequency signaling input by processing calls based on (a) the call-originator input, (b) information received from a host data base, and (c) information in the incoming call, such as the time of day. ARUs are used to increase the number of information calls handled and to provide consistent quality in information retrieval.

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amplitude distortion
analog decoding
angular misalignment loss
antenna blind cone
antenna effective area
antenna height above average terrain
antenna noise temperature
aperture to medium coupling loss
apparent power
area broadcast shift
arithmetic overflow

arithmetic shift
arq
articulation score
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attenuation

attenuation constant
attenuator
attribute
audible ringing tone
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audit trail
aurora
authenticator
automated information system
automated information systems security
automatic callback

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automatic data processing
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availability