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ABBREVIATIONS
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4ESS number 4 electronic switching system
5ESS number 5 electronic switching system
AAR Automatic Alternate Routing
ACA Automatic Circuit Assurance
ACD Automatic Call Distribution
ACP action control point (for SDN)
ADPCM adaptive differential pulse-code modulation
ADU asynchronous data unit
AMI alternate mark inversion
APLT advanced private-line termination
ARS Automatic Route Selection
AUDIX Audio Information Exchange
B8ZS binary-8 zero-suppression (line coding)
BCC bearer capability class
BCCOS bearer capability class of service
BEHO best end hop off
BOS bit-oriented signaling
BRI basic rate interface
CAD/CAE computer assisted design/computer assisted engineering
CAS Call Accounting System
Centralized Attendant Service
CCSA common control switching arrangement
AB-1