Computerized Telephone System (CTS) definition in Computer Security terms:
Definition(s): A generic term used to describe any telephone system that uses centralized stored program computer technology to provide switched telephone networking features and services. CTSs are referred to commercially, by such terms, as: computerized private branch exchange (CPBX); private branch exchange (PBX); private automatic branch exchange (PABX); electronic private automatic branch exchange (EABX); computerized branch exchange (CBX); computerized key telephone systems (CKTS); hybrid key systems; business communications systems; and office communications systems.
Source(s): CNSSI 4009-2015 (CNSSI 5002)
reference: CSRC Glossary