Tele-Communication (Telecom) Terms Glossary and Dictionary
PABX: Private Automatic Branch Exchange
Private Automatic Branch Exchange (PABX) is an automatic telephone switching system within a private enterprise. Originally, such systems - called private branch exchanges (PBX) - required the use of a live operator. Since almost all private branch exchanges today are automatic, the abbreviation "PBX" usually implies a "PABX."