A private automatic branch exchange (PABX) is an automatic telephoneswitching system within a private enterprise. A private automatic branch exchange (PABX) is an automatic telephone switching system within a private enterprise. Origi-nally, such systems - called private branch exchanges (PABX) - required the use of a live operator. Since almost all private branch exchanges today are automatic, the abbreviation "PABX" usually implies a "PABX." 

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