Instruction manual

GLOSSARY
Enhanced Private Switched Communications Service (EPSCS)
A private telecommunications network that provides advanced voice and data telecom-
munications services to companies with many locations.
Extension Number
A 1- to 5-digit number assigned to each voice terminal, certain system groups, data
modules, 510D Personal Terminals, or 515 BCTs within the system. A 1- or 5-digit
extension number is available for Version 2 and Version 3.
External Call
A connection between a system user and a party on the public telephone network or on a
tie trunk.
F
Facility
A general term used for the telecommunications transmission pathway and associated
equipment.
Feature
A specifically defined function or service provided by the system.
Feature Button
A labeled button on a voice terminal or attendant console designating a specific feature.
Foreign Exchange (FX)
A central office other than the one providing local access to the public telephone network.
Foreign Exchange Trunk
A telecommunications channel that directly connects the system to a central office other
than its local central office.
Foreign Numbering Plan Area Code (FNPA)
An area code other than the local area code. The foreign area code must be dialed to
call outside the local geographical area.
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