Key Telephone Systems

A telephone system that enables a user to directly access outgoing and incoming central office (CO) facilities by simply pushing a button or "key" on a telephone — unlike a private branch exchange (PBX) telephone system, in which this access can to be achieved by dialing an access code. A key telephone set is characterized by having multiple line buttons, a "hold" button and at least one button dedicated for making internal, station-to-station (intercom) calls. Hold and intercom buttons are typically used to place a call on hold so that the call can be "announced" over the intercom line before being distributed to the person for whom the call is intended. See CO and PBX.

Key Telephone System, terminals and equipment that provide immediate access from all terminals to a variety of telephone services without attendant assistance.

A system in which the telephones have multiple buttons representing separate phone lines. Users select external phone and intercom lines directly through these buttons. KTS solutions are less expensive and less flexible than PBX solutions.

Key telephone system. Designed primarily for small and medium businesses requiring from two to 130 multi-functional telephone sets and/or line combinations. The system resides on the customer's premises and can operate either on its own or in conjunction with a Private Branch Exchange (PBX). (See Private Branch Exchange.)

Key Telephone System - A telephone system in which the station sets have multiple keys permitting the user to select outgoing or incoming CO phone lines. You do not have to dial an access code (typically "9") to access CO lines.

Key Telephone System. A private telephone system requiring manual selection of outside lines.