key telephone system
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key telephone system[′kē ′tel·ə‚fōn ‚sis·təm]
A telephone system consisting of phones with several keys, connecting cables, and relay switching apparatus, which does not need a special operator to handle incoming or outgoing calls and which generally permits users to select one of several possible lines and to hold calls.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
key systemAn in-house digital telephone system that connects to a number of dedicated system phones. The major difference between a traditional key system and a PBX is that each key system telephone has buttons for outside lines that are dialed directly without having to "dial 9." However, today's key systems are actually hybrids that handle both dialing methods. In addition, they support analog landlines and voice over IP (VoIP) in the same unit.
|A Small Key System|
|Installed in the mid-1990s, this Panasonic DBS key system handled six system phones and four outside lines. It was replaced in 2013 with a system half its size in order to support VoIP lines. Music-on-hold was one of the major reasons for installing the system in the first place.|
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