The Electronic Key Telephone System offered most of the features of a PBX, especially the hybrid version
A telephone system is a key component in any office. An office telephone system is typically located centrally for the best use and convenience for everyone.
A Key-line telephone system or key system is a type of phone system that allowed the station user to see and control the calls directly, manually, using lighted line buttons, while a private branch exchange operated in a manner similar to the public telephone system, in the calls were routed to the correct destination by being dialed directly.
A business telephone system is any of a range of a multiline telephone systems typically used in business environments, encompassing systems ranging from small key systems to large scale private branch. A business telephone system differs from simply using a telephone with multiple lines in that the lines used are accessible from multiple telephones, or "stations" in the system, and that such a system often provides additional features related to call handling. Business telephone systems are often broadly classified into "key systems", "hybrid systems", and "private branch exchanges".
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A software system that facilitates the creation and maintenance and use of an electronic database
In older days telephone use a rotary dial but now we use buttons. Also, from the key system, comes the PBX then later on the Virtual PBX or IP PBX system.
http://www.ablecomm.com/telter.html * KTS is the abbreviation for Key Telephone System, often called just a Key System. * The heart (or brain) of a KTS is its KSU (Key Service Unit). Some telecom newbies say Key System Unit. Computer guys often call it a Central Processing Unit, or CPU. Old telecom guys call it a switch. Cardiologists call it a heart. Neurosurgeons call it a brain. * An individual module inside a KSU used to be called a KTU (Key Telephone Unit), but this term is disappearing.
You can't. It is part of the computer system on the vehicle.
that we do not have as much privacy as we would like to have
The key system, includes the bascis. While the PBX system,which is highly functional with features like extensions, call forwarding and many others. The VOIP PBX system is another development with more advanced features than the other two. Desktop call controller, internet fax and many others are among its features. Some of the major types of business telephone systems are: PBX (private branch exchange) KSU (key system unit) KSU-less systems IP PBX Virtual PBX
a key system
a key system