Key Telephone System

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What Does Key Telephone System Mean?

In enterprise IT, a key telephone system (KTS) is a telecommunications system that converts a single public switched telephone network (PSTN) line into an array of internal business lines. This basic phone system allows users to use various internal lines from a single telephone desktop set.

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Techopedia Explains Key Telephone System

The KTS is often compared to the private branch exchange (PBX) system, which is more complex and sophisticated. In a PBX system, phone trunking allows for one central line to be split into various business lines within a building. Moreover, a PBX system can function as a switch, whereas a KTS cannot; the latter is most often used by companies that do not need a lot of multiline functionalities and features in their internal telephone systems. For example, telecommunications experts may recommend less than 30 users for a company’s KTS solution. A KTS can be used with a telephone handset display to provide additional functionalities and features, such as call waiting or caller ID, for the workplace.

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Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.