A Key System – also known as a Key Telephone System (KTS) – is a very basic and traditional form of telephony primarily used by small and medium businesses.
Ideal for businesses with less than 30 users, traditional Key Systems include a central controller and multiple telephones. Each telephone has a button for every phone line.
Key Systems have been around in some form since the 1930s, but remain in use today despite new technologies. Many businesses decide to keep their Key System because they are simple and “just work”. By opting out of the VoIP trend, they are missing out on modern features and advantages.
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