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• 20:55, 11 April 2025 Sarah talk contribs created page Key system (Created page with "A key system is a type of telephone system designed to care for the communication needs of small to medium sized businesses. They offer many more user features than a normal single line telephone set, such as placing a line on hold, multi-line support. intercom service, attended transfer, etc. Unlike standard single-line telephones, which use a single wire pair to connect to a Central Office, key telephones require three wire pairs for each line. The ''talk pair'' is fo...") Tag: Visual edit