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control systems, the director system incorporates two... The telephone numbering plan for the Director System assigned... in small type, e.g. Laindon 2263. In a Director area there were 8...

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features for call handling. Business telephone systems are often broadly classified into key... 3 Home and small-business usage 4.4 PBX functions 4.5 Interface standards 4.6 Hosted PBX...

Public switched telephone network - 위키피디아 영어

central offices, network tandems, and international gateways, which allow telephone users to... Bells were soon added to stations for signaling. Later telephone systems took advantage of...

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