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Traditionally PABX systems catered for companies with a large number of employees and provided more advanced functionality than Commander or key systems. PABXs evolved from the telephone exchanges used by the telephone carriers like BT and Cable and required dedicated equipment rooms to house the central switching equipment. In line with developments in computer technology, the functionality of PABXs has increased dramatically while the size of the main equipment has declined and are now rack mounted with a companys IT servers and associated equipment.
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