centrex ctw45268 manual

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Centrex was a PBX-like service furnished by the local telephone company through equipment located in the central office

Centrex features allowed direct inward dialing (DID) to a telephone number and direct outward dialing (DOD) from a number without operator intervention

Centrex is a kind of telephone exchange which refers to a type of business telephone service in the UK, where customers can keep contact with special employees based on extension numbers.