Importance

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Abstract

A switching office translates a dialed extension number consisting of fewer digits than the minimum number normally required to identify a destination station into a Centrex number of at least the minimum number of digits. At least for those extension numbers identifying lines connected to a different switching office, the Centrex number triggers a query and response procedure to access data stored in a database in a central control. The accessed data is used to translate the Centrex number into an actual destination number uniquely identifying a particular communication line. The central control returns the destination number to the switching office for use in providing a requested communication service. Call processing methods and communication systems using these translations can extend a number of Centrex features, such as extension number dialing and extension number based call transfer, to a business subscriber's various premises served by different end offices.

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First Claim