Telephone Exchange - In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central office is the physical building used to house inside plant equipment including telephone switches, which make telephone calls "work" in the sense of making connections and relaying the speech information.

Describe how dialed digits are transferred from a subscriber’s telephone to the local exchange

A hotel telephone exchange is the telephone system that allows for calls to be directed to various departments of the hotel staff (housekeeping, room service, reservations, etc.), or to an individual guest room.

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