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Direct outward dialing is called DOD, or Direct Distance Dialing (DDD)

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Direct outward dialing is called DOD, or Direct Distance Dialing (DDD)

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Direct inward dialing is known as DID

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Direct-dialing of long-distance calls began on November 10, 1951, with customers in Teaneck and Englewood, New Jersey, able to direct-dial 11 cities in the United States.

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Direct inward dialing is known as DID

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Direct-dialed long distance started in the United States in 1951, in the UK in 1958, and in India in 1960.

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