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.