Direct distance dialling (DDD) is a US term. In the UK, the equivalent term is "STD", or Subscriber Trunk Dialling.
In telecommunication, a direct distance dialing (DDD) is a network-provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area.
Note 1: DDD extends beyond the boundaries of national public telephone networks.
Note 2: DDD requires more digits in the number dialed than are required for calling within the local area.
Source: from Federal Standard 1037C and from MIL-STD-188
Common misspelling and questions (FAQ)
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