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Direct Distance Dialing: Telecommunication, Telecommunications network, Vertical service code, Calling party, Telephone operator, User (telecommunicat
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| Please note that the content of this book primarily consists of articles
available from Wikipedia or other free sources online. Direct Distance
Dialing (DDD) or direct dial is a telecommunications term for a
network-provided service feature in which a call originator may, without
operator assistance, call any other user outside the local calling area.
DDD requires more digits in the number dialed than are required for
calling within the local area or area code. DDD also extends beyond the
boundaries of national public telephone network, in which case it is
called International Direct Dialling or International Direct Distance
Dialing (IDDD). DDD is a North American Numbering Plan term considered
obsolete since completing a call in any manner other than direct dialing
became rare. In the United Kingdom and other parts of the Commonwealth
of Nations, the equivalent terms are or were "STD", for subscriber trunk
dialling, and "ISTD" for international subscriber trunk dialling. |
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i.d.R. innert 7-14 Tagen versandfertig
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