Encyclopedia > Direct distance dialing

  Article Content

Direct distance dialing

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



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Charles V, Holy Roman Emperor

... of Yuste[?] and is thought to have had a nervous breakdown. He died in 1558. Preceded by:Maximilian I, Holy Roman Emperor List of German Kings and ...

 
 
 
This page was created in 22.3 ms