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subscriber trunk dialling
Subscriber trunk dialling (STD, also known as subscriber toll dialling) is a telephone system allowing subscribers to dial trunk calls without operator assistance. The term was introduced when it first became possible for long-distance calls to be dialled directly, and is now rarely used where calls to any destination can be dialled.
== Terminology ==
The term ''subscriber trunk dialling'' is used in the United Kingdom, the Republic of Ireland, Australia, India and South East Asia. The corresponding term in the North American Numbering Plan, e.g., in the United States and Canada, is direct distance dialing.
The term was extended when, on 8 March 1963, subscribers in London were able to directly dial Paris using International Direct Dialling.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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