direct distance dialing

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direct distance dialing

[də¦rekt ¦dis·təns ′dīl·iŋ]
(communications)
A telephone exchange service that allows a telephone user to dial subscribers outside the local area using a standard routing pattern from the local or end office.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Not sexually transmitted disease, but Subscriber Trunk Dialling. You could ring anywhere in Britain, just by putting your finger in the right holes.
TELEPHONE subscribers served by the Middlesbrough exchange were to have the benefits of the subscriber trunk dialling (STD) by 1960, it was announced.
The scheme, called Subscriber Trunk Dialling, was going to be introduced first to 18,000 subscribers in Bristol in December 1958, then 'rolled out' across the country.