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Direct Dial Central Office (Opposite of DID) US DDD: Direct Distance Dialing: US DDI: Direct Dialing In: UK DECT: Digital Enhanced Cordless Telecommunications DID: Direct Inward Dialing: US DMS: Digital Multiplex System (e.g. DMS-100) Can DNIS: Dialed Number Identification System: US DSL: Digital subscriber line DTMF: dual-tone multi-frequency FDM
The first direct-dialed long-distance telephone calls were possible in the New Jersey communities of Englewood and Teaneck.Customers of the ENglewood 3, ENglewood 4 and TEaneck 7 exchanges, who could already dial telephone numbers in the New York City area, could place calls to eleven major cities across the United States by dialing the three-digit area code and the seven-digit directory number.
Direct distance dialing, where a caller may call any other user outside the local calling area without operator assistance; Direct inward dialing, where an outside call may be automatically routed to an extension through a private branch exchange; International direct dialing, where a caller may place an international call without operator ...
Local telephone numbers were lengthened to a standard seven digits in all of the largest markets in 1958 to accommodate US-style direct-dial equipment (Montréal and Toronto previously had 2L+4N six-digit local calling; smaller communities had four or five digits).
A mobile dial code (MDC) is a phone number, typically preceded by a * or #, that allows the request and receipt of information directly to a mobile phone. MDCs are also known in carrier terminology as "abbreviated dialing codes" (ADCs). Mobile dial codes are dialed just like a regular telephone number.
The outgoing service from a PBX to a central office exchange, corresponding to DID, is direct outward dialing (DOD) or direct dial central office (DDCO). This service is often combined with DID service and allows direct dialing of global telephone numbers by every extension covered by the service without the assistance of an operator.
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Area code handbook issued by many telephone companies in 1962 to promote the newly introduced direct distance dialing. From the Bell System's beginnings in 1876 and throughout the first part of the 20th century, telephone networks grew from essentially local or regional telephone systems.
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