Direct distance dialing (DDD) is a telecommunications service in North America by which a caller may call any other subscriber outside the local calling...

Direct dialing may refer to: Direct distance dialing, where a caller may call any other user outside the local calling area without operator assistance...

boundaries. Before direct distance dialing (DDD), all long-distance calls were established by special switchboard operators (long-distance operators) even...

Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers...

cities in northeastern New Jersey were dialable in 1951 (and for a few years prior) from Englewood by simply dialing the two letters of the exchange name...

and Canada that paved the way for Direct Distance Dialing (DDD) by telephone service subscribers. Operator Toll Dialing was developed in the early 1940s...

subscribers, but had also the benefit of preparing the nation for Direct Distance Dialing (DDD) by customers years later. The nationwide and continental...

Union as well as some other European and non-European countries. Direct-distance dialing (DDD) was first introduced in areas with common-control switching...

planning for a nationwide numbering plan for Operator Toll Dialing and direct distance dialing (DDD) in the Bell System in the United States in the 1940s...

Mexico City, and Tijuana. In the early development of International Direct Distance Dialing (IDDD), Mexico elected to join World Zone 5, instead of joining...

exist in previous decades, especially in small towns and before direct distance dialing became universal. In the late 1990s, the 7-digit landline numbers...

direct-distance dialing, all-number calling became necessary. Similar developments followed around the world, such as the British all-figure dialling...

select pulse dialing or DTMF dialing. AIOD leads (automatic identified outward dialing) Crossbar switch Dial tone Direct distance dialing (DDD) History...

and Bakersfield to 213. With the preparations for nation-wide direct distance dialing (DDD) in the early 1950s, area code 318 was temporarily used in...

the fifth regional dial switching center for Operator Toll Dialing in the nation, which set the stage for direct distance dialing by customers in the...

also the first area code with Direct Distance Dialing (DDD) service, when in 1951 the first direct-dialed long-distance call was made from Englewood,...

exchanges a long distance apart. Since all calls may be dialled direct today, the term has fallen into disuse. In subscriber trunk dialing, each designated...

comprehensive numbering plan that enabled direct-distance dialing, led to the introduction of all-number dialing in the 1960s. The use of numbers starting...

long-distance calling, by reducing manual labor by switchboard operators. Eventually, it prepared the continent for direct-dialing of long-distance calls...

multi-frequency signaling systems came into use for international direct distance dialing (IDDD) which used the frequency of 2600Hz in line signaling in...

designed for use in Operator Toll Dialing, the reorganization was also a prerequisite for Direct Distance Dialing (DDD) by customers, first implemented...

United States and Canada. in 1958, AT&T delegated area code 809 for Direct Distance Dialing to the Caribbean to begin integration of the Caribbean telephone...

Kenya with IT education and training Direct distance dialing, a method for telephone subscribers to call long-distance numbers without operator assistance...

toll dialing. The state of Florida was a single numbering plan area with area code 305. In 1953, with the development of direct distance dialing, the...

codes. With the build-out of the toll dialing system, and the beginnings of conversion for direct distance dialing by subscribers, AT&T divided the numbering...

decisions and embraced dialed automatic switching. The 1951 introduction of direct distance dialing required automatic transmission of dialed numbers between...

telephone calls. When direct distance dialing (DDD) was introduced in the US, message registers no longer sufficed for dialed telephone calls. The need...

advances, including the N-carrier system, TD microwave radio relay, direct distance dialing, E-repeater, wire spring relay, and the Number Five Crossbar Switching...

code 1, which is dialed as a prefix in the international E.164 telephone numbering plan. The trunk prefix for dialing long-distance calls, across numbering...

Hackettstown, NJ: The Hackettstown Gazette. 1961-07-06. p. 3. Nationwide Direct Distance Dialing (company guide). New Jersey Bell. 1961-03-26. p. 2. "New Jersey...