Direct distance dialing (DDD) is a telecommunications service feature in North America by which a caller may, without operator assistance, call any other...

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

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...

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...

commenced a customer trial of direct distance dialing (DDD) from this single location in the country. From the customer dialing experience in the Englewood...

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

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

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

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...

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...

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

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

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,...

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

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...

transmitting the direct-current pulses of a rotary dial. Operator Toll Dialing was gradually supplemented and superseded by Direct Distance Dialing (DDD) in the...

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

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...

they gained public recognition with gradual implementation of Direct Distance Dialing in the 1950 and 1960s. Starting with the late 1980s, assignment...

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

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

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

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...

customer-dialed communication in 1951, with the first trial of Direct Distance Dialing (DDD). In 1956, the administration divided the state into two numbering...

signaling system that was in use from the 1970s for International Direct Distance Dialing (IDDD). Internationally it became known as CCITT5 or CC5. It was...

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...

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...

instead of coins. In 1958, CTB inaugurated the first long-distance automatic direct dialing system (DDD) in Latin America between the cities of São Paulo...

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...