Direct Distance Dialing was a telephony innovation that enabled subscribers to call long distance numbers (Those outside the local exchange) without having to go though an operator. This article needs to be cleaned up to conform to a higher standard of quality. ... A telephone operator at work on a private switchboard A telephone operator is either a person who provides assistance to a telephone caller, usually in the placing of operator assisted telephone calls such as calls from a pay phone, collect calls (called reversed-charge calls in the UK), calls which...
In some countries, like India, it was referred to as STD, for Subscriber Trunk Dialling until STD came to mean Sexually Transmitted Diseases. Sexually-transmitted infections (STIs), also known as sexually-transmitted diseases (STDs), are diseases that are commonly transmitted between partners through some form of sexual activity, most commonly vaginal intercourse, oral sex, or anal sex. ...
DirectDistanceDialing (DDD) is a telecommunications term for a network-provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area.
DDD requires more digits in the number dialed than are required for calling within the local area or area code.
DDD also extends beyond the boundaries of national public telephone network, in which case it is called International DirectDistanceDialing (IDDD).
Dialing 0 put you in touch with the operator, and dialing 1 begins direct long-distance dialing.
I would like to suggest an alternative approach to the problem, which would preserve the brevity of telephone numbers as seen by most ordinary users of the system, although it would mean that business concerns which recorded telephone numbers of people from all parts of the country would need to modify their databases.
The Extended and Local dialing systems would permit the flexibility to allow dialing numbers with the minimum number of digits: four instead of seven in smaller centers using the Local system, eight (or nine) instead of ten in larger centers for which seven digits are not adequate.
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