Other areas initially dialled 952 but with the introduction of Subscriber Trunk Dialling it was changed to 80 and later 8081 as more'recorded services'were introduced and was standardised to 123 by the early 1990s.
12.
There is an area code ( " Subscriber Trunk Dialling " or STD code ) starting with a zero and extending for up to five digits; followed by the local phone number of up to seven digits.
13.
Among the criticisms of the new system was the perceived difficulty in remembering telephone numbers, the inability to easily recognise where a telephone number was located and the need for a change so soon after the implementation of subscriber trunk dialling.
14.
Prior to the introduction of Subscriber Trunk Dialling, most Group Switching Centres housed operators in an Auto Manual Centre ( AMC ) who were able to place any calls for subscribers in the local area that could not be directly dialled.
15.
Operators continued to be used after the introduction of Subscriber Trunk Dialling albeit on a reducing basis as direct dialled routings became increasingly available until universal direct dialling between U . K subscribers became available in 1979 via the Trunk Transit Network.
16.
Despite the arrival of subscriber trunk dialling ( automatic long-distance dialing ) in Europe, central offices there continued making and using message registers in the 1970s, designing ones that could register more than one click per second on a trunk call and display five or six digits.
17.
When dialling within the country, all area codes are preceded by the national trunk prefix 0, which has been included in all listings in this article . 0 was traditionally the number dialled for the operator for trunk calls before subscriber trunk dialling ( STD ) was introduced, and so was retained as a prefix for direct dialled calls.
18.
From a single phone line that stretched through the deep jungles of Malaysia a century ago, the infrastructure has progressed to other more sophisticated technologies such as subscriber trunk dialling ( STD ) for mass subscribers to the integrated services digital network ( ISDN ), an optical fibre network that now forms the backbone of the country's future telecommunications needs.
19.
Originally, they referred to UK telephone numbering system used a similar two-letter code after the initial zero to form the first part of the subscriber trunk dialling code for that region for example, Aylesbury was assigned 0AY6 which translated into 0296 . ( The majority of these original numbers have remained, particularly in the rural areas, and are currently still in service.
