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A vertical service code (VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [1] Some vertical service codes require dialing of a telephone number after the code sequence. On a touch tone telephone, the codes are usually initiated with ...
Ringback number. A ringback number is a telephone number for a telephone line that automatically calls the line that the call was placed from, after the caller has hung up. The typical use of this facility is by telephone company technicians for testing a new installation or for trouble-shooting. [1]
Last-call return, automatic recall, or (on PBX and centrex service) camp-on, is a telecommunication feature offered by telephony service providers to subscribers to provide the subscriber with the telephone number, and sometimes the time, of the last caller. The service may also offer the facility to place a call to the calling party.
In the United Kingdom, telephone numbers are administered by the Office of Communications (Ofcom). For this purpose, Ofcom established a telephone numbering plan, known as the National Telephone Numbering Plan, which is the system for assigning telephone numbers to subscriber stations. Telephone numbers are of variable length.
The Philippines is assigned an international dialing code of +63 by ITU-T. Telephone numbers are fixed at eight digits for area code 02, and seven digits for area codes from 03X to 09X, with area codes fixed at one, two, or three digits (a six-digit system was used until the mid-1990s; four to five digits were used in the countryside). Mobile ...
The presentation of a telephone number with the plus sign indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806. [6]
A telephone number serves as an address for switching telephone calls using a system of destination code routing. [ 1 ] Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.
Unstructured Supplementary Service Data (USSD), sometimes referred to as " quick codes " or " feature codes ", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator 's computers. USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content ...