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1-5-7-1 is a family of calling features in the United Kingdom, for residential and business telephone lines and for mobile telephones, that are provided by BT Group and several other telephone service providers. The family is named after the telephone number 1571, the special service number that is used to access it.
This is a list of telephone dialling codes in the United Kingdom and the Crown Dependencies, which adopts an open telephone numbering plan for its public switched telephone network. The national telephone numbering plan is maintained by Ofcom , an independent regulator and competition authority for the UK communications industries.
In telecommunications, a plant test number is a telephone number reserved for use by telephone installers or other workers to test an individual telephone line. Test numbers are typically unlisted. The North American Numbering Plan (NANP) reserves the exchange (central office) prefixes 958 and 959 for plant testing. [1] Central office code 958 ...
A Phone of Our Own: the Deaf Insurrection Against Ma Bell. Washington, D.C.: Gallaudet University Press. ISBN 978-1-56368-090-8. OCLC 59576008. Strauss, Karen Peltz (2006). A New Civil Right: Telecommunications Equality for Deaf and Hard of Hearing Americans. Washington, D.C.: Gallaudet University Press. ISBN 978-1-56368-291-9. OCLC 62393257
The test consists of calling a reverting calling telephone number (ringback number) or a vertical service code with a standard telephone. Upon answering the call, the exchange plays a unique signal tone as a signal for the installer to hangup the telephone. The exchange then places a reverting call to the originating line, causing the telephone ...
A typical lineman's handset integrates an earpiece, a mouthpiece, a dialing interface, and a set of test leads for connecting to the telephone circuit. Originally, lineman's handsets featured a rotary dial , but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use.
The Customer Service System (CSS) of the BT Group (previously British Telecommunications) is the core operational support system for BT, bringing in 70% of income for the company (figures from 1997). BT rolled out CSS nationally in 1989 and provided an integrated system for telephony—order handling, repair handling and billing.
In the early-1990s, mobile, non-geographic and premium rate services had used nine-digit numbers with various codes such as 0402, 0645, and 0898 scattered among the similar-looking geographic area codes such as 0384, 0562 and 0949. The number of available codes for new services was quickly dwindling.