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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.
The BT Merlin M4000 was a Personal computer sold by British Telecom during the 1980s as part of the Merlin range of electronic machinery for businesses. [1] It was not developed by BT but was a rebadged Logica VTS-2300 Kennet, [ 2 ] and a completely different machine from the Merlin Tonto which was a rebadged ICL OPD .
The system firmware (BFS or "Basic Functional Software") was unrelated to the QL's Qdos operating system, although a subset of SuperBASIC was provided on Microdrive cartridge. The BFS provided application-switching, voice/data call management , call answering, phone number directories, Viewdata terminal emulation and a simple calculator.
There is a serial connection that can be used for call logging and configuration. It can either use standard telephones or proprietary feature phones . A special Door Phone may be added on extension 23 and the system may be connected to an electronic lock relay to allow the door to be opened via a Door Phone call.
Analog equivalents do exist and can provide longer reach, but with potential loss of confidentiality and voice quality. The cordless phone handset connects to a wireless access point or base station that supports the same technology. Also required is a call management function and a gateway to the public switched telephone network (PSTN). This ...
Nortel T7316 Telephone, compatible with newer BCM and older Norstar systems. The Nortel Norstar, previously the Meridian Norstar, was a small and medium-sized business digital key telephone system introduced by Nortel (formerly Northern Telecom) and later sold to Avaya. It featured automatic call distribution, and
Airwave was established in 2000 by BT as BT Airwave. [4] BT Airwave along with BT Quadrant secured a Public Private Partnership (PPP) contract worth £2.5bn to supply of Professional Mobile Radio (PMR) communications to the police and other ‘blue light’ services. [5]
A lineman's handset typically connects via a pair of test leads, not the modular connector found on most consumer telephone equipment. The test leads will feature some combination of alligator clips (to connect to bare wires), a piercing spike or "bed-of-nails" (for insulated wires), and something designed to fit a punch block.
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