British telephone sockets were introduced in their current plug and socket form on 19 November 1981 by British Telecom to allow subscribers to connect their own telephones. The connectors are specified in British Standard BS 6312. Electrical characteristics of the telephone interface are specified by individual network operators, e.g. in British Telecom's SIN 351. Electrical characteristics required of British telephones used to be specified in BS 6305.
They are similar to modular connectors (as used in RJ11), but feature a side-mounted hook, rather than a bottom-mounted one, and are physically incompatible.
Read more about British Telephone Sockets: History, Plugs, Connector On Phone, Use in Other Countries, Making The Connections, Cabling Arrangements, Broadband, Structured Cabling (RJ45 Wiring), Socket and Adapter Gallery
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—Henry Noel, British poet, and William Strode, British poet. Beauty Extolled (attributed to Noel and to Strode)
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