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  2. 1-5-7-1 - Wikipedia

    en.wikipedia.org/wiki/1-5-7-1

    The Answer 1571 service, a cut-down version of BT Group's Call Minder service, allows a calling party to leave messages when the called party is engaged or does not answer within a fixed number of rings. The system allows for the storage of up to 20 messages, each of which can be up to 2 minutes long, for up to 60 days (or 20 days once they ...

  3. Telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    Internet Services metered access, up to and including 10p/minute for BT customers. 0871 1xx xxxx currently unused: 0871 2xx xxxx to 0871 9xx xxxx Up to 8.5p a minute (plus VAT) but fixed (e.g. always 6p/minute or always 8.5p/minute) from BT landline, other providers may charge more; up to 50p a minute from mobiles. 0872 xxx xxxx 0873 xxx xxxx

  4. History of telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/History_of_telephone...

    From landlines other than BT, the call price for 0844 and 0871 numbers is usually higher than from BT landlines as those other operators add their own unregulated markup on top of the revenue share. From mobiles, 080 numbers cost from 10 to 30 pence per minute and calls to 084 and 087 numbers cost up to 50 pence per minute at that time.

  5. Signalling System No. 7 - Wikipedia

    en.wikipedia.org/wiki/Signalling_System_No._7

    For charged calls, dialed digits and charge number digits are outpulsed. SS7, being a high-speed and high-performance packet-based communications protocol, can communicate significant amounts of information when setting up a call, during the call, and at the end of the call. This permits rich call-related services to be developed.

  6. Telecommunications in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_in_the...

    Telecommunications in the United Kingdom have evolved from the early days of the telegraph to modern fibre broadband and high-speed 5G networks. History Company logo on porch of 17 & 19 Newhall Street, Birmingham (former Central exchange) National Telephone Company (NTC) was a British telephone company from 1881 until 1911, which brought together smaller local companies in the early years of ...

  7. GPO telephones - Wikipedia

    en.wikipedia.org/wiki/GPO_telephones

    It had a master station which was a 700 type telephone mounted on a plinth with buttons, 'The Planset 625'. The master station and the extension stations could call and speak to each other and also handle and transfer outside calls. The difference between a Plan 105 and Plan 107 was that the latter had only one extension; the former had two.

  8. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    This plate is fitted by the consumer inside the NTE 5 and reduces interference carried by the 3rd (bell) wire. The reduced interference allows faster broadband speeds - BT claim a speed improvement of up to 1.5 Mbit/s with a theoretical 4 Mbit/s. By November 2009 BT were calling the I-plate a "BT Broadband Accelerator".

  9. Off-hook tone - Wikipedia

    en.wikipedia.org/wiki/Off-hook_tone

    "If you'd like to make a call, please hang up and try again. If you need help, hang up and then dial your operator. This is a recording."). A single burst of off-hook tone is sometimes used to indicate to a party that the call is being transferred, notably at 1-800-BELL-SOUTH (800-235-5768).