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In the United Kingdom, the busy tone is a single 400 Hz tone with equal 0.375 s on/off periods. This was the case even when the UK was still part of the EU. The current 400 Hz/375ms tone was adopted in the mid-to-late 1960s and replaced the older busy tone, which was the same 400 Hz signal but at half the pulse duration, 0.75 s on, 0.75 s off.
For most of the 20th century, calls were usually placed on the public switched telephone network via electromechanical switching equipment.When a caller dialed a number that was busy or permanently unavailable, the central office of their carrier would shunt the incoming call to a circuit on which the busy signal tone was produced.
Up to 4.26p a minute (plus VAT), but fixed (e.g. always 3p/minute or always 4p/minute) from BT landline, other providers may charge more; up to 42p a minute from mobiles. 0843 xxx xxxx 0844 00x xxxx Non-BT Discount Scheme—Internet Services incorporating unmetered access up to and including 5p for BT customers 0844 01x xxxx to 0844 09x xxxx
10 To Replace Saying "I'm Busy," According to Psychologists 1. "I don't have the bandwidth." This phrase has become popular recently, and Dr. Schiff is on board.
The call may use land line, mobile phone, satellite phone or any combination thereof. When a telephone call has more than one called party it is referred to as a conference call. When two or more users of the network are sharing the same physical line, it is called a party line or Rural phone line. U.S. President Gerald Ford on the phone
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Non-unique printed or written overlined character groups, [a] e.g. BT Although some of the prosigns as-written appear to be simply two adjacent letters, most prosigns are transmitted as digraphs that have no pauses between the patterns that represent the "combined" letters, and are most commonly written with a single bar over the merged letters ...