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The reorder tone, also known as the fast busy tone, or the congestion tone, or all trunks busy (ATB) tone is an audible call progress tone in the public switched telephone network (PSTN) that is returned to a calling party to indicate that the call cannot be processed through the network.
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.
The telephone operator may also be able to assist with determining what kind of technical difficulties are occurring on a phone line, to verify whether a line is busy (busy line verification, or BLV), or left off the hook, or to break in on a live call to ask the caller to clear the line for an incoming call (busy line interruption, or BLI). [1]
In the United Kingdom, a warbling signal sounding rather like an alarm siren is played at steadily increasing volume to a telephone left off-hook and unused on telephone lines provided by the BT Group and many PABX extensions. It is sometimes referred to as a howler. In some cases it is composed of the DTMF tones * and # played alternately.
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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.
As central offices did not send answer supervision to busy signals, conversations hosted over these so-called "beep lines" were toll-free in most cases. [3] A common point of discovery for the beep line back in the 1950s and 1960s were call-in segments of radio programs.
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