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A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. Typically, the disconnect tone is a few cycles of the reorder, busy, or the off-hook tone (e.g. in US), or between five
In EU countries and those following ETSI (European Telecommunication Standards Institute) recommendations, the cadence is the same as North America, i.e. 0.25 seconds on / 0.25 seconds off, but with a 425 Hz tone. The UK reorder tone uses a 400 Hz tone with a cadence of 0.4 seconds on, 0.35 seconds off, 0.225 seconds on, 0.525 seconds off.
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.
Tone cadence Dial tone A: 425 Hz: continuous Dial tone B: 425 Hz, amplitude modulated by 25 Hz: continuous Dial tone C: 400 Hz + 425 Hz + 450 Hz: continuous Dial tone D: 400 Hz + 425 Hz: continuous Dial tone E: 413 Hz + 438 Hz: continuous Ringback tone A: 425 Hz, amplitude modulated by 25 Hz: 0.4 s on, 0.2 s off, 0.4 s on, 2 s off Ringback tone ...
Low tone, also busy tone, is defined as having frequency components of 480 and 620 Hz at a level of −24 dBm and a cadence of one half second ON and one half second OFF. Reorder tone, also often called fast busy tone, is the same tone, but with a cadence of 0.25 of a second ON and 0.25 of a second OFF. The original plan had two slightly ...
In the United States, the standard "city" dial tone was a 600 Hz tone that was amplitude-modulated at 120 Hz. [3] Some dial tones were simply adapted from 60 Hz AC line current. In the UK, the standard Post Office dialing tone was 33 Hz; it was generated by a motor-driven ringing machine in most exchanges and by a vibrating-reed generator in ...
A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. [ 1 ] [ 2 ] Typically, the disconnect tone is a few cycles of the reorder , busy , or the off-hook tone (e.g. in US), or between five and fifteen seconds of the Number Unobtainable tone (e.g. in UK).
Frequency component 1 is 350 Hz at -19 dBm Frequency component 2 is 440 Hz at -19 dBm There is 1 Cadence Section In this section, The duration is 10 seconds and the tone has only 1 subsections In the only subsection the tone is always on, off for 0 seconds, and composed of both the Frequency components 1 and 2 (350 Hz and 440 Hz)