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 isreturned to a calling party to indicate that the call cannot be processed through the network. The tone characteristics vary by country or telephone administrations. In North America it is a dual-frequency tone of 620 Hz and 480 Hz interrupted 120 times per minute at a cadence of 0.25 seconds on, 0.25 off, i.e., two beeps per second.
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| - Tonalité de recomposition (fr)
- Reorder tone (en)
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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 isreturned to a calling party to indicate that the call cannot be processed through the network. The tone characteristics vary by country or telephone administrations. In North America it is a dual-frequency tone of 620 Hz and 480 Hz interrupted 120 times per minute at a cadence of 0.25 seconds on, 0.25 off, i.e., two beeps per second. (en)
- La tonalité de recomposition (aussi appelée tonalité d'occupation rapide ; en anglais, reorder tone, fast busy tone, congestion tone ou all trunks busy tone) est une tonalité de progression d’appel du réseau téléphonique public commuté (RTPC) renvoyée à l’appelant pour indiquer qu'un appel ne peut pas être acheminé à cause de congestion dans le réseau. (fr)
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| - Listen to a reorder tone from Europe. (en)
- Listen to a reorder tone from North America. (en)
- Listen to a reorder tone from the United Kingdom. (en)
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- Reorder tone.ogg (en)
- UKReorderTone.ogg (en)
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| - Example of a British reorder tone (en)
- Example of a European reorder tone (en)
- Example of a North American reorder tone (en)
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| - La tonalité de recomposition (aussi appelée tonalité d'occupation rapide ; en anglais, reorder tone, fast busy tone, congestion tone ou all trunks busy tone) est une tonalité de progression d’appel du réseau téléphonique public commuté (RTPC) renvoyée à l’appelant pour indiquer qu'un appel ne peut pas être acheminé à cause de congestion dans le réseau. La tonalité est utilisée pour indiquer que l'appel ne peut être acheminé, soit parce que tous les circuits (lignes réseau) sont occupés, que le numéro appelé est hors service, que le routage de l'appel est impossible ou qu'un code invalide a été composé. De nombreuses compagnies de téléphone en Amérique du Nord et au Royaume-Uni émettent cette tonalité après la diffusion d'une annonce enregistrée expliquant la raison de l'échec de l'appel, généralement lorsque la partie appelée n'accepte pas l'appel après plusieurs minutes. (fr)
- 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 isreturned to a calling party to indicate that the call cannot be processed through the network. The tone characteristics vary by country or telephone administrations. In North America it is a dual-frequency tone of 620 Hz and 480 Hz interrupted 120 times per minute at a cadence of 0.25 seconds on, 0.25 off, i.e., two beeps per second. In EU countries and those following ETSI (European Telecommunication Standards Institute) recommendations, the cadence is the same as North America, i.e. 0.25s on / 0.25s 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 some instances the Number Unobtainable Tone may be used instead. This is a continuous, uninterrupted 400 Hz tone. The signal is used to indicate that the destination is unreachable, either because all circuits (trunks) are busy, the called number is out of service, the call is unroutable, or sometimes that an invalid code has been dialed. A PBX also often indicates an invalid extension, while dialing an invalid telephone number on the PSTN usually results in playing the triple special information tone and a recorded announcement. Some European networks may return the reorder tone as a generic error signal for invalid or incorrect numbers or where a particular call type is not supported or has been barred. Some switches, notably in Europe where open dial plans are used, analyse a number as it's dialled may even return a reorder tone before the complete number is dialled if the initial sequence of digits are invalid. Many telephone companies in North America and in the United Kingdom play the reorder tone after the reading of a recorded announcement explaining the reason of call failure. The reorder tone is sometimes confused with the busy signal because they use the same frequencies and differ only in that the busy signal's beeping sounds have a slower cadence than those of the reorder tone. (en)
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