Reorder tone

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The reorder tone, also known as the fast busy tone, is the congestion tone or all trunks busy (ATB) tone of a public switched telephone network. It varies from country to country; in North America it is a dual-frequency tone of 480 Hz and 620 Hz at a cadence of 0.25 seconds on, 0.25 off; that is two beeps per second. It is used to indicate that an invalid code has been dialed, or that all circuits (trunks) are busy and/or the call is unroutable.[1] A PBX will often also do this for an invalid extension, while an invalid telephone number on the PSTN usually gets the triple special information tone and a recording. Reorder tone is sometimes confused with the busy signal, because they both sound the same only the busy signal's beeping sounds are slower than the reorder tone.
Example of a North American reorder tone
Listen to a reorder tone from North America.
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See also

References

  1. ↑ "NENA Master Glossary Of 9-1-1 Terminology". National Emergency Number Association (NENA). Retrieved 2012-10-05. 


Signalling (telecommunications)
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