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 the USA 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 dialled, 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.
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[edit] See also
[edit] References
- ^ "NENA Master Glossary Of 9-1-1 Terminology". National Emergency Number Association (NENA). http://www.nena.org/sites/default/files/20100929_MG_00-001_V14.pdf. Retrieved 2011-03-18.
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