| has gloss | eng: The reorder tone, also known as the fast busy tone or the congestion tone, 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 a person has dialed an invalid code, or that all circuits (trunks) are busy and/or their call is unroutable. The easiest way to hear this tone on a standard NANP landline is to pick up the phone and press # (number sign). 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. |