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Name |
Code |
Duration |
Frequency |
Duration |
special_information_tones_NC'
11K
Wikipedia
|
No Circuit - intraLATA |
NC' |
380 ms, 380 ms, 380 ms |
985.2 Hz, 1428.5 Hz, 1776.7 Hz |
All circuits busy - local office |
special_information_tones_NC' '
12K
Wikipedia
|
No Circuit - interLATA |
NC' ' |
380 ms, 380 ms, 380 ms |
913.8 Hz, 1370.6 Hz, 1776.7 Hz |
All circuits busy - distant office |
special_information_tones_RO'
11K
Wikipedia
|
Reorder - intraLATA |
RO' |
276 ms, 380 ms, 380 ms |
913.8 Hz, 1428.5 Hz, 1776.7 Hz |
Incomplete digits, internal office or feature failure - local office |
special_information_tones_RO' '
11K
Wikipedia
|
Reorder - interLATA |
RO' ' |
276 ms, 380 ms, 380 ms |
985.2 Hz, 1370.6 Hz, 1776.7 Hz |
Call failure, no wink or partial digits received - distant office |
special_information_tones_VC
11K
Wikipedia
|
Vacant Code |
VC |
380 ms, 276 ms, 380 ms |
985.2 Hz, 1370.6 Hz, 1776.7 Hz |
Unassigned N11 code, CLASS code or prefix |
special_information_tones_IC
11K
Wikipedia
|
Intercept |
IC |
276 ms, 276 ms, 380 ms |
913.8 Hz, 1370.6 Hz, 1776.7 Hz |
Number changed or disconnected |
special_information_tones_IO
12K
Wikipedia
|
Ineffective/Other |
IO |
380 ms, 276 ms, 380 ms |
913.8 Hz, 1428.5 Hz, 1776.7 Hz |
General misdialing, coin deposit required or other failure |
special_information_tones_future_use
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Wikipedia
|
Future Use |
-- |
276 ms, 276 ms, 380 ms |
985.2 Hz, 1428.5 Hz, 1776.7 Hz |
Reserved for future use |
Male Voice: Welcome to the Congers DMS 100 Central Office. Using codes 268, 267, 261, and 979
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