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RO' SIT
Reorder – intraLATA
VC SIT
Unassigned N11 code, CLASS code or prefix
NC' SIT
No Circuit – intraLATA
IC SIT
Intercept
IO SIT
Ineffective/Other
Future SIT
Future Use (Not Used)
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In telephony, a special information tone (SIT) is an in-band international standard call progress tone consisting of three rising tones indicating a call has failed. It usually precedes a recorded announcement describing the problem. (Full article...)

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