This is one of eight Special Information Tones or SITs played before telephone company recorded announcements. They are used to tell automated dialing equipment why the call did not complete.
This tone indicates:
No Circuit - intraLATA - All circuits busy - local office
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== Summary == {{Information |Description=This is one of eight Special Information Tones or '''SITs''' played before telephone company recorded announcements. They are used to tell automated dialing equipment why the call did not complete. ==This tone in