Special Information Tones

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1 total messages Started by lauren Tue, 15 Oct 1985 17:37

#58

Author: lauren
Date: Tue, 15 Oct 1985 17:37

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The set of three tones you hear on many recordings these days are
called "Special Information Tones."  They vary for different sorts
of situations (e.g. unassigned number, all circuits busy, etc.)
They use a variety of rather oddball tone frequencies that were
detailed in an issue of BSTJ some years back.

These tones can be used by automated line/trunk testing equipment to 
determine the termination status of calls.

--Lauren--

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