Special Information Tones

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Article #58

#58

From: 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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Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbosgd!ulysses!ucbvax!rand-unix.arpa!vortex!lauren
From: lauren@vortex.UUCP
Newsgroups: fa.telecom
Subject: Special Information Tones
Message-ID: <8510151037.428.0.VT1.00C@vortex.UUCP>
Date: Tue, 15-Oct-85 13:37:06 EDT
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Posted: Tue Oct 15 13:37:06 1985
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