Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: Miguel_Cruz@um.cc.umich.edu
Newsgroups: comp.dcom.telecom
Subject: Re: How Were Telephone Sounds Chosen?
Message-ID: <2008@accuvax.nwu.edu>
Date: 9 Dec 89 18:59:32 GMT
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X-Telecom-Digest: Volume 9, Issue 565, message 4 of 5

Doug Martin (martin@nosc.mil) asked in digest 9.561 about the tone the
phone company blasts out when you leave your receiver off-hook for too
long.
 
As far as I know, it's 1400 Hz + 2060 Hz + 2450 Hz + 2600 Hz
simultaneously, cycled on and off every .1 seconds.


[Moderator's Note: But, I believe his question was, how were these
sounds chosen? Did a committee somewhere listen to various sounds and
choose this as the most appropriate? When and how were they picked?  PT]