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From: gabe@sirius.ctr.columbia.edu (Gabe Wiener)
Newsgroups: comp.dcom.telecom
Subject: Dialtone Frequencies
Message-ID: <telecom-v09i0395m09@vector.dallas.tx.us>
Date: 22 Sep 89 20:05:16 GMT
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X-TELECOM-Digest: volume 9, issue 395, message 9 of 12

Does anyone know when the common telephone dialtone (i.e. 350Hz and 440Hz
played together) was adopted?


Gabe Wiener - Columbia Univ.      "This 'telephone' has too many shortcomings
gabe@ctr.columbia.edu              to be seriously considered as a means of
gmw1@cunixd.cc.columbia.edu        communication. The device is inherently of
72355.1226@compuserve.com          no value to us."