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From: ra1d+@andrew.cmu.edu (Robert L. Armitage)
Newsgroups: sci.electronics
Subject: Re: DTMF tones
Message-ID: <4afRwrq00WBK01x7o5@andrew.cmu.edu>
Date: 25 Jul 90 18:04:39 GMT
References: <44900010@uxa.cso.uiuc.edu> <44900011@uxa.cso.uiuc.edu> <1202@gold.GVG.TEK.COM>,
	<1990Jul25.125339.1665@focsys.uucp>
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 21
In-Reply-To: <1990Jul25.125339.1665@focsys.uucp>

brad@focsys.uucp (Brad McCloy) asks: <about DTMF>



>  I also came across some undocumented but supposedly valid tones.
>Anyone have an idea or care to guess what they do?
>Fo = 697Hz & 1633Hz
>F  = 770Hz & 1633Hz
>I  = 852Hz & 1633Hz
>P  = 941Hz & 1633Hz

I think that some military stuff has <had?> and extra row on the 
telephone keypad for access to their stuff. Keep those pesky
civilians off the lines and all that, ya know!  <grin>



Buz...
Rob Armitage  Carnegie Mellon University   Pittsburgh, PA
Internet:  ra1d+@andrew.cmu.edu       BITnet:   ra1d+@andrew
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