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From: nvuxr!deej@bellcore.bellcore.com (David Lewis)
Newsgroups: comp.dcom.telecom
Subject: Re: DTMF Frequencies
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Date: 10 Aug 89 15:07:51 GMT
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X-TELECOM-Digest: volume 9, issue 288, message 2 of 11

In article , ut-emx!rick@cs.utexas.edu
(Rick Watson) writes:
> What are the frequencies of the various tones used for DTMF?

		High Group (Hz)
		1209   1336   1477   1633
Low	697	 1	2      3      A
Group	770	 4	5      6      B
(Hz)	852	 7	8      9      C
	941	 *	0      #      D

A,B,C,D are not currently implemented anywhere, so far as I'm aware.

(Courtesy of, of coures, Notes on the BOC Intra-LATA Networks, 1986...)

--
David G Lewis				...!bellcore!nvuxr!deej

			"If this is paradise, I wish I had a lawnmower."