Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!cs.utexas.edu!sun-barr!texsun!texbell!vector!telecom-gateway From: nvuxr!deej@bellcore.bellcore.com (David Lewis) Newsgroups: comp.dcom.telecom Subject: Re: DTMF Frequencies Message-ID:Date: 10 Aug 89 15:07:51 GMT Sender: news@vector.Dallas.TX.US Organization: Bell Communications Research Lines: 19 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us 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."