Path: utzoo!attcan!uunet!lll-winken!netsys!vector!nobody From: prindle@NADC.ARPA (Frank Prindle) Newsgroups: comp.dcom.telecom Subject: DTMF vs. Touch-Tone Message-ID: Date: 21 Dec 88 13:44:42 GMT Sender: chip@vector.UUCP Lines: 12 Approved: telecom-request@vector.uucp X-Submissions-To: telecom@bu-cs.bu.edu X-Administrivia-To: telecom-request@vector.uucp X-TELECOM-Digest: volume 8, issue 206, message 6 I'm curious when the term DTMF (Dual Tone Multi Frequency) became synonymous with Touch Tone. As I recall, DTMF once designated the set of dual-tone frequencies used for in-band signaling on long distance trunks, which used a completely different set of tones than Touch Tone, and was always generated within the CO, not by any phone set (well, except for the "blue boxes"). I understand that this signaling technology has pretty much faded out, but didn't realize that TPC now uses the term DTMF to refer to Touch Tone (I can see how DTMF is a generic enough term to cover both, but thought they were historically quite different). Is my memory bad? Sincerely, Frank Prindle Prindle@NADC.arpa