Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: boulder!boulder!bobk@ncar.ucar.edu (Robert Kinne) Newsgroups: comp.dcom.telecom Subject: Re: Touchtone History Message-ID: <9618@accuvax.nwu.edu> Date: 11 Jul 90 17:41:24 GMT Sender: news@accuvax.nwu.edu Reply-To: Robert Kinne Organization: University of Colorado, Boulder Lines: 18 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 475, Message 7 of 9 In article <9569@accuvax.nwu.edu> Jim Budler writes: >It was probably a Department of Defense phone. These phones looked >like touch-tone, made noises *similar* to touch-tone, but were on the >private DOD Autovon network. They were not pulse dialers. To my >uneducated ear they were DTMF, but they were definately tone dialers. >They had four extra keys for setting call priority. We had a similar Autovon phones had (have still, as far as I know) a 4x4 key matrix instead of the 4x3 on conventional DTMF. Used in normal mode, Autovon phones have the same sets of frequencies that normal DTMF uses. The fourth column provides four levels of priority, and uses an additional tone making four new DTMF combinations. If memory serves, Autovon was linked to the public network, but also had dedicated private trunks to be used for priority calls. All of this may be out of date, since my information is a few years old.