Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!sdd.hp.com!zaphod.mps.ohio-state.edu!casbah.acns.nwu.edu!nucsrl!telecom-request From: covert@covert.enet.dec.com (John R. Covert 07-Mar-1991 1939) Newsgroups: comp.dcom.telecom Subject: Re: Rotary Dial for Cellular Telephones? Message-ID: Date: 9 Mar 91 07:25:14 GMT Sender: news@casbah.acns.nwu.edu (Mr. News) Organization: TELECOM Digest Lines: 22 Approved: Telecom@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 188, Message 7 of 10 Originator: telecom@delta.eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu Nntp-Posting-Host: hub.eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu Steve Pershing asks: > Since many telcos (at least here in NorthAm) charge extra for > Touch-Tone dialling, I wonder if cellular users couldn't request > rotary dialling to reduce their charges? :-) Why not? :-) Because North American cellular phones do not use Touch-Tone. Although most phones have a Touch-Tone pad built in to the phone for use after the connection is established, the keypad on the phone does not send Touch-Tone to the cellular switch. Communications with the switch for signalling and control is done over a modem channel. > Moderator's Note: Rotary dial will NOT work on cellular phones, since > there is no loop of wire to be opened and closed by the pulsing. Rotary dial worked just fine on IMTS mobile phones; this was accomplished by causing each dial pulse to be transmitted as a short tone, interpreted and counted by the IMTS mobile switch. john