Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!pprg.unm.edu!hc!lll-winken!netsys!vector!telecom-gateway From: tim@Athena.UUCP (Tim Dawson) Newsgroups: comp.dcom.telecom Subject: Re: Cellular Setup Message-ID: Date: 8 Feb 89 14:46:25 GMT Sender: news@vector.UUCP Reply-To: tim@Athena.UUCP (Tim Dawson) Organization: Motorola FSD, NTSC Dallas, Texas Lines: 18 Approved: telecom-request@vector.uucp X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.uucp X-TELECOM-Digest: volume 9, issue 63, message 5 of 8 In article boottrax@csd4.milw.wisc.edu (Perry Victor Lea) writes: > Actually, when I picked up phone conversations over the police scanner >before the call was initiated I heard a series of tones, beeps, and rings. >The call was made and I heard the conversations. I know it was from mobile >phones, nothing can convince me other wise. I know all this since particular >conversations said theat they were in their car, or wherever. What you undoubtably heard was a call placed on an IMTS mobile phone system (the predecessor to cellular) which used a log of in-band tones for signalling and runs typically in the 150 MHz or 400 MHz bands along with the police. IMTS call set up in no resembles cellular call set up, and probably would be easier to defraud, but I cannot say specifically since the details of IMTS setup are not something that I am intimately familiar with. -- ================================================================================ Tim Dawson (...!killer!mcsd!Athena!tim) Motorola Computer Systems, Dallas, TX. "The opinions expressed above do not relect those of my employer - often even I cannot figure out what I am talking about."