Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!xylogics!bu.edu!telecom-request From: kendall@coyote.datalog.com (kendall miller) Newsgroups: comp.dcom.telecom Subject: Re: Watch for the COCOT Warning Signs! Message-ID: Date: 9 Mar 91 10:47:12 GMT Sender: news@bu.edu.bu.edu Organization: Datalog Consulting, Tucson, AZ Lines: 35 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 187, Message 6 of 8 One quick way to identify a COCOT, that can be done from a distance, is to see on which side the coin return is located. All "Genuine Bell" payphones that I have come across have the coin return slot on the left bottom. A large number of COCOT's have the coin return on the right side. Unfortunately, there are many COCOT's with coin returns on the left, but if you do see a payphone with it on the right, you can avoid it from the outset. Once you do approach a payphone closely, look for the bell in a circle logo impressed in the lower right hand part of the crome front (I actually did see a few early COCOT's that had this logo with a paper sticker covering it up. I guess this was the first batch of bandits that AT&T churned out for the COCOT market before they had a chance to retool for the crome front). Another check is to blow in the mouthpiece to see if you can hear the sidetone in the earpiece. Most COCOT's have the mouthpiece mike cutoff until the connection is finally made with the called party (and sometimes for an anoyingly long period afterwards). I generally do this check whether or not I know that a payphone is a COCOT just to make sure that I am using working equipment before I risk my money. It seems to me the reason that COCOT's are so funky with respect to locking out the keypad after the call has been made or muting the mike at improper times is to prevent fraud due to dial tone re-origination. If you place a call on a loop start line and stay off-hook after the called party hangs up, the central office will eventually give you back a dial tone, but if you do the same on a ground start line, you will never get a dial tone back (the problem with getting a dial tone back from a COCOT's point of view is a that you could then dial anywhere for free). Why don't COCOT's use ground start lines? Kendall Miller kendall@datalog.com 602-797-8660