Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!decwrl!ucbvax!hplabs!hpfcdc!hpislx!hplvli!rar
From: rar@hplvli.HP.COM (Ray Robertson)
Newsgroups: sci.electronics
Subject: Re: How can I restrict outgoing phone calls?
Message-ID: <920001@hplvli.HP.COM>
Date: 18 May 89 18:47:58 GMT
References: <778@tetons.UUCP>
Organization: Loveland Inst. Div
Lines: 4


    In some areas the polarity of the line switches on any toll call.
Putting a diode in series with the phone line will terminate a toll
call while allowing local calls.  Cost about $.05.