Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!motcsd!dms!albaugh
From: albaugh@dms.UUCP (Mike Albaugh)
Newsgroups: sci.electronics
Subject: Re: How can I restrict outgoing phone calls?
Message-ID: <773@dms.UUCP>
Date: 19 May 89 22:37:49 GMT
References: <920001@hplvli.HP.COM>
Organization: Atari Games Inc., Milpitas, CA
Lines: 24

From article <920001@hplvli.HP.COM>, by rar@hplvli.HP.COM (Ray Robertson):
> 
>     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.

	It is much more common for polarity to reverse on any _completed_
(i.e. answered) call. The fact that you do not get reversal on, e.g.
(312)555-1212 or "your call cannot be completed as dialed" is accomplished
by _not_ indicating "off hook", while allowing conversation. In any case,
battery reversal is rare and getting moreso, since it makes it too easy
on people who would otherwise have to pay a telco for billing or toll-
restriction :-(

	I would suggest moving this to comp.dcom.telcom, where toll
restrictors are discussed as a regular feature.

| Mike Albaugh (albaugh@dms.UUCP || {...decwrl!turtlevax!}weitek!dms!albaugh)
| Atari Games Corp (Arcade Games, no relation to the makers of the ST)
| 675 Sycamore Dr. Milpitas, CA 95035		voice: (408)434-1709
| The opinions expressed are my own (Boy, are they ever)

( I do not now, nor have I ever, worked for a telco, but I uhhh, _studied_
them extensively in my long-ago youth....)