Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!kitty!larry
From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: sci.electronics
Subject: Re: How can I restrict outgoing phone calls?
Summary: DTMF service
Message-ID: <3264@kitty.UUCP>
Date: 29 Jun 89 02:59:55 GMT
References: <43afec9f.16321@apollo.COM> <25535@agate.BERKELEY.EDU> <8522@cadnetix.COM>
Organization: Recognition Research Corp., Clarence, NY
Lines: 45

In article <8522@cadnetix.COM>, rusty@cadnetix.COM (Rusty Carruth) writes:
> Hi, Larry.  My only question is why then do some people have DTMF
> access who never asked nor paid for it?  Software bug? :-)

> ->1.	In the comparatively few SxS CO's which were converted to DTMF
> ->	...., only DTMF customers were assigned to linefinder
> ->	groups so equipped.

	Very few SxS CO's were actually converted, and interesingly enough
most of the conversion apparatus which I am aware of in BOC CO's was
manufactured by ITT, and not WECO.  In any event, with this type of apparatus
there was no class of service wiring option other than physical linfinder
assignment.  The only way that "free" DTMF service might have been provided
was: (1) someone screwed up and assigned the customer line to a linefinder
group equipped with the DTMF register-sender converters; or (2) lines were
getting scarce in the CO, and the DTMF linefinder groups were the only ones
available.

> ->2.	In #1 and #5 Xbar CO's the DTMF class of service was effected by
> ->	assigning DTMF customers to only certain line link frames ...

	The most common cause of "free" DTMF service was line link frame
scarcity, which required assignment to LLF verticals that were recognized
by the marker as permitting DTMF service.  As in the SxS CO's mentioned
above, there was no class of service wiring option on a line by line
basis other than LLF assignment.

> ->3.	In ESS CO's, from day one, DTMF availability was always a parameter
> ->	specification for every subscriber line, and the denial of service
> ->	was therefore accomplished in software.

	Ah, now THIS is software!  In "early" ESS years, a parameter
specification screwup was the only cause of "free" DTMF service.  In more
recent years, there has been a policy in some BOC areas to provide everyone
with DTMF service, and use a traffic monitoring program to see WHO USED IT
and was NOT PAYING FOR IT.  Those who were "caught" using it were sent
letters offering to allow the service to continue for a monthly fee, or
to have it disabled if the customer did not wish to pay.  In this latter
case, allowing "free" service was intentional and somewhat of a marketing
ploy.

<>  Larry Lippman @ Recognition Research Corp. - Uniquex Corp. - Viatran Corp.
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