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From: nagle@well.UUCP (John Nagle)
Newsgroups: sci.electronics
Subject: Re: Device to determine caller's phone number
Message-ID: <14292@well.UUCP>
Date: 26 Oct 89 18:00:53 GMT
References: <1989Oct23.204225.13207@alberta.uucp> <5006@wpi.wpi.edu>
Reply-To: nagle@well.UUCP (John Nagle)
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 22


       This service is available to local customers in a number of areas,
including Orlando (FL), and parts of NJ.  When provided, the calling number
is transmitted digitally, once, between the first and second rings.  
There is no error recovery, although you could refuse to answer the phone.
There's some controversy over whether and under what circumstances 
unlisted numbers should be transmitted.

       Calling number identification is provided to 800 and 900 number
subscribers right now if they want it.  AT&T is presently having a marketing
push for this service.  The home-shopping people are very excited about
this.  Since 800 and 900 service is purchased from an inter-LATA carrier,
the calling number is already available to the inter-LATA carrier from
all exchanges, a feature that was required to make equal access work.
(Before equal access, all long-distance billing data was captured at the
originating central office.  Now, caller ID is passed to the inter-LATA
carrier, which does its own billing.)

       Incidentally, 800 and 900 subscribers apparently get correct
caller identification for all callers, regardless of listed/unlisted status.

					John Nagle