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From: jr@LF-SERVER-2.BBN.COM (John Robinson)
Newsgroups: comp.dcom.telecom
Subject: Re: all this new stuff has been confusedly presented
Message-ID: <231@lf-jr.BBN.COM>
Date: Fri, 9-Oct-87 12:46:07 EDT
Article-I.D.: lf-jr.231
Posted: Fri Oct  9 12:46:07 1987
Date-Received: Sat, 17-Oct-87 11:26:02 EDT
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In article  <12340678224.21.AWALKER@RED.RUTGERS.EDU> AWalker@RED.RUTGERS.EDU (*Hobbit*) writes:
>Okay, my recent reading of Telecom has raised many questions.  Could some
>persons who know provide the following info:
>
>Is this new "ID the caller" beta-test service handled by / the same as /
>utterly unrelated to / etc ISDN?
>
>Exactly, and by this I mean electrically down to the bit level, how does
>the beta-test service [I forget its name offhand] work?  How is the number
>of the caller passed to the recipient's equipment, and what is required on
>the called end to display it?  [I'm thinking "build my own" here...]
>
>It seems to me that for this service to work the caller must be in an office
>where the service is being tested too.  Present ["normal"] offices wouldn't
>have the capability to pass a packet containing the caller's number to the
>destination end, right?  Is this packet the same kind of thing an office
>passes to a TSPS on 0+ calls?  Grubby internal details, please??
>
>And finally, where is the documentation for ISDN protocols located?
>
>_H*
>-------

This is something that comes under the ISDN service umbrella probably.
The protocols are specified in the ISDN standards, CCITT I.xxx series
of standards in the 1984 Red Book, plus possible draft iprovmenets for
the 1988 book.  The information on calling number is probably passed
in signalling system #7 (SS#7) out-of-band data packets; this system
is an outgrowth of internal Bell protocols and now will be public
worldwide in ISDN systems.

SS#7 (or its predecessor in the U. S., CCIS) probably already provides
the calling party's identification to the callee's central office; all
that was missing until now was the out-of-band channel to pass it in
to the home.  One way of thinking about ISDN is that it makes
available to every residence the services that are already or almost
available to PBX's that utilize certain types of access to the
backbone (meaning, T1 trunks with signalling in one of the channels);
this does not necessarily mean that these PBX's can get caller's
number today (this service would need to be tarriffed etc.), but the
protocols are already in place that, in principle, would allow the
interaction to take place.
-- 
/jr
jr@bbn.com or jr@bbn.uucp