Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!wuarchive!texbell!vector!telecom-gateway From: nvuxr!deej@bellcore.bellcore.com (David Lewis) Newsgroups: comp.dcom.telecom Subject: Re: Is CNI Necessarily ISDN? Message-ID: Date: 29 Aug 89 17:19:13 GMT Organization: Bellcore, Livingston, NJ Lines: 41 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 332, message 8 of 9 In article , euatdt@euas11g.ericsson. se (Torsten Dahlkvist) writes: > An interesting thought just struck me. There's been some talk about Calling > Number Information on this meeting and some about ISDN. Because I used to > work with ISDN and the first time I heard of CNI was there, I just naturally > assumed they were linked. That is, I thought the subscribers beeing offered > CNI were field-trial ISDN customers. But when I look at the numbers of > subscribers quoted as potential CNI customers it certainly doesn't look > like any field trial any more. Or somebody is manufacturing one HELL of > a lot of stuff which I haven't heard about. What most people are talking about is CLASS (SM), Custom Local Area Signaling Services. The CLASS package of services makes use of Signaling System 7 common channel signaling to transmit Calling Party Number from the originating end office to the terminating end office. The terminating end office extracts the CPN from the SS7 Initial Address Message (IAM) and does whatever actions are necessary, based on that calling party number and called party number, to provide the particular service. In the case of CPN Delivery, aka Caller*ID or whatever (Calling Number Identification, in ISDN terms), it sends the calling party number to the user in the gap between the first and second rings, using a special signaling protocol which I'm not that familiar with. (and can't find offhand.) > ...how much (information) do they send out? Is it just a > field of "display data" that is shown on the user's display or does the > receiving unit contain additional "intelligence" so that it can select > specific fields of information from the burst? It's just Calling Party Number -- there's no "user-to-user signaling", just "network to user" signaling. Of course, there's nothing to say you couldn't develop CPE to take the calling party number and do all sorts of things with it -- call screening, database lookup (sometimes called "account match"), etc., etc... -- David G Lewis ...!bellcore!nvuxr!deej "If this is paradise, I wish I had a lawnmower."