Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!orchid!clyde!rutgers!mit-eddie!genrad!decvax!ucbvax!ANDREW.CMU.EDU!ms6b# From: ms6b#@ANDREW.CMU.EDU.UUCP Newsgroups: comp.dcom.telecom Subject: Calling number delivery Message-ID: Date: Mon, 13-Apr-87 16:06:27 EST Article-I.D.: andrew.wUUJBIy00Ugczj00-I Posted: Mon Apr 13 16:06:27 1987 Date-Received: Sat, 18-Apr-87 00:48:56 EST Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 53 Approved: telecom@xx.lcs.mit.edu For those who want more information about how CLASS systems deliver the caller's number to a handset in a non-ISDN environment, consult the following: BellCore Technical Advisory TA-TSY-000031, November 1984 "Calling Number Delivery" and TA-TSY-000030, November 1984 "SPCS/Customer Premises Equipment Data Interface" Available from: Manager-Information Release Bell Communications Research, Inc. 435 South Street Room 2J-272 Morristown, NJ 07960-1961 (201) 829-4149 Some quotes: "The Calling Number Delivery service allows the called customer premises equipment (CPE) to receive the Directory Number (DN) of the calling party during the ringing cycle....Then, depending on the options offered by the CPE, the DN is displayed, and or printed out. "...Calling Number Delivery service allows customers with Call Waiting Service to possibly receive the calling DN two times in the call sequence--during the ringing cycle, as above, and also during the talking state of the call. For the latter case, the DN transmitted is the DN of the party calling the customer while the customer is busy on another call. "Finally Calling Number Delivery service allows the called CPE to receive a four digit or longer Personal Identification Number (PIN) instead of the calling DN. The PIN would be dialed by the calling party as part of the calling sequence. Receiving a PIN would indicate to the called party that the call is from someone that the called party probably wants to talk to, even though the call might be from a line having a DN that would not have been recognized if displayed to the called party (e.g. a coin line)." "For calling parties concerned about the privacy of their DN's the capability is provided to allow callers to prevent transmission of their DN's to the called party's CPE, either for all calls or on a per call basis." The details of the data communication physical layer is not spelled out in TA-TSY-000030--in this report BellCore seems to be soliciting ideas from switch vendors. The link layer protocol specified consists of checksummed packets of asynch characters with a simple ACK/NAK stop and wait ARQ. Information can be coded as ASCII or BCD (specified in packet header).