mcb@ihnp4.UUCP (Mark C Baker @ AT&T Network Systems) (10/20/87)
The service being provided by NJ Bell this year which displays the phone number of the person calling you is not ISDN. It is part of a number of CLASS (Customized Local Area Signaling Services) features being offered from 1A ESS switch central offices. This is a analog switch by the way. The calling DN is sent to the customers premise equipment between the power ringing cycles. Calling Party DN is conveyed from one central office to another via CCIS, CCS7 in the future.