Method for the automatic insertion or removal of a calling number identification (cnid) blocking prefix from within a telephone number in a personal computer based telephone management system

Abstract From the Canadian patent

With Calling Number Identification (CNID) service Frequency Shift Keying (FSK) data is sent over the telephone lines to the telephone service customer. A telephone subscriber may prevent their name/number from being transmitted to the party they are calling on a per call basis by dialing a prefix before they dial the desired number. The present invention allows for the automatic insertion/removal of that prefix in the number stream when the called party's number is dialed. This feature is accomplished by inserting a $ character into the dialing sequence. If the blocking feature is enabled the $, is translated to the numeric sequence necessary to prevent the transmittal of one's telephone …