System and method to identify the terminating directory number at the customer premises

Abstract From the Canadian patent

25-, A telecommunication network having a switching system connected to a called station by a line that provides notification to a called party of information relating to an incoming call. This information generally consists of the called number, but may also include an extension or other code. The called party identification is delivered to the called telephone station set during the silent period after ringing, or, advantageously before ringing starts. A signal (e.g.FSK) is sent to the called telephone station set shortly before the ringing signal is sent to the called station. A converted at the customer premise receives the FSK signal and demodulates it. A control unit connected to the …