CALLING LINE TRACING SYSTEM AND IDENTIFICATION DETECTOR

摘要

CALLING LINE TRACING SYSTEM AND IDENTIFICATION DETECTOR A calling line tracing system and identification detector arranged for identifying the identity number of a calling station connected through a series of switching exchanges to a called station in any type of telephone network. The identification system is started automatically whenever a telephone exchange receives a call addressed to a local line designated with a special category or shunt. The local exchange, once the special category or shunt of the addressed line is sensed, automatically starts a change in the signalling sequence and disengages its control unit from the calling process, passing the control of the telephone call to the identification detector which is coupled to the addressed line. The identification detector starts a signalling process with the telephone exchange where the call has been originated to obtain all available information at that exchange about the calling telephone station. Once all available information has been received and entered in the memory of the detector, the calling process is completed regularly. The calling station identify information is shown on a display panel or stored in the detector memory for later retrieval.