Telecommunications – Radiotelephone system – Message storage or retrieval
Patent
1996-05-03
1999-10-26
Chin, Wellington
Telecommunications
Radiotelephone system
Message storage or retrieval
455414, 455415, H04Q 720
Patent
active
059743093
ABSTRACT:
Billing identification numbers supplied to law enforcement agencies for monitored cellular calls are used to retrieve toll tickets generated by the cellular network. By processing the toll tickets, an identification may be made by the agency of the A-party to and routing of the monitored cellular call. Calling line identification (CLI) information is supplied to the monitoring law enforcement agency for each monitored call. The CLI information identifies the directory number of the A-party to the monitored cellular call when the A-party comprises another cellular subscriber. In those situations where the A-party comprises a wireline subscriber in a public switched telephone network (PSTN), the CLI information delivered to the monitoring law enforcement agency comprises either the calling line identification (CLI) information obtained over an integrated services user part (ISUP) trunk connection (identifying the wireline A-party), or converted A-number identification (ANI) information obtained over a non-ISUP trunk connection (identifying routing and switching information useful in tracing the call).
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I. Brini, C. Eynard, A. Gamba; "International Roaming in Digital Cellular Networks"; Proceedings of the International Switching Symposium, Yokohama, Japan; Oct. 25-30, 1992; Institute of Electronics Information and Communications Engineers; pp. 132-136.
Yen S --L., et al.: Intelligent MTS Monitoring System; Proceedings of the Annual International Carnahan Conference on Security Technology, Albuquerque, Oct. 12-14, 1994, No. Conf. 28, Oct. 12, 1994; pp. 185-187, XP000492127.
Chin Wellington
Telefonaktiebolaget L M Ericsson (publ)
Woldetatios Yemane
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