Method and apparatus for facilitating law enforcement agency monitoring of cellular telephone calls
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United States of America Patent
Stats
-
Oct 26, 1999
Grant Date -
N/A
app pub date -
May 3, 1996
filing date -
May 3, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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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