Electronic surveillance via correlation of call legs

Details Electronic surveillance via correlation of call legs Electronic surveillance via correlation of call legs

2006-06-27

2006-06-27

Taylor, Barry (Department: 2643)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Monitoring

C379S035000, C379S114140

Reexamination Certificate

active

07068759

ABSTRACT:
A variety of methods and systems can be used to achieve electronic surveillance when a call is directed to a destination as a result of service processing. For example, in a system involving a redirecting switch and a service platform switch, correlation between calling party identities for outgoing and incoming call legs can be done to identify a hairpin loop scenario. Upon detection of such a scenario, an appropriate electronic surveillance message can be sent to a monitoring device indicating the call's destination. Correlation information can be collected from available call setup signaling parameters. The methods and systems can be applied, for example, to systems involving directory assistance call completion, voice-activated dialing, voicemail callback, and prepaid services.

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