System and method for detecting three-way call circumvention attempts
First Claim
Patent Images
1. A method for detecting an attempted three-way call that takes place during a telephone call, the method comprising the steps of:
- monitoring an audio stream of the telephone call;
detecting a hook-flash signal in the audio stream; and
determining, in response to detecting the hook-flash signal, whether a call progress tone is present in the audio stream that is indicative of the attempted three-way call, the determining including;
calculating an elapsed time during which a power level of the audio stream exceeds a pre-determined threshold during a time period following the detection of the hook-flash signal; and
determining whether said elapsed time exceeds a maximum allowable period of time.
7 Assignments
1 Petition
Accused Products
Abstract
Disclosed is a three-way call detection system and method for use with a telephone management system. Specifically, a three-way call detection system and method for detecting continuous noise indicative of an attempt to mask a three-way call attempt. The continuous noise detection system and method may be stand alone or used in conjunction with any existing three-way call detection system and method.
176 Citations
20 Claims
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1. A method for detecting an attempted three-way call that takes place during a telephone call, the method comprising the steps of:
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monitoring an audio stream of the telephone call; detecting a hook-flash signal in the audio stream; and determining, in response to detecting the hook-flash signal, whether a call progress tone is present in the audio stream that is indicative of the attempted three-way call, the determining including; calculating an elapsed time during which a power level of the audio stream exceeds a pre-determined threshold during a time period following the detection of the hook-flash signal; and determining whether said elapsed time exceeds a maximum allowable period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method fir detecting an attempted three-way call that takes place during a telephone call, the method comprising the steps of:
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monitoring an audio stream of the telephone call; detecting a hook-flash signal in the audio stream; and determining, in response to detecting the hook-flash signal, whether a call progress tone is present in the audio stream that is indicative of the attempted three-way call, the determining including; calculating a noise pattern of a portion of the audio stream that occurred during a period of time following the detection of the hook-flash signal; and determining whether the noise pattern is indicative of the call progress tone. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for detecting an attempted three-way call that takes place during a telephone call, the apparatus comprising:
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an interface for receiving an audio stream of the telephone call from a telephone line; and a microprocessor coupled to the interface configured to; detect a hook-flash signal in the audio stream; and determining, in response to detecting the hook-flash signal, whether a call progress tone signal is present in the audio stream that is indicative of the attempted three-way call, the determining including; monitoring the audio stream for a predetermined time period following the detected hook-flash signal; calculating an elapsed time that a power level of the audio stream exceeds a predetermined threshold during the predetermined time period; and determining whether the elapsed time exceeds a maximum allowable period of time. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification