FAS Detection via Audio Comparison
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Solution Overview
Problem
Current methods for detecting False Answer Supervision (FAS) in telecommunications, relying solely on Call Data Records, are ineffective and often lead to false positives, failing to accurately identify fraudulent activities by carriers.
Innovation Solution
A method involving placing calls from a data network to a target phone number using both a trusted and suspect carrier, recording the calls, and comparing the audio data files to determine similarity, with a reliability threshold to flag potentially malicious carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CDR (Call Data Records) alone is used for detecting FAS, then the detection method is simple, but the detection accuracy is low and false positives occur
Solution Approach 1:
The patent combines multiple detection methods: CDR analysis is merged with audio data recording and comparison. The system records audio from test calls through the suspect carrier and compares it with reference audio from trusted carriers, creating a multi-dimensional detection approach that overcomes the limitations of CDR-only methods
Solution Approach 2:
The patent introduces audio data as an intermediary element between the carrier being tested and the detection system. By recording and analyzing audio characteristics (ring back tones, IVR responses, voice mail messages), the system creates a reliable intermediary indicator of carrier behavior that is difficult to fake
2Measurement precision
If audio data comparison method is used, then the FAS detection accuracy is improved, but the device complexity and operational complexity increase
Solution Approach 1:
The patent performs preliminary actions by pre-recording reference audio data files from trusted carriers before conducting actual FAS detection. These reference files (containing ring back tones, IVR responses, etc.) are stored and ready for comparison, eliminating the need to create them during the detection process itself
Solution Approach 2:
The patent creates copies of audio data for analysis purposes. Test calls are made through the suspect carrier and audio is recorded as a copy, then this copy is compared with reference copies from trusted carriers. This copying approach allows non-intrusive analysis without affecting actual call operations
Data Source
AI summary
A system and method that may include placing a first telephone call from a data network to a target phone number using a trusted carrier; recording the first telephone call in a reference audio data file; placing a second telephone call from the data network to the target phone number using a suspect carrier; recording the second telephone call in a test audio data file; and comparing the test audio data file to the reference audio data file.