Outbound Call False Signal Detection via Dual-Verification
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Solution Overview
Problem
Existing automated call distribution systems face challenges in distinguishing between false and authentic 'not in service' tones, particularly due to devices like the Telezapper®, which can mislead systems into thinking a number is disconnected when it's actually legitimate, affecting legitimate business calls.
Innovation Solution
A method and system that monitor telephone lines for both service tones and call connected signals to differentiate between authentic and false tones, allowing for proper routing of calls to agents or handling as connected calls when both signals are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system monitors only for service tones to detect disconnected numbers, then disconnected numbers can be identified, but false tones from devices like Telezapper® cannot be distinguished from authentic tones
Solution Approach 1:
The system uses feedback by monitoring for the presence or absence of call connected signals (such as loop current drops, in-band signals, channel associated signals, or control channel signals) to verify whether service tones are authentic. When a service tone is detected, the system checks for corresponding call connected signals; if both are present, the service tone is classified as false. This feedback mechanism resolves the contradiction by adding verification that eliminates false positives while maintaining detection accuracy.
Solution Approach 2:
The system introduces an intermediary verification step by using call connected signals as a mediator to determine the authenticity of service tones. Instead of relying solely on service tone detection, the system uses call connected signals as an intermediate indicator to confirm whether the service tone is genuine or false, thereby resolving the contradiction between detection accuracy and false positive rate.
2Productivity
If the system routes calls based solely on service tone detection, then disconnected calls can be filtered, but legitimate calls blocked by false tones are lost
Solution Approach 1:
The system applies feedback by using call connected signals to verify the authenticity of service tones before routing decisions are made. This feedback loop ensures that calls are not incorrectly routed as disconnected when false tones are present, maintaining both call filtering efficiency and call routing accuracy.
Solution Approach 2:
The system uses call connected signals as an intermediary to mediate between service tone detection and call routing decisions. This intermediary verification ensures that routing accuracy is maintained while preserving call filtering efficiency, as legitimate calls blocked by false tones are correctly identified and routed.
3Reliability
If the system uses multiple signal monitoring methods to verify call status, then false tones can be distinguished, but system complexity increases
Solution Approach 1:
The system applies universality by using a single monitoring framework that can detect multiple types of call connected signals (loop current drops, in-band signals, channel associated signals, and control channel signals). This multi-functional approach allows the system to authenticate service tones through various signal types without requiring separate monitoring systems, thereby reducing overall complexity while maintaining high reliability.
Data Source
AI summary
Systems and methods for detecting false signals on a telephone line. The devices provide an additional verification for outbound calls which result in a disconnected or not in service signal that such signals are valid and not false tones being emitted by a device or service employed by the call recipient, The type of additional verification of the outbound call is dependent on the telephone network on which the outbound call is placed. For example, on an analog telephone network a drop in loop current may be detected indicting a connected call which is contrary to the disconnected or not in service signals being received. Such connected signals can be detected on digital networks by monitoring dedicated control data channels or through the use of data received through the use of in-band signaling. Once the additional verification had detected false tones the call can be process as if a connection occurred including routing such calls to an available agent or other handling process customized to handle such calls.