Caller ID Validation for Robocall Filtering False Positive Elimination

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing systems fail to accurately distinguish between legitimate calls and robocalls originating from unallocated or newly assigned telephone numbers, leading to false positives and ineffective robocall detection.

Innovation Solution

Implement a system and method that utilizes Secure Telephone Identity Revisited (STIR) and Signature-based Handling of Asserted information using SHAKEN (SHAKEN) to validate caller IDs, categorize numbers as fraud, spam, or neutral based on allocation and assignment status, and use network information and secure tokens to verify calls from newly assigned numbers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing systems block calls from unallocated or newly assigned telephone numbers, then robocall detection effectiveness is improved, but false positives increase and legitimate calls are blocked

Engineering Contradiction:

Improverobocall detection effectivenessVSAvoidcall categorization accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system performs preliminary validation of caller ID information using STIR/SHAKEN frameworks before categorizing calls. Digital signatures are verified in advance to establish the legitimacy of newly assigned numbers, preventing false positives while maintaining robocall detection effectiveness

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary validation layer that uses cryptographic digital signatures and network information as mediators between the caller and the receiving system. This intermediary mechanism verifies the authenticity of caller IDs without requiring direct trust in the calling number alone

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If caller ID validation is simplified to improve ease of operation, then system complexity is reduced, but measurement precision of call validation deteriorates

Engineering Contradiction:

Improvecaller ID validation simplicityVSAvoidvalidation accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system implements self-service validation where the calling network automatically provides cryptographic proof of legitimacy through digital signatures. The receiving system simply needs to verify these pre-packaged signatures, making the process easy to operate while maintaining high validation accuracy through cryptographic verification

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12542853B2System and method for mitigating robocalls with false positive elimination for valid subscribers

Publication Date: 2026.02.03 AT&T MOBILITY II LLC

AI summary

Aspects of the subject disclosure may include, for example, a device having: a processing system including a processor; and a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations of: determining whether a calling number of a call is unallocated; determining whether the calling number is unassigned to a subscriber; validating the calling number as an authentic telephone number; categorizing the calling number as fraud or spam responsive to the calling number being unallocated, allocated and unassigned, or allocated, assigned and invalid; and categorizing the calling number as neutral responsive to the calling number being allocated, assigned and validated. Other embodiments are disclosed.