Pseudo-Call Routing for Out-of-Band Caller ID Authentication
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Solution Overview
Problem
Existing caller ID spoofing techniques deceive individuals by manipulating call origins, and STIR/SHAKEN authentication may fail in international or non-compliant networks, complicating call verification.
Innovation Solution
Implementing a pseudo-call process using out-of-band signaling to authenticate calls by initiating a pseudo-call to gather routing information, then using a content delivery network to provide branded call content during the actual call, ensuring legitimate calls are recognized by terminating networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If STIR/SHAKEN framework is implemented for call authentication, then caller ID spoofing prevention is improved, but compatibility with international networks and service providers that have not adopted the framework deteriorates
Solution Approach 1:
The patent introduces an intermediary authentication mechanism that operates between the calling network and terminating network. When STIR/SHAKEN signatures cannot be transmitted through intermediate networks, this intermediary system performs alternative authentication by exchanging call metadata (calling number, called number, time period) between networks and verifying call authenticity without relying on STIR/SHAKEN framework compatibility, thus resolving the contradiction between authentication reliability and international network compatibility
2Measurement precision
If STIR/SHAKEN signature transmission is used for call authentication, then call verification accuracy is improved, but transmission reliability through intermediate networks deteriorates
Solution Approach 1:
Instead of transmitting the actual STIR/SHAKEN cryptographic signature through potentially unreliable intermediate networks, the patent creates a copy of the essential authentication information (call metadata including calling number, called number, and time period) and transmits this copied information through alternative out-of-band channels. This allows verification accuracy to be maintained while avoiding the transmission reliability issues associated with signature propagation through complex call routing networks
3Reliability
If out-of-band authentication messaging is implemented, then authentication reliability for non-STIR/SHAKEN networks is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal authentication messaging system that can operate in multiple modes: it functions as a complement to STIR/SHAKEN when the framework is available, and as an alternative authentication mechanism when STIR/SHAKEN is not supported. This multi-functional approach allows the same out-of-band messaging infrastructure to serve both enhanced authentication reliability for non-STIR/SHAKEN networks and maintain compatibility with existing STIR/SHAKEN implementations, thereby managing system complexity while improving authentication reliability
Data Source
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AI summary
An example provides performing a pseudo-call operation to obtain call information and sharing the call information prior to placing the actual call, the example may include receiving a first call invite message from an out of band network, transmitting a call alert message to a terminating network indicating a time period, a calling number and a called number used for future calls verification to prevent call spoofing. Receiving a second call at the terminating network from another network, determining whether the indicated calling number and the called number match the received calling number and the called number and the second call was received within the time period and authenticate the incoming second call in case of positive match.