VoIP Caller ID Verification via SIP Signaling
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Solution Overview
Problem
Spoofing technology undermines the authenticity of Caller ID information in Voice over IP (VoIP) calls, making it difficult for recipients to trust the displayed caller identity, which is essential for call screening and blocking.
Innovation Solution
A method to authenticate Caller ID information by detecting the validity of the IP address associated with the calling party node, using network devices like originating and terminating routers, which insert a verification bit into SIP Invite messages to ensure the accuracy of displayed caller information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If spoofing technology is used to mask caller identity, then caller anonymity is improved, but Caller ID authenticity deteriorates
Solution Approach 1:
The patent applies preliminary action by performing IP address validation and inserting verification bits into SIP Invite messages before the call is completed. The originating router validates the caller's IP address against the provided Caller ID information in advance, and embeds the verification result in the SIP signaling pathway, ensuring authenticity is established before the called party receives the Caller ID display.
Solution Approach 2:
The patent introduces network devices (originating and terminating routers) as intermediaries between the calling party and the called party. These routers act as mediators that validate Caller ID information, insert verification bits into SIP messages, and transmit authentication status along the call pathway, thereby preserving Caller ID authenticity without preventing spoofing technology itself.
2Reliability
If Caller ID verification is implemented, then Caller ID authenticity is improved, but device complexity deteriorates
Solution Approach 1:
The patent applies self-service by enabling network devices to automatically validate Caller ID information and insert verification bits into SIP messages without requiring manual intervention. The originating router autonomously performs IP address validation, determines verification status, and embeds the verification bit in the SIP Invite message, while the terminating router automatically extracts and forwards the verification status to the called party's device.
3Measurement precision
If verification bits are inserted into SIP messages, then Caller ID validation is improved, but information loss deteriorates
Solution Approach 1:
The patent applies the nested doll principle by embedding a verification bit within the existing SIP Invite message structure. The verification bit is nested as a field within the SIP protocol message, allowing authentication information to be carried along with the call signaling without requiring separate communication channels or external validation systems.
Data Source
AI summary
Caller ID information provided coincident to a Voice over IP (VoIP) call is validated by one or more network devices. An originating router detects an offered IP address associated with a calling party node, for example, upon receiving a SIP Invite message initiated by the calling party node. The originating router determines the validity of the offered IP address and hence determines the validity of the Caller ID information based on the validity of the offered IP address. The originating router sends indicia of the validity to a terminating router, connected to a called party node, by inserting a verification bit in the SIP Invite message and sending the transformed SIP Invite message to the terminating router. Alternatively, the terminating router may query the originating router for indicia of validity. Upon receiving the indicia of validity, the terminating router may notify the called party node and so inform the called party whether it can rely on the Caller ID information.