VoIP Media Relay for Lawful Intercept
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Solution Overview
Problem
Lawful intercept of VoIP communications in IP networks is challenging due to their connectionless nature and distributed technologies, making it difficult for service providers to reliably intercept and reassemble packets across multiple paths, resulting in economic and technological hurdles for compliance with legal intercept requirements.
Innovation Solution
A method and system that associate intercept information with dialing profiles, allowing for real-time interception by identifying a media relay through which VoIP communications pass, enabling the interception of VoIP communications at a point under the provider's control and copying them to a mediation device for law enforcement agencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If service providers deploy interception equipment at every point in the IP network to capture VoIP packets, then interception coverage is improved, but device complexity and economic cost increase significantly
Solution Approach 1:
The patent introduces a media relay as an intermediary component that all VoIP communications must pass through. This single intermediary point enables centralized interception of packets without requiring deployment at every network node, thereby maintaining interception coverage while significantly reducing system complexity and cost.
Solution Approach 2:
The media relay serves multiple functions: it acts as a communication intermediary for normal VoIP traffic and simultaneously functions as an interception point for law enforcement access. This multi-functionality eliminates the need for separate interception infrastructure, reducing overall device complexity while maintaining reliable interception capability.
2Reliability
If packets are intercepted at multiple distributed points in the IP network, then interception completeness is improved, but packet reassembly difficulty increases due to unpredictable paths and out-of-order arrivals
Solution Approach 1:
By designating the media relay as a mandatory intermediary for all VoIP communications, the patent ensures that all packets pass through a single controlled point. This eliminates the need for complex distributed packet collection and reassembly, as packets are naturally funneled through one location where they can be intercepted in order without complex reassembly logic.
Solution Approach 2:
The system performs preliminary routing of all VoIP packets through the media relay before they reach their final destination. This preliminary action through a controlled intermediary point ensures packets are captured in sequence and in complete form, avoiding the need for complex post-capture reassembly operations.
3Productivity
If the system monitors all VoIP communications in real-time to meet lawful intercept requirements, then law enforcement capability is improved, but processing time and system resource consumption increase
Solution Approach 1:
The patent extracts only the necessary interception function from the general VoIP communication flow by utilizing the media relay's existing packet forwarding capability. Law enforcement agencies receive copies of packets already being routed through the relay, eliminating the need for separate real-time monitoring and processing infrastructure, thereby reducing system resource consumption and processing time.
Data Source
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AI summary
Methods and apparatus for intercepting communications in an Internet Protocol (IP) network involve maintaining dialing profiles for respective subscribers to the IP network, each dialing profile including a username associated with the corresponding subscriber, and associating intercept information with the dialing profile of a subscriber whose communications are to be monitored. Intercept information will include determination information for determining whether to intercept a communication involving the subscriber, and destination information identifying a device to which intercepted communications involving the subscriber are to be sent. When the determination information meets intercept criteria communications are established with a media relay through which communications involving the subscriber will be conducted or are being conducted to cause the media relay to send a copy of the communications involving the subscriber to a mediation device specified by the destination information.