B2BUA Interceptor for Cross-Network IP Call Monitoring
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Solution Overview
Problem
Traditional methods for intercepting and recording IP calls, such as VoIP, are ineffective when the calling and called parties are located within different IP networks, as proxy servers are not used once the call is established, making it difficult to intercept the communication.
Innovation Solution
Implementing a back-to-back user agent (B2BUA) interceptor that sets up two IP call sessions, one between the calling party and the interceptor, and another between the interceptor and the called party, allowing the interceptor to receive and forward all information exchanged during the call, enabling interception and recording across different IP networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional proxy server methods are used for call interception, then call recording is possible within the same network, but the method becomes ineffective when calling and called parties are located within different IP networks
Solution Approach 1:
The patent introduces a back-to-back user agent (B2BUA) as an intermediary component that acts as a mediator between calling and called parties in different IP networks. The B2BUA establishes separate call sessions with each party, enabling transparent interception and recording of calls across network boundaries where traditional proxy methods fail.
2Ease of operation
If proxy servers are used for call management, then call routing is simplified, but the proxy server is not used once the call is established, making interception difficult
Solution Approach 1:
The patent applies preliminary action by establishing the B2BUA interceptor before the call is set up. The interceptor proactively creates two separate call sessions (one with the calling party and one with the called party) before the actual voice conversation begins, ensuring that all call information flows through the interceptor for subsequent interception and recording.
3Adaptability or versatility
If a back-to-back user agent interceptor is implemented, then interception is enabled across different IP networks, but the system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the interception system into distinct functional components: a B2BUA interceptor that manages call sessions, separate SIP signaling paths for each party, and independent media streams. This modular segmentation allows the complex interception function to be implemented through manageable, well-defined components that work together to enable cross-network call monitoring.
Data Source
AI summary
A method of managing an IP call between a calling party and a called party, the method comprising receiving, at a gateway, a request to set up the call from the calling party; determining, from the request, a requirement to route the call through an interceptor; forwarding the request from the gateway to the interceptor; setting up an IP call between the interceptor and the called party; setting up an IP call between the interceptor and the calling party; and operating the interceptor as a back-to-back user agent (B2BUA) between the calling party and the called party.