Local Call Splitter for Mobile Network Recording
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Solution Overview
Problem
Existing solutions for recording voice calls involving mobile telecommunications devices face challenges such as user interaction requirements, bypassing recording services, timing mismatches in signalling paths, and unacceptable audio delays, especially when calls are made across long distances.
Innovation Solution
A method utilizing a local call splitter within the telecommunications network to split calls into recording and transmission paths, optimizing call quality by selecting a splitter based on geographic location, and employing intelligent network signalling like CAMEL to manage call routing and recording, ensuring minimal latency and direct audio paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two stage dialing service is used to record mobile calls, then call recording can be achieved, but it requires user interaction and can be easily bypassed
Solution Approach 1:
The patent introduces a network-based call recording service that acts as an intermediary between the mobile subscriber and the network. The service controller intercepts call setup requests and automatically routes calls through recording infrastructure without requiring user interaction. This mediator approach prevents bypassing while maintaining reliability, as the recording service is embedded in the network path itself rather than relying on user-initiated dialing sequences.
2Reliability
If calls are routed through a home office recorder for long distance calls, then recording can be achieved, but audio delays become unacceptable
Solution Approach 1:
The patent implements local recording capabilities at visited network locations rather than requiring all calls to route back to the home office. When a mobile subscriber roams in a visited network, the service controller identifies local recording resources in that network and routes the call locally for recording. This local quality approach maintains comprehensive recording coverage while minimizing audio delay by eliminating long-distance routing back to the home office.
Solution Approach 2:
The patent segments the recording service into distributed recording points across multiple networks rather than a single centralized home office recorder. The service controller can select appropriate recording locations based on the mobile subscriber's current network location, dividing the recording function into geographically distributed segments that reduce transmission delays while maintaining complete recording capability.
3Adaptability or versatility
If independent signalling processes are used for call set up and onward path, then call routing flexibility is achieved, but timing mismatches cause long setup times or failed calls
Solution Approach 1:
The patent merges the call setup signalling and onward path routing into a coordinated process managed by the service controller. Rather than using completely independent signalling processes, the service controller integrates the recording service insertion into the existing call setup flow, combining the flexibility of independent routing with synchronized timing. This merging approach maintains adaptability while preventing timing mismatches that cause setup delays or failures.
Data Source
AI summary
A method of recording media transmitted to or from a first party communicating through one of a plurality of mobile telecommunications networks with a second party is described. Either the first party or the second party initiates a call with the other party. One of a set of call splitters distributed through the plurality of telecommunications networks is then determined to be a local call splitter to one of the parties. A connection is then established between the first party and the local call splitter to split the call into a recording part and a call part. The call part is routed between the first party and the second party via the call splitter to provide transmission of media between the first party and the second party, and the recording part is provided by the local call splitter to a recording service associated with the first party. Suitable apparatus is also described, as are methods for recording the calls of a subscriber to a central recording station using a network trigger set or a SIM application set to divert the call to a recording node.