Multimedia Payload Separation for Lawful Interception
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Solution Overview
Problem
The double conversion of payload data streams in packet networks for tapping multimedia connections, particularly video telephony, results in end-to-end quality issues and restricts lawful interception capabilities, as video data cannot be effectively transferred through traditional TDM networks, leading to detectable quality deterioration and limited monitoring capabilities.
Innovation Solution
Separating audio and video payload data streams into distinct connections or packet addresses, allowing audio data to be routed through TDM loops for tapping while video data remains in the packet network, using existing facilities and protocols like SIP, H.323, or H.248 to manage the separation and distribution without affecting bandwidth or quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If payload data is tapped via TDM conversion in packet networks, then lawful interception capability is achieved, but end-to-end quality deteriorates and video data cannot be effectively transferred
Solution Approach 1:
The patent segments the audio payload and video payload into separate data streams. Audio data is routed through TDM networks for tapping, while video data is transmitted separately through packet networks, avoiding the quality deterioration that would occur if video were converted to TDM format.
Solution Approach 2:
The patent introduces an intermediary mechanism (separate routing paths and protocol conversion points) that allows audio to be tapped via TDM while video bypasses the TDM conversion process, thereby protecting video quality while still enabling lawful interception of audio.
2Reliability
If video data is routed through TDM network for tapping, then lawful interception of video is achieved, but bandwidth limitations and quality loss occur
Solution Approach 1:
The patent divides the multimedia stream into audio and video segments, routing audio through TDM networks for interception while transmitting video through packet networks with sufficient bandwidth, thus achieving video interception capability without suffering from TDM bandwidth limitations.
Solution Approach 2:
The patent creates a multi-functional system where audio data can be intercepted via traditional TDM methods while video data is handled through modern packet network methods, allowing the system to serve both legacy interception requirements and modern bandwidth-intensive video applications.
3Reliability
If double conversion (IP to TDM and back to IP) is performed for tapping, then payload data can be monitored, but quality deterioration becomes detectable
Solution Approach 1:
The patent segments the monitoring process so that only audio data undergoes the double conversion (IP to TDM and back), while video data maintains its packet network path without conversion. This selective segmentation prevents detectable quality deterioration in the video portion while still enabling monitoring of audio.
Data Source
AI summary
In one aspect of the invention, audio and video user data are separated. The audio user data is conducted via a TDM loop, where it is tapped and the video user data is fed to the recipient via the packet network, the separated audio and video user data are then combined again.