DTMF Analysis Module Sampling Cycle for MoIP Interoperability
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Solution Overview
Problem
Existing DTMF signal processing methods within MoIP networks face interoperability challenges due to computational inefficiencies and scalability issues, limiting effective detection and transmission of dual-tone multi-frequency signals across diverse network equipment and protocols.
Innovation Solution
A session exchange device with a DTMF analysis module is configured to analyze media signals within a MoIP network, utilizing a sampling cycle and session-layer parameter values to determine and extract DTMF signals, and route them through a processing pipeline that includes DTMF management and conversion modules for efficient detection and protocol adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If known detection techniques are used to detect DTMF signals in real-time, then interoperability challenges can be resolved, but the computational cost is expensive and the system is unscalable
Solution Approach 1:
The patent segments the continuous media signal into discrete packets at the network layer, and further segments DTMF detection into periodic sampling intervals. This allows distributed processing across network elements rather than requiring centralized computational resources, improving both interoperability and scalability.
Solution Approach 2:
The patent performs preliminary DTMF signal embedding at the source endpoint before transmission, and preliminary packetization at network layer devices. This preliminary action reduces the computational burden during real-time detection at intermediate nodes, enabling scalable real-time processing across the network.
2Device complexity
If network equipment supports only a small subset of media-layer protocols, then device complexity is reduced, but interoperability challenges arise
Solution Approach 1:
The patent introduces session exchange devices and border elements as intermediaries that perform protocol conversion and DTMF signal translation between different media-layer protocols. These intermediaries enable interoperability between equipment supporting different protocol subsets without requiring each device to support all protocols, thus maintaining low device complexity while achieving high interoperability.
Solution Approach 2:
The patent creates universal DTMF detection mechanisms that operate across multiple media-layer protocols through standardized packetization and session-layer interfaces. The DTMF analysis functionality becomes protocol-agnostic, allowing the same detection logic to work across diverse protocol implementations.
3Measurement precision
If DTMF signals are detected continuously in real-time, then detection accuracy is improved, but processing overhead increases
Solution Approach 1:
The patent implements periodic sampling of media signals at defined intervals rather than continuous analysis. DTMF detection is performed at regular sampling points during packet transmission, maintaining sufficient detection accuracy while reducing processing overhead by allowing the system to skip analysis during non-sampling intervals.
Solution Approach 2:
The patent performs partial DTMF detection by analyzing only critical portions of the media signal stream at strategic points in the transmission flow. Rather than continuously analyzing every packet, the system performs detection at key session exchange points and border elements, achieving adequate detection accuracy with reduced processing requirements.
Data Source
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AI summary
In one embodiment, a method includes receiving a media signal associated with a session established based on a session request. The session request is defined at a session exchange device associated with a media over internet protocol (MoIP) network. The method also includes sending a portion of the media signal to a dualtone multi-frequency (DTMF) analysis module during a sampling time period after a non-sampling time period.