Lawful Interception of Voice Over IP (VoIP)

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Addressing Modern OTT VoIP Interception Challenges

The rapid adoption of Over-the-Top (OTT) Voice over IP (VoIP) services has transformed voice communications, enabling seamless connectivity across IP networks. However, this evolution has also introduced new lawful interception challenges, including encrypted traffic, limited interception points, and increasingly complex network environments. This whitepaper examines these challenges and explores the technologies, architectures, and operational approaches required to enable secure, compliant, and efficient lawful interception of modern VoIP communications.

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Passive Interception Workflow for VoIP Networks

Effective lawful interception of OTT VoIP traffic requires a non-intrusive approach that preserves network performance while ensuring accurate collection of authorized communications. PertSol's passive interception architecture captures mirrored traffic from strategic network elements such as Session Border Controllers (SBCs) and Edge Routers, eliminating the need to interfere with live network operations.

Intelligent probes inspect Layer 2 through Layer 7 traffic using advanced Deep Packet Inspection (DPI) to identify authorized target communications and isolate Intercept Related Information (IRI) and Communication Content (CC). The filtered data is securely forwarded to backend mediation systems, where it is processed, indexed, and made available for authorized retrieval through centralized management interfaces. This architecture delivers reliable interception, simplified investigations, and scalable deployment across modern IP-based telecom networks while maintaining network integrity and operational continuity.

Protocols & Compliance

A successful lawful interception platform must support diverse communication technologies while complying with evolving regulatory standards. PertSol's solution supports major IP networking protocols, SIP-based VoIP communications, RTP and SRTP media streams, multiple transport protocols, and a broad range of industry-standard voice codecs. The platform also enables seamless CMS integration through electronic provisioning, ETSI-compliant IRI conversion, real-time communication content delivery, MNP support, and high-availability deployment options, helping operators meet operational, regulatory, and future scalability requirements.

Key Insights

Understand the evolving lawful interception challenges introduced by OTT VoIP communications.
Learn how passive interception enables secure collection of IRI and Communication Content (CC).
Explore DPI-driven traffic filtering for accurate target identification and monitoring.
Discover broad support for VoIP protocols, transport technologies, and voice codecs.
See how standards-based integration enables scalable, compliant, and future-ready lawful interception deployments.

Download The Whitepaper

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