Overview
IEC 62379-5-2:2014 - Common control interface for networked digital audio and video products (Part 5-2: Transmission over networks – Signalling) defines signalling protocols and message structures used to set up, manage and tear down “calls” that carry encapsulated digital media across heterogeneous networks. The standard addresses control-plane elements needed for interoperable transmission of audio and video flows between networked devices, and specifies how digital media is encapsulated within those calls.
Key topics and technical requirements
- Message and header formats - standardized signalling message structure, header fields and byte order to ensure interoperable parsing.
- Identification and addressing - unit identification, flow identifiers and address formats for routing media between endpoints.
- Information elements (IEs) - fixed and variable IE formats, types and ordering (e.g., called address, flow descriptor, data format, start/end time).
- Signalling procedures - protocols to establish routes and flows (FindRoute, AddFlow), disconnect (ClearDown), and manage mid-call information and resource changes.
- Media and encapsulation formats - definitions for packet data and pulse-code modulated (PCM) audio transport, sequencing and subframe/frame formats to carry digital audio/video within calls.
- Quality and control parameters - route metrics, end-to-end delay, path MTU, privilege/charge/cause codes for management and billing.
- Quasi‑connectionless and asynchronous modes - support for different transport behaviours and out-of-band data.
- Cause codes and diagnostics - standardized cause codes (including ITU‑T codes) for error reporting and interoperability troubleshooting.
Practical applications
- Implementing vendor-neutral signalling stacks for AV-over-IP products to enable multi-vendor interoperability.
- Designing networked audio/video equipment (encoders, decoders, mixers, gateways) that need standardized control-plane messaging for call setup and media encapsulation.
- Building broadcast and live-production networks that require predictable call routing, flow control and end-to-end media transport semantics.
- Integrating system-level control and monitoring tools that consume signalling IEs to display route state, QoS metrics and call diagnostics.
Who should use this standard
- AV equipment manufacturers, firmware and software developers
- System integrators and network architects for broadcast, conferencing and public address
- Test and certification labs validating interoperability of networked digital media products
Related standards
- IEC 62379 series (other parts of the Common Control Interface) - for broader device control and management topics.
- ITU‑T cause codes referenced in the document for standardized error reporting.
IEC 62379-5-2 is essential for anyone implementing or integrating signalling and media encapsulation for reliable, interoperable networked audio and video transport.
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