AES67
AES67 is the AES-governed professional audio-over-IP interoperability standard for exchanging uncompressed PCM audio between otherwise separate network-audio ecosystems. It gives the media/timing contract: RTP audio over UDP/IP, PTPv2 timing, and SDP stream description. It does not give a universal controller, device-management model, security model, discovery UX, or day-two support boundary. When a system says it is "AES67 compatible", the useful follow-up is transmit/receive role, sample rate, packet time, channel count, multicast/unicast behavior, SDP workflow, PTP domain/profile, and what native ecosystem features change when AES67 mode is enabled.
Scope: AES67 — select the deployed product/version; optional services require separate selection.
protocol · Catalog reviewed 2026-09-27
AES67-2023
Related requirements
Review these entries for the services used in your design.
Infrastructure Requirements
- Managed switch with QoS / DSCP policy
- explicit PTPv2 grandmaster / domain / profile strategy
- explicit discovery/subscription method
- IGMP snooping and querier policy for multicast streams
- SDP handover workflow
Network & Physical Requirements
| Port / allocation | Transport | Connection / signal flow | Feature and requirement | Evidence |
|---|---|---|---|---|
| Negotiated | UDP | Media sender → Media receiver | Profile requirement · Core RTP audio to the destination/group and UDP port defined for the stream. AES67 stream planning; Lawo VSC configuration example Inspect the configured stream and SDP. Lawo VSC illustrates a configurable 5004 default; that default is not a universal AES67 allowlist. | Source checked 2026-09-27 Sender Multicast IP Addresses & UDP Port Number |
Physical, link and configuration requirements
configuration · Profile requirement · Core
Align the PTP profile and supported parameter ranges across endpoints.
AES67 / SMPTE timing interoperability
AES67 Media Profile and SMPTE ST 2059-2 are distinct profiles. Verify a compatible domain and message-rate configuration; schedule PTP traffic separately.
Gotchas & IT Notes
- ⚠Check exact media profile, format, packet time and firmware interoperability. Select discovery/orchestration services only where implemented.
- ⚠IGMP snooping and a querier are typical switched multicast design measures; clocking and routing must follow the selected profile.