NG112 reference
Multimedia Negotiation
Structured NG112 reference page.
112 readiness
Policy, location, routing, and response quality connected in one operational model.
Media
Multimedia Negotiation
Modern emergency sessions may want voice, real-time text, video and data, but the path must negotiate compatible capabilities. Negotiation failures should degrade gracefully rather than block emergency access.
Caller capabilities
->SDP/media negotiation
->Supported streams
->PSAP workflow
What it does
Multimedia negotiation determines which media streams an emergency session can actually use.
It decides which media can be established between the caller and PSAP.
How it works
- Endpoints advertise media capabilities.
- Network and PSAP elements agree on codecs and streams.
- Fallback keeps critical communication available if richer media is unsupported.
Key interfaces and protocols
- SIP/SDP
- RTP/SRTP
- RTT media
- Video codecs
Systems it interacts with
- SIP
- RTT
- Video
- Total Conversation
- PSAP
Common failure modes
- Codec mismatch
- Firewall/media anchoring failure
- One-way audio/video
- Richer media failure blocks voice
Implementation considerations
- Define minimum acceptable fallback.
- Test transfers and alternate routing with all media types.
- Monitor media path health, not only SIP response codes.
Standards
- SIP/SDP standards
- ETSI NG112 references
Related NG112 technologies
Related country deployments
No country deployments are listed here until independently verified against official or high-confidence sources.
Related articles
Sources
- 112: the European emergency number - European Commission, accessed 2026-08-31
- Directive (EU) 2018/1972 establishing the European Electronic Communications Code - European Union, accessed 2026-08-31
- Emergency communications - BEREC, accessed 2026-08-31
- Next Generation 112 and the new Emergency Services Networks Landscape - EENA, accessed 2026-08-31
- ETSI TS 103 479 deliverable directory - ETSI, accessed 2026-08-31
Last verified: 2026-08-31
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