NG112 reference
Volte
Structured NG112 reference page.
112 readiness
Policy, location, routing, and response quality connected in one operational model.
Mobile and IMS
VoLTE Emergency Calling
Voice over LTE
As circuit-switched voice retires, VoLTE emergency behavior becomes a public-safety dependency. Emergency support, device compatibility, roaming and fallback cannot be assumed uniformly across Europe.
What it does
VoLTE emergency calling uses LTE access and IMS session control to place emergency calls over 4G networks.
VoLTE can be a primary mobile access path feeding emergency sessions toward national 112 systems.
How it works
- The handset places an emergency call over LTE using IMS procedures.
- Network and device support determine emergency capability.
- Location may be delivered through mobile network, handset, AML or next-generation paths.
Key interfaces and protocols
- 3GPP IMS emergency procedures
- SIP/SDP
- Mobile location
- Emergency interconnect
Systems it interacts with
- IMS emergency calling
- Mobile location
- Emergency roaming
- AML
- PSAP
Common failure modes
- Device falls back unexpectedly or cannot fall back.
- Visited network does not support expected roaming behavior.
- Emergency location path differs from voice path.
- Coverage holes force access change.
Implementation considerations
- Track 2G/3G sunset assumptions.
- Test with real device classes and roaming scenarios.
- Keep AML and NG112 claims separate.
Standards
- 3GPP TS 23.167
- 3GPP TS 24.229
Related NG112 technologies
Relationship graph
Mobile chain: IMS Emergency Calling <-> VoLTE Emergency Calling <-> VoNR Emergency Calling <-> Emergency Roaming <-> NG eCall
Related country deployments
No country deployments are listed here until independently verified against official or high-confidence sources.
Related articles
Sources
- 3GPP TS 23.167: IMS emergency sessions - 3GPP, accessed 2026-08-31
- 3GPP TS 24.229: IMS call control protocol based on SIP and SDP - 3GPP, accessed 2026-08-31
- 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
- Next Generation 112 and the new Emergency Services Networks Landscape - EENA, accessed 2026-08-31
Last verified: 2026-08-31