NG112 reference

Ecrf

Structured NG112 reference page.

112 readiness

Policy, location, routing, and response quality connected in one operational model.

Core NG112 Architecture

ECRF

Emergency Call Routing Function

An ECRF is about location-based service routing, not simply telephone-number lookup. It depends on authoritative service boundaries, geospatial data quality and policy about ambiguous or missing location. In some architectures the protocol expression resembles LoST; in others, the same conceptual function may be implemented behind national interfaces.

LIS is not ECRF: a LIS provides location; an ECRF uses location to support routing.

Location + service

ECRF lookup

Routing URI or decision

ESRP

PSAP

What it does

An ECRF maps a caller location and requested emergency service to routing information for the appropriate emergency destination.

The ECRF helps the routing layer determine which PSAP or emergency service URI should receive a session.

How it works

Receives location and service context from a routing element.
Matches the location to emergency service boundaries.
Returns routing information or a route decision used by the ESRP.

Key interfaces and protocols

LoST concepts
GIS/service boundary data
SIP routing policy
Administrative provisioning

Systems it interacts with

ESRP
GIS
LVF
PSAP boundary data
National routing databases

Common failure modes

Out-of-date service boundaries
Postal address accepted but not routable
Border-area ambiguity
Conflicting civic and geodetic location

Implementation considerations

Treat GIS data as operational infrastructure.
Version service boundaries and test edge cases.
Document how emergency service subtypes are routed.

Standards

IETF RFC 5222
IETF RFC 5031
ETSI TS 103 479

Related NG112 technologies

Relationship graph

Routing chain: ESRP <-> ECRF <-> LoST <-> PSAP Technology <-> ESInet

LoST ESRP GIS for Emergency Routing Location-Based Routing LVF

Related country deployments

No country deployments are listed here until independently verified against official or high-confidence sources.

NG112 Architecture

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
RFC 5222: LoST: A Location-to-Service Translation Protocol - IETF, accessed 2026-08-31
RFC 5031: A Uniform Resource Name for Emergency and Other Well-Known Services - IETF, accessed 2026-08-31

Last verified: 2026-08-31