NG112 reference

Failover Alternate Routing

Structured NG112 reference page.

112 readiness

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

Resilience

Failover and Alternate Routing

Emergency networks need degraded-mode behavior that has been designed and rehearsed. Alternate routing can protect callers during PSAP outages, ESInet impairments, carrier interconnect failures, routing database problems or regional disasters.

Primary route unavailable

Policy check

Alternate PSAP or route

Operational notification

What it does

Failover and alternate routing define where emergency sessions go when the normal path, function or PSAP cannot take the call.

It preserves emergency reachability when the preferred route is unavailable or unsafe.

How it works

Monitors availability of key routing and PSAP elements.
Uses predefined alternate destinations and escalation rules.
Logs degraded routing decisions for later review.

Key interfaces and protocols

Routing policy
Monitoring/alarms
SIP rerouting
Operational runbooks

Systems it interacts with

ESRP
ESInet
PSAP
BCF
Monitoring

Common failure modes

Failover works technically but overloads alternate PSAP.
Callbacks or transfers fail after alternate routing.
Location data is lost in fallback path.
Operators do not know degraded mode is active.

Implementation considerations

Run live-fire exercises with stakeholders.
Verify media, RTT and data survive alternate paths.
Publish clear operational ownership for declaring and clearing degraded mode.

Standards

ETSI TS 103 480
ETSI Plugtests material

Related NG112 technologies

Resilience Policy Routing ESRP PSAP Interconnect Testing and Interoperability

Related country deployments

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

NG112 Checklists

Sources

ETSI TS 103 480 deliverable directory - ETSI, accessed 2026-08-31
5th NG112 Plugtests Report - ETSI, accessed 2026-08-31
6th NG112 and NG eCall Plugtests Report - ETSI, accessed 2026-08-31
ETSI TS 103 479 deliverable directory - ETSI, accessed 2026-08-31

Last verified: 2026-08-31