112NG112.netNext generation emergency communications

NG112 reference

Sip Geolocation

Structured NG112 reference page.

112 readiness

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

SIP and Emergency Signaling

SIP Geolocation

SIP Geolocation is not the location object itself. It tells SIP-aware systems where location is in the message or where it can be retrieved. That distinction matters because emergency routers and PSAP systems may support location-by-value, location-by-reference, or only a subset of expected behavior.

PIDF-LO is the location object; SIP Geolocation is how SIP conveys or references that location.
PIDF-LO or reference
->
SIP Geolocation
->
Routing function
->
PSAP display

What it does

SIP Geolocation is the signaling mechanism used to carry or reference location information in a SIP session.

It lets routing functions and PSAPs find the caller location associated with the emergency session.

How it works

  • Includes location information or a reference in SIP signaling.
  • Allows downstream functions to route or display location.
  • Can interact with privacy and retention rules.

Key interfaces and protocols

  • IETF RFC 6442
  • PIDF-LO
  • SIP INVITE
  • Location-by-value/reference

Systems it interacts with

  • SIP clients
  • BCF
  • ESRP
  • ECRF
  • PSAP

Common failure modes

  • Location body omitted from message.
  • Reference is unreachable from emergency network.
  • Privacy handling blocks operational use.
  • SBC normalization removes required headers.

Implementation considerations

  • Test through every SIP hop.
  • Do not assume location by reference is supported end to end.
  • Keep privacy policy aligned with emergency service needs.

Standards

  • IETF RFC 6442
  • IETF RFC 4119

Related NG112 technologies

Relationship graph

Location chain: Emergency Location Chain <-> LIS <-> HELD <-> PIDF-LO <-> SIP Geolocation <-> Location-Based Routing

PIDF-LOSIP Emergency SignalingHELDESRPEmergency Location Chain

Related country deployments

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

Related articles

PIDF-LO

Sources

Last verified: 2026-08-31

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