NG112 reference
Pidf Lo
Structured NG112 reference page.
112 readiness
Policy, location, routing, and response quality connected in one operational model.
Location
PIDF-LO
Presence Information Data Format - Location Object
PIDF-LO is a format, not a database and not a location-discovery protocol. It can describe civic fields, geodetic coordinates, uncertainty and usage rules. In emergency calling it is often paired with SIP location conveyance or delivered after a HELD query.
What it does
PIDF-LO is an XML-based location object used to represent civic or geodetic location information for emergency communications.
PIDF-LO gives emergency systems a structured location object that can be routed, displayed, logged and interpreted.
How it works
- Encodes civic or geodetic location into a standardized XML object.
- May include usage rules and location-method context.
- Can be carried by value or referenced through signaling depending on architecture.
Key interfaces and protocols
- IETF RFC 4119
- SIP Geolocation
- HELD
- Civic/geodetic schemas
Systems it interacts with
- LIS
- HELD client
- SIP proxy
- ESRP
- PSAP display
Common failure modes
- Civic fields are syntactically valid but operationally vague.
- Object is stripped by an intermediate SIP device.
- Coordinates lack usable uncertainty.
- Privacy rules or retention behavior are misunderstood.
Implementation considerations
- Validate what downstream systems actually parse.
- Use sanitized examples in training, not real caller data.
- Avoid assuming PIDF-LO alone proves the route is correct.
Standards
- IETF RFC 4119
- IETF RFC 6442
Related NG112 technologies
Relationship graph
Location chain: Emergency Location Chain <-> LIS <-> HELD <-> PIDF-LO <-> SIP Geolocation <-> Location-Based Routing
Related country deployments
No country deployments are listed here until independently verified against official or high-confidence sources.
Related articles
Sources
- RFC 4119: A Presence-based GEOPRIV Location Object Format - IETF, accessed 2026-08-31
- RFC 6442: Location Conveyance for SIP - IETF, accessed 2026-08-31
- RFC 5985: HTTP-Enabled Location Delivery - IETF, accessed 2026-08-31
- ETSI TS 103 479 deliverable directory - ETSI, accessed 2026-08-31
Last verified: 2026-08-31