ECRF (Emergency Call Routing Function)

ECRF (Emergency Call Routing Function) is a functional element in NGCS (Next Generation Core Services) which is a LoST protocol server where location information (either civic address or geo-coordinates) and a Service URN serve as input to a mapping function that returns a URI used to route an emergency call toward the appropriate PSAP for the caller’s location or towards a responder agency.

External ECRF

An ECRF instance that resides outside of an NGCS instance.

Internal ECRF

An ECRF instance that resides within and is only accessible from an NGCS instance.


 * NENA-STA-019, NENA NG9-1-1 Call Processing Metrics Standard
 * NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1
 * NENA-STA-005, NENA Standards for the Provisioning and Maintenance of GIS data to ECRFs and LVFs