LIF (Location Interwork Function)

LIF (Location Interwork Function) is the functional component of a Legacy Network Gateway which is responsible for taking the appropriate information from the incoming signaling (i.e., calling number/ANI, ESRK, cell site/sector) and using it to acquire location information that can be used to route the emergency call and to provide location information to the PSAP. In a Legacy PSAP Gateway, this functional component takes the information from an ALI query and uses it to obtain location from a LIS. In an ingress LSRG, this functional component interacts with an ALI system as if it were a PSAP to acquire location that can be used to route the emergency call and to provide location information to the PSAP. In an egress LSRG, an ALI system will interact with this functional component as if it were an MPC/GMLC to obtain location information.

Relevant NENA Documents
Note: To find and download the document, copy the document number (like NENA-STA-010) from below and search the NENA Standards and Documents page.

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• NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1
• NENA-INF-003, NENA Demarcation Points in NG9-1-1 Information Document