The NENA i3 specification for NG9-1-1 will replace the current functions of selective routing, ALI and MSAG with IP-based software functions and databases. It will use a specific design for an emergency services IP network (ESInet) and employ new functional elements for dynamic call routing and location validation. GIS databases and geospatial policy-based call routing are key elements in the NENA i3 architecture. As originating networks evolve, it will be possible for the caller’s location to be determined before the call is delivered to a PSAP.

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