In addition to being used when routing 9-1-1 calls, NG9-1-1 systems use GIS data before a 9-1-1 call is placed. As Communications Service Providers (CSPs) prepare subscriber records for 9-1-1, they must confirm subscriber records have addresses usable for 9-1-1. This process is similar to checking an E9-1-1 ALI record for MSAG validation. In this case, a Location Information Server (LIS) queries an LVF with the location in question. The LVF examines its GIS database to see if the address is valid for 9-1-1. The GIS data provisioned to the LVF is identical to the GIS database provisioned to the ECRF.
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