An NG9-1-1 system encompasses two primary elements: the ESInet and Next-Generation Core Services (NGCS). The ESInet delivers i3-compliant emergency calls to the appropriate PSAP and supports NGCS; it also potentially is the transport mechanism for other public service-related capabilities. However, the ESInet is not equivalent to the NG9-1-1 software and database functions that operate on the ESInet. Rather, the NGCS consists of the software elements and related databases that are needed to process a 9-1-1 call on the NG9-1-1 network. The distinction between the ESInet and NGCS is important.