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abcdefghijklmnopqrstuvwxyz999-1-1aAdministrative ESN (Emergency Service Number)ALI (Automatic Location Identification)ANI (Automatic Number Identification)API (Application Programming Interface)cCBN (Call Back Number)CRN (Contingency Routing Number)dDID (Direct Inward Dialing)DNS (Domain Name System)eE911 (Enhanced 9-1-1)ECRF (Emergency Call Routing Function)ELIN (Emergency Location Identification Number)Emergency Location Identification Number (ELIN)ESN (Emergency Service Number)fFCC (Federal Communications Commission)FirstNet (First Responder Network) Authority)iILEC (Incumbent Local Exchange Carrier)IP Telephony (Internet Protocol Telephony)ISDN (Integrated Services Digital Network)ISP (Internet Service Provider)lLAN (Local Area Network)LandlineLEC (Local Exchange Carrier)mMLTS (Multi-Line Telephone System)nNANP (North American Numbering Plan)NENA (National Emergency Number Association)NG911 (Next Generation 9-1-1)pPOTS (Plain Old Telephone Service)PRI (Primary Rate ISDN)PSTN (Public Switched Telephone Network)sSBC (Session Border Controller)SIP (Session Initiation Protocol)SNMP (Simple Network Management Protocol)vVPN (Virtual Private Network)
