Specifications include, but are not limited to: 1. The system must accept traditional E9-1-1 calls (wireline, wireless and fixed VoIP) delivered on legacy CAMA circuits at install, and Next Generation IP traffic across the State of Illinois ESINet Network, when available, using NENA i3 standard SIP signaling with no additional hardware or software required. If IP based signaling is provided by a standards based IP network, IP to Analog gateway adapters will not be accepted. Native i3 is required directly to the system. 2. If required in this Proposal, describe the protocol and specifications used for external IP network connectivity. 3. The system shall comply with all current NENA protocols and standards. 4. Vendors will describe their plan to migrate the proposed system to accept NG9-1-1 as the standards for such requests are developed and McHenry County ETSB transitions to full i3 capability. 5. The system shall provide the capability to connect, when available, to a single standard NENA i3 NGCS connection to the ESInet per PSAP to support NG9-1-1, i3 core functions and capabilities. 6. The system shall be Wireless Phase I and II compatible and must be compatible with ten- digit ANI delivery and non-call associated signaling (NCAS) wireless ALI solutions. 7. All vital system modules shall be protected to ensure there is no single point of failure. Please describe in detail how the proposed system incorporates redundancy to meet the requirement. 8. Under no circumstance shall a failure in any vital system module disable more than 50% of the Intelligent Workstations and/or IP phones at any site.