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Standard E-9-1-1 Interface TriTech Software 3.4 Use Case: Wireless E911 Phase II Processing The Federal Communications Commission, (FCC) have defined wireless Enhanced 911 (E911) rules that seek to improve the effectiveness and reliability of wireless 911 service by providing 911 dispatchers with additional information on wireless 911 calls. The FCC divide the wireless E911 program into two parts - Phase I and Phase 11. Phase I requires carriers to report the telephone number of a wireless 911 caller and the location of the antenna that received the call. Phase II requires wireless carriers to provide far more precise location information, within 50 to 100 meters in most cases. When a Phase II message is received and identified by the VisiCAD E911 Interface, the interface will interpret the mapped latitude and longitude provided in the data stream, and store the information in the VisiCAD database. The target VisiCAD workstation will process the information in a manner allowing reverse geo-coding to identify and display a corresponding street segment within tolerance. If not within reverse geo-coding tolerance to identify a street segment, the latitude and longitude will be directly displayed within the address field. Additional Phase II information, such as Confidence Factor and Uncertainty Factor, may be mapped, stored and displayed as incident comments. 3.4.1 Design Constraints The FCC has not regulated or defined any standard for the data format or ensured that all vendors will pass the Phase II data in the same format. The ANI/ALI interface program will handle the conversion of latitude/longitude supplied by all vendors in one of several common formats, to VisiCAD storage format. Inconsistent data formats within a vendor or between vendors may result in data that cannot be processed by the E911 Interface. 3.5 Use Case: Detecting E911 Wireless Phase 11 Rebid Through the E911 system, a Call -Taker may request a rebid of E911 information, or the wireless E911 provider may automatically provide updated E911 information after the initial E911 data stream is received and processed. The VisiCAD E911 Interface provides configuration options to assist in identifying and recording rebids as they are received. When an E911 message received with an identifier corresponding to a wireless E911 Phase II call, and the field matching and time differential criteria identified in the preconditions are met, the E911 Interface establishes the data stream as a rebid of a previous message. For an established incident in VisiCAD, the Address Update feature will identify the incident as having potential address update information and allow the user to select and accept or decline potential updates. When a Phase II update is accepted, VisiCAD performs a reverse lookup on the latitude and longitude position information to attempt to provide a street segment, and update and geo-validate the address field of the incident. Additionally, from the Call Taking Screen, the VisiCAD user may display ANI/ALI information, including all messages received and associated to the incident by the E911 Interface, and display Phase II messages with valid latitude and longitude information on the VisiCAD Explorer map. Rebid criteria are configured within the E911 Interface Advanced Configuration for the E911 Phase II message type. The rebid determination criteria consist of matching a predetermined set of fields, and a time limit (from previously associated E911 data). Optionally, a configurable comment identifying the rebid event may be enabled to insert into the corresponding comments of an established incident in VisiCAD. Interface Requirements Document 6 of 11