/mcpC H A P T E R 52 Emergency Call Handler • Emergency Call Handler Overview, on page 637 • Emergency Call Handler Prerequisites, on page 638 • Emergency Call Handler Task Flow, on page 638 • Interactions, on page 645 • Emergency Call Handler Troubleshooting, on page 647 Emergency Call Handler Overview Emergency Call Handler helps you to manage emergency calls in your telephony network while following local ordinances and regulations. When an emergency call is made the following is required: • The emergency call must be routed to the local Public-Safety Answering Point (PSAP) based on the location of the caller. • The caller's location information must be displayed at the emergency operator terminal. The location information can be obtained from an Automatic Location Information (ALI) database. The caller's location is determined by the Emergency Location Identification Number (ELIN). An ELIN is a Direct Inward Dial (DID) number that the PSAP can dial to reconnect to the emergency caller if the emergency call is cut off or if the PSAP needs to talk to the caller again. The emergency call is routed to the PSAP based on the location information that is associated with this number. For multiline phone systems, such as an office system, the ELIN can be associated with more than one telephone by grouping the phones in an ELIN group. An ELIN group in Emergency Call Handler identifies a location. The ELINs under this ELIN group must be mapped to the location in the ALI database. Each location should have as many ELINs created as needed to support simultaneous emergency calls. For example, to support five simultaneous calls, five ELINs would be needed in an ELIN group. Emergency Call Handler supports a maximum of 100 ELINs per cluster. Make sure that the mapping of ELIN to the original called party is active until the ELIN is used for the next emergency call from the same location. If the ELIN mapping is not used, the DN will be active for a maximum period of 3 hours only. Note Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 637