Emergency Location Identification Number (ELIN) Gateway Support
An ELIN-capable gateway supports connection to a qualified E911 service provider. The connection supports PSTN-based E911 functions, including user callback when there is a disconnect. Enterprises often deploy ELIN numbers based on physical location to locate the physical source of a 911 call. By using multiple ELINs, an enterprise can support multiple, simultaneous E911 calls.
Typically, an enterprise purchases multiple ELIN numbers. An ELIN gateway replaces VoIP extension URIs with ELIN numbers and maintains the mapping. For example, if an emergency service replied to a VoIP URI without using an ELIN gateway, the reply would be delayed or fail. An ELIN gateway can use its mapping to translate the ELIN number back to the VoIP extension from within the enterprise session network. The gateway can immediately forward the call back to the original client.
The Oracle® Enterprise Session Border Controller supports E911 ELIN for Lync-enabled Enterprises using the ELIN_Gateway SPL option. Enable this option in the global SPL configuration. The Oracle® Enterprise Session Border Controller supports up to 300 ELIN numbers simultaneously and it can reuse numbers allowing a greater number of emergency calls.