What does the Location Information Server (LIS) provide?

• A. A functional entity that provides locations of endpoints. Can provide location by reference or location by value and if the latter in geo or civic forms.
• B. The first functional element encountered after entering the ESInet.
• C. A protocol that takes location information and a Service URN and returns a URL.
• D. A predictable formatting of text used to identify a resource on a network (usually the internet).

Answer: (B)

Location Information Server provides the location data for endpoints to support emergency routing and caller location within the NG9-1-1 ESInet. It can supply location by reference (a handle or pointer to a stored location record) or by value (the actual location data). When provided by value, the data can be in geometric form (geo coordinates) or in civic form (a structured street address). This capability is what lets PSAPs and routing services determine where a caller or device is located and route the call appropriately. It’s not simply the first element encountered after entering the ESInet, nor is it a protocol that converts a Service URN to a URL or a generic resource-identifying URL format; those describe different concepts, whereas LIS specifically serves location information for emergency services.