LPG. Calls routed via the ESInet and delivered to a legacy PSAP will undergo signaling interworking to convert the incoming Session Initiation Protocol (SIP) signaling to the traditional Multi-Frequency (MF) or Enhanced Multi-Frequency (E-MF) signaling supported by the legacy PSAP. The LPGs will allow legacy PSAPs to receive calls and retrieve Automatic Location Identification (ALI) data the same way they do today. The LPG will also support an ALI interface over which it can receive and respond to ALI queries from legacy PSAPs. Interfaces to a Location Information Server (LIS) and a Legacy Network Gateway (LNG) will also be supported by the LPG so that it can perform a de-referencing operation if the SIP signaling from the ESInet includes a location-by-reference. In addition, the LPG will support an Emergency Call Routing Function (ECRF) interface to facilitate certain emergency call transfer scenarios, as well as interfaces to the Call Information Databases (CIDBs) to provide access to additional non-location data associated with the emergency call, if a reference to such data is provided in incoming SIP signaling.
Appears in 3 contracts
Sources: Centurylink 9 1 1 Agreement, 9 1 1 Agreement, 9 1 1 Agreement