NG911 NENA terminology

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NG911 NENA terminology
2014-11-03 14:31:58
Terminology for "next generation" spatial routing and all that crap.
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  1. CIDB (Call Information Database)
    • A call that passes through an
    • origination network or service provider of any kind must have a Call info
    • header with a URI that resolves to an Additional Call Data structure. The
    • database that dereferences this URI is a Call Information Database.  The additional information is accessed via an
    • HTTP request using a specific "Additional Data" query
  2. ECRF (Emergency Call
    Routing Function)
    • The ECRF is a functional
    • element in an ESInet which is a LoST protocol server where location information
    • (either civic address or geo-coordinates) and a service URN (e.g.,
    • PSAP/Routing, Police, Fire, Medical) are used to determine a URI associated
    • with service requested.  It also contains
    • point data to support queries for a URI associated with an Additional Location
    • Data Repository for a specific location.
  3. ESInet (Emergency
    Services IP Network)
    • An IP-based inter-network
    • (network of networks) shared by all agencies that may be involved in any
    • emergency.  It provides the IP transport
    • infrastructure upon which independent application platforms and core services
    • can be deployed.  The term defines the
    • network, not the services that ride the network.
  4. ESRP (Emergency
    Services Routing Proxy)
    • An i3 functional element
    • which is a SIP proxy server that selects the next hop routing within the ESInet
    • based on location and policy. There is an ESRP on the edge of the ESInet. There
    • is usually an ESRP at the entrance to an NG9-1-1 PSAP (terminating ESRP). There
    • may be one or more intermediate ESRPs between them.
  5. HELD    (HTTP-Enabled Location Delivery)
    • A protocol defined by the
    • IETF (Internet Engineering Task Force) to deliver location using HTTP
    • transport.  It is used to retrieve
    • PIDF-LO from the LIS.
  6. LIS (Location
    Information Server)
    • A Location Information Server supplies location,
    • in the form of a PIDF-LO (location by value) or a location URI (location by
    • reference), which is placed into the Geolocation header in the initial SIP
    • message.  The LIS also provides a
    • “dereference” service for a location URI it supplies: given the URI, the LIS
    • provides the location value as a PIDF-LO. 
    • PIDF-LO can be provided in geodetic and/or civic forms. Per the i3
    • specification, clients utilize the HELD interface to communicate with the LIS
  7. LIF (Location Interwork
    • A subcomponent of the LNG,
    • the LIF is the functional component of a Legacy Network Gateway which is
    • responsible for taking the appropriate information from the incoming signaling
    • (i.e., calling number/ANI, ESRK, cell site/sector) and using it to acquire
    • location Information.  The location
    • information is used to route the emergency call and to provide location
    • information to the PSAP.
  8. LNG (Legacy Network
    • A Legacy Network Gateway is a
    • signaling and media interconnection point between callers in legacy
    • wireline/wireless originating networks and the i3 architecture. The Legacy
    • Network Gateway logically resides between the originating network and the
    • ESInet and allows i3 PSAPs to receive emergency calls from legacy originating
    • networks.
  9. LoST (Location to
    Service Translation)
    • A protocol that takes
    • location information and a Service URN and returns a URI. In NG9-1-1, used as
    • the protocol for interfacing with the ECRF and LVF.
  10. LVF (Location
    Validation Function)
    • The NENA i3 element that validates
    • location information via LoST transactions. 
    • The LVF ensures that a civic address can be used to discern a route to a
    • PSAP and the address is dispatchable. 
    • The Intrado solution will include a map-based interface to aid in the
    • location validation process.
  11. NIF (NG9-1-1 specific Interworking Function)
    • A subcomponent of the LNG,
    • it’s the functional component that provides processing of the legacy incoming
    • call signaling, which includes the 10-digit key (e.g., TN, pANI, etc) that will
    • be used as input for location retrieval, and once received, uses the location
    • to determine a target ESRP.
  12. PIDF-LO (Presence
    Information Data Format – Location Object)
    • Provides an XML structure
    • that defines a location, in either geographic or civic address format.   It’s often discussed as a transported in a
    • SIP body or via the HELD protocol.
  13. PIF (Protocol
    Interworking Function)
    • A subcomponent of the LNG and
    • LPG, it’s the functional component of a Legacy Network Gateway or Legacy PSAP
    • Gateway that interworks legacy PSTN signaling such as ISUP or CAMA, with SIP
    • signaling
  14. SIF (Spatial
    Information Function)
    • The SIF is an interface
    • between an authoritative copy of GIS data and functional elements that will use
    • that data (e.g., an ECRF, LVF).  The
    • Intrado SIF performs validation and data normalization functions prior to the
    • provisioning of the data into subsequent functional elements.
  15. SIP (Session Initiation
    • An IETF defined protocol
    • (RFC3261) that defines a method for establishing multimedia sessions over the
    • Internet. Used as the call signaling protocol in VoIP, i2 and i3
  16. URI (Uniform Resource
    • A predictable formatting of
    • text used to identify a resource on a network (usually the Internet).  E.g., the PSAP URI returned from a LoST
    • routing request to the ECRF would direct the ESRP to the appropriate PSAP for
    • the location it provided to the ECRF.