NG911 NENA terminology
Card Set Information
NG911 NENA terminology
Terminology for "next generation" spatial routing and all that crap.
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
ECRF (Emergency Call
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.
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.
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.
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.
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
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.
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
LoST (Location to
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.
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.
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.
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.
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
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.
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
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.