NENA Standard Generic Requirements for an Enhanced 9-1-1 Selective
document is intended to define the Generic Feature Requirements of an
Enhanced 9-1-1 Selective Routing switch. For legibility, this document
describes the Selective routing switch as a single switching element
even though the NENA Functional Entity Model describes the Selective
Routing function as it fits into the E9-1-1 network as a whole. This
allows the developer to create the E9-1-1 function as a centrally
located switching entity, or as distributed network elements. It also
distinguishes which features and characteristics are fundamental to an
Enhanced 9-1-1 system, and which, through either current or anticipated
advancement of the industry, are deemed optional or additional features
of the 9-1-1 network.
Although traditional methods are described for many of
the feature requirements of an Enhanced 9-1-1 Selective Routing switch,
the method of how the selective routing switch performs that function is
left to the creator of the Selective Routing entity. Therefore,
whenever this document describes a selective routing switch as a single
switching element, it should be understood that this is to aid in
readability and describing the requirements. As the 9-1-1 network
evolves and matures, the features and requirements of the selective
routing function may ultimately be spread across multiple physical
components, and look more like the NENA Functional Entity Model than a
single switching element.
It is also understood that the manufacturer of a
selective routing switch could either use recognized standards and
methodology to perform the functions, or could develop (and document)
new methods or interfaces between the router and other network
components needed to perform the outlined selective routing features.
This document further defines each characteristic as
being either a standard element (i.e., fundamental to most/all selective
routing switches) or as an optional or enhanced characteristic (i.e.,
an additional offering by one or more vendors) to the selective routing
switch. This document is forward looking, and as such, many features and
capabilities of the 9-1-1 network (necessary for the future) are
described, even though they may not be currently deployed throughout the
9-1-1 network at this time.
This document describes the features and/or
characteristics generally associated with the typically accepted version
of an "Enhanced 9-1-1 Selective Router.” Individual cases, including
local policies or regulatory constraints may deem many of these features
to be unnecessary to meet 9-1-1 public safety needs, and as such, they
may not be offered by the 9-1-1 system service provider. This document
is applicable to all types of 9-1-1 calls regardless of the caller’s
originating service type (i.e., wireless, land-line, POTS, Centrex, PBX,
ISDN, VOIP, etc.). It focuses on the routing and handling of the call
based on the fundamental concept that the location of the caller is
inferred through the TN (ANI) associated with the call setup. Although
there are many different methods to establish the call, the outcome is
that the calls can all be discussed in this uniform context throughout
Users, manufacturers, and system designers that implement
the use of this document will be able to communicate and provide
Enhanced 9-1-1 Selective Routing services and features in a more
consistent and uniform manner across all sectors of the 9-1-1 industry.
This document can provide a common framework and terminology as to what
is required and/or expected in an Enhanced 9-1-1 selective routing
switch or network. Furthermore, this document identifies the fundamental
characteristics of an Enhanced 9-1-1 network, which in most cases are
the requirements for any 9-1-1 system provider when offering services to
the Public Safety community.
Use of this NENA document will:
- Provide a common frame of reference between all parties involved in the development, design, manufacture, installation, discussion, ordering, and use of an Enhanced 9-1-1 system or network.
- Allow for a more seamless deployment of Enhanced 9-1-1 services to the public safety community and end user, including the interoperability between 9-1-1 systems, and other telecommunications service providers.
- Allow 9-1-1 system providers to offer customized packages to its users through a common platform that is hardware independent.