Interim VoIP Architecture for Enhanced 9-1-1 Services (i2)
over Internet Protocol (VoIP) is poised to become the predominant
technology used in the telecommunications industry. As the public adopts
VoIP, E9-1-1 calls will increasingly originate from VoIP users. Some
VoIP telecommunications service provider networks, however, are not
natively compatible with the existing E9-1-1 infrastructure. This
document was developed to outline an interim architecture to connect
callers in the IP domain with Public Safety Answering Points (PSAPs)
supported by the existing E9-1-1 Service Provider network.
This document is the NENA recommended standard for the
i2 architecture to support the interconnection of VoIP domains with the
existing Emergency Services Network infrastructure in support of the
migration toward end-to-end emergency calling over the VoIP networks
between callers and PSAPs.
This document provides an overview of the VoIP
architecture, functional elements, and interfaces, as well as the
interface specifications necessary for interconnection with the existing
Emergency Services Network infrastructure.
This document does not include specifications for the
methods used to determine location nor how the endpoint actually
VoIP is being introduced into the North American
environment by VoIP Service Providers (VSPs). NENA and a number of the
VSP’s acting through the Voice on the Net (VON) Coalition reached
agreement to support current NENA and industry work towards long-term
solutions that include (a) delivery of 9-1-1 calls to the proper PSAP;
(b) providing callback number/contact information to the PSAP; (c)
providing the location of the caller; and (d) PSAPs having direct IP
connectivity. The initial standards development work of the NENA
VoIP/Packet Committee was to be completed by the end of 1Q05. This
architecture embodies that initial work.
This recommended standard is being provided to facilitate
the development and implementation of interoperable, standard equipment
and processes to support VoIP emergency services calling throughout
Use of this document will:
- Ensure that equipment and service providers that conform to these recommendations will have a solution that is interoperable,
- Foster development of network elements and processes that can be reused in the architecture that supports end-to-end IP calling to the PSAP.