Emergency Service Zone (ESZ) Routing Database (ERDB) Generic Requirements
Document Number GR-3119
Issue Number 04
Issue Date Oct 2008
ABSTRACT: Issue 4 of GR-3119, Emergency Service Zone (ESZ) Routing Database (ERDB) Generic Requirements, replaces Issue 3.
The National Emergency Number Association (NENA) has been active in the definition of a suite of solutions to enable emergency calls
originated by Voice over Internet Protocol (VoIP) users to be routed to the appropriate Public Safety Answering Point (PSAP) for the
geographic location from which the call was originated. The Long Term Definition (LTD) Working Group (WG) of NENA has identified
high-level requirements and developed an architecture for an end-to-end Internet Protocol (IP) solution. The VoIP Migratory Working
Group (VMWG) of NENA has defined a near-term solution that provides for migration toward the long-term view, while making use of the
existing conventional E9-1-1 System Service Provider infrastructure. This is referred to as the i2 Solution. The NENA i2.5 Working
Group (WG) has been working to update the i2 Solution to address gaps in the i2 Solution definition, and to reflect industry requests
for changes and enhancements to the i2 Solution. In the i2 Solution, it has been assumed that a VoIP Service Provider (VSP) will
participate in the handling of emergency call originations. The i2 Solution is expected to support the basic E9-1-1 Service
capabilities that are available to wireline and wireless customers today, while minimizing the impact on the E9-1-1 System Service
Provider infrastructure and PSAPs.
The i2 Solution defined by the NENA VMWG and updated by the NENA i2.5 WG includes a number of new functional elements to enable the
routing of VoIP-originated emergency calls and the delivery of the associated call and location-related information to the PSAP. One
critical network element that is involved in selectively routing the VoIP emergency call is the Emergency Service Zone (ESZ) Routing
GR-3119 provides generic requirements for an Emergency Services Zone (ESZ) Routing Database (ERDB) to support VoIP-originated calls.
- Functional requirements for the ERDB
- Interface requirements for the interfaces supported by the ERDB
- Data management requirements
This document provides specifications for a new Emergency Service Zone Routing Data Base (ERDB) element used to support location-based
routing of VoIP emergency calls to an appropriate interconnection point with the emergency services infrastructure in the NENA i2
Solution. It may be of use to operators and suppliers of ERDB elements in developing and deploying the ERDB, and also to the Public
This new element is a critical component of the NENA i2 Solution for support of VoIP emergency calling. Without this component, VoIP
emergency calls are today routed to non-emergency lines, causing delays in service to VoIP callers and impacting Public Safety call
answering policies and procedures.
Issue 4 includes:
- Updates throughout to describe procedures related to the delivery of geo-coded location information on emergency calls where
geo-based default routing was applied at the ERDB
- Updates to reflects the modifications made to the mechanisms for ERDB steering by the NENA i2.5 WG
- Updates to bring the v8 interface definition into alignment with current definitions provided in the draft update to NENA
- Modifications to align the terminology used in this document with the terminology used in the draft update to NENA
This GR also includes one or more Issue Lists Reports (ILRs) that detail open or closed technical issues in the main document. The
ILR(s) are automatically sent free of charge to the GR document purchaser.
When using GR-3119, you may want to refer to GR-3118, GR-350, GR-2956, GR-3112, GR-3129, GR-3130, and
GR-3156 as well as various NENA documents and various other industry standards.
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