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SS7 Guidelines for Wireline & VoIP
Full Name:
SS7 Guidelines for Wireline and VoIP Emergency Services Gateway Interconnection to 9-1-1 Selective Routers Technical Information Document
Document Type: Informational
Standard Number: 03-503 v1

This document is a guide to orient the SS7 translation engineer/technician on the nature of translations required in the SS7 messaging between the E9-1-1 Selective Router and the various network elements that seek to connect to the router. These elements can include both wireline end offices and VoIP Emergency Services Gateways (ESGW) owned or operated by local exchange carriers (ILECs and CLECs), VoIP Service Providers (VSPs) and/or the E9-1-1 Service System Providers (SSPs). It is not in the scope of this document to explain exact details of any particular 9-1-1 SR, but to act as a way to understand the dynamics of these types of translations. This document is secondary to any network disclosure or other translation policy guides from any 9-1-1 Service System Provider. The reader of this document is encouraged to contact the 9-1-1 Service System Provider for any detailed questions on SS7 translations or policy details.

The purpose of this Technical Information Document (TID) is to identify and reflect current trends, not to catalog every SS7 translation requirement for every 9-1-1 Service System Provider. The SS7 Implementation Improvement Working Group seeks to give the reader the knowledge required to better understand and implement service, using supported interconnection methods that exist in the field today.

Implementation of this TID will provide a consistent set of guidelines for local exchange carriers (ILECs and CLECs),VoIP Service Providers (VSPs) and the E9-1-1 Service System Providers (SSPs) in the SS7 interconnection between an originating switch or Emergency Services Gateway (ESGW) and E9-1-1 Selective Router (SR) to support the delivery of customer-originated emergency calls.

This TID is intended, in conjunction with other NENA Standards, to support the provision of fully functional E9-1-1 service for the growing number of Voice over IP/Voice over Internet subscribers. It provides information and suggested methods to accomplish the required interconnection in a standardized and reliable manner.

Committee Name(s): Network

Created: 10/20/2005

09/12/2014:   The methodology described in this document is still in use in some 9-1-1 systems, but is expected to be replaced as systems transition to newer technologies.  While still valid for the systems that use this technology, this document will no longer be reviewed or updated on an annual basis.

SS7 Guidelines for Wireline and VoIP
(c) 2013-14 NENA - National Emergency Number Association, Alexandria, VA
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