E9-1-1 Default Assignment and Call Routing Functions

Document Information
Full name: 

NENA Standard for Enhanced 9-1-1 (E9-1-1) Default Routing Assignments and Functions

Document type: 


Standard number: 

03-008 v1

Document description: 

This “NENA Recommended Standard for E9-1-1 Default Assignment and Call Routing Functions” document provides an overview of various database and network specifications and requirements related to Default Routing of 9-1-1 calls. It is intended to help local authority; database and/or network administrators select a model in the development of standard default routing arrangements. It identifies and defines methods used to assign defaults and route 9-1-1 calls when circumstances prevent normal selective routing. Each approach is used during a specific set of circumstances; similarly a specific set of circumstances shall determine which approach is most appropriate.

While default routing schemes are critical to an E9-1-1 compliant set of database and network design, throughout much of the 9-1-1 community, there is misunderstanding from time to time about the methods used to route 9-1-1 calls when circumstances prevent typical routing. This document aims at describing such circumstances and the method(s) used in such circumstances which shall give the community a common foundation for discussing default call routing schemes.

It shall be recognized that the rationale for default management within database and network components and for default call routing is in an evolution with the advent of new communication mechanisms generating the end of local rate center number assignment restriction and the introduction of geographic number portability.

Use of this “NENA E9-1-1 Default Assignment and Call Routing Functions” Standard will:

  • foster a common understanding of terms used in the assessment, determination and deployment of default call routing for emergency services;
  • foster fundamental default management rationale for databases;
  • explain default call routing ;
  • foster increased communication regarding default call routing selections in the planning of E9-1-1 deployments;
  • provide alternatives to switch/network vendors regarding desired operational attributes; and
  • foster a common set of standards to complete 9-1-1 calls to designated PSAPs when normal selective routing cannot be invoked.
Committee Information
Committee Name(s): 

Technical – Network

Committee type: 


Document Dates


Document Size
E9-1-1 Default Assignment and Call Routing Functions.pdf 198.77 KB