Emergency Services Interconnection Forum

ESIF develops Next Generation 911 (NG911) and location accuracy requirements and solutions and is where the industry comes together in a voluntary open forum to identify and resolve technical and operational issues to facilitate interconnection of emergency services networks with other networks (e.g., wireline, cable, satellite, Internet, etc.). ESIF members comprise industry, government, standards, and public safety organizations.


  • In September 2015, the 9-1-1 Location Technologies Test Bed, LLC announced the selection of ATIS to serve as the Program Manager for the 9-1-1 location accuracy test bed. View a summary of the test bed.

  • ESIF Emergency Services & Methodologies (ESM) Subcommittee is currently developing solutions for:

    • Determination of Test Bed Location(s) and Blending Methodologies for Assessing Accuracy Compliance
    • Addressing the establishment of a test bed that is representative of indoor and outdoor environments and captures certain performance attributes including: location accuracy, latency, and reliability. The standard will address geographic locations that will comprise the test bed, the geographic regions where live 911 calls will be monitored, how different morphologies and regions will be combined into a comprehensive accuracy performance metric, and will identify potential methodology differences between testing for compliance and technology evaluation.
    • Positioning Method Source Codes for Current and Emerging Location Technologies
    • Identifying and requesting positioning method source codes for current and emerging location technologies including likely hybrid combinations.
    • Considerations and Methodologies for Crowd-Sourced and Dispatchable Location Technologies
    • Addressing the unique considerations and methodologies to be applied to testing crowd-sourced (Wi-Fi and Bluetooth) location technologies and to testing dispatchable location methods, as well as determining veracity of the location.
    • Vertical Axis Measurement Test Methodology
    • Assessing barometric, Wi-Fi, and other possible vertical axis determination solutions with emphasis placed on calculated solutions.

Susan Sherwood, Verizon Wireless

First Vice Chair
Roger Hixson, NENA

Second Vice Chair
Roger Marshall, TCS

Industry Advisors
Khaled Dessouky, ComVerity
Bill Horne, Tarrant County 9-1-1 District
Ryan Jensen, T-Mobile