VoIP Emergency Calls

Duration1 day (flexible, especially the duration of the practical part)
Course Objectives

The participant gets an overview of the IETF’s emergency calling framework (ECRIT framework), the current development and also collects first practical experience.

Target AudienceEveryone involved in emergency calling (e.g. VoIP providers, software and hardware developers, operators of PSAPs, network operators …)
PrerequisitesVoIP and SIP knowledge advantageous

Emergency calls are an especially important feature of the public telephony system. These calls are placed by an individual to avert threat to life or physical condition and to property by calling an authority, e.g. the police. In almost any emergency situation, the timely arrival of action forces is essential. Countless times, emergency callers reach emergency call centres – via fixed line phones, mobile phones or Internet phones. Calls placed via the Internet (e.g. Voice over IP – VoIP), are often not handled properly nowadays.

This training explains the reasons and shortcomings of today’s VoIP emergency calling. A detailed discussion of the Internet Engineering Task Force (IETF) emergency calling framework (ECRIT framework) is the main part of the training. Certainly all current topics and developments will be covered.

This training can be ideal to prepare for next generation emergency calling (often referred to as NG911 or NG112), equally interesting for operators of public safety answering points/emergency calling centres, providers of VoIP services, access network operators as well as VoIP software and hardware manufacturers. Furthermore, this training could be also be used to gather knowledge for a first step in location based servers by using the same architecture as for emergency calling, realized utilizing the same protocols.

Training Itinerary

  • Introduction

    • Emergency calling: current situation, regulatory considerations (for selected countries)
    • Hurdles and difficulties for VoIP emergency calling
    • Importance of location information
    • Overview of standartisation work

  • Requirements for an emergency calling system and emergency calling centres
  • The IETF emergency calling framework (ECRIT Framework)

    • Location Information/Format of location information
    • Emergency services/Service URNs
    • Detecting the responsible emergency centre (LoST protocol)
    • Detecting emergency calls
    • Structure of a emergency call SIP Invite message

  • Acquisition of location information

    • Location configuration/location determination
    • Protocols for location configuration

      • HELD
      • DHCP
      • LLDP-MED

    • Comparision of the procols and conversion
    • How to actually determine the location

  • Demonstration of VoIP emergency calling prototype open source software and tools

    • Demo of available emergency calling prototypes
    • Demo of all necessary steps of the ECRIT architecture for VoIP emergency calling

  • Review of the emergency calling architecture

    • Open issues
    • Implementation difficulties