Framework for Emergency Calling Using Internet Multimedia
RFC 6443

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• 13

Internet Engineering Task Force (IETF)                          B. Rosen
Request for Comments: 6443                                       NeuStar
Category: Informational                                   H. Schulzrinne
ISSN: 2070-1721                                              Columbia U.
                                                                 J. Polk
                                                           Cisco Systems
                                                               A. Newton
                                                      TranTech/MediaSolv
                                                           December 2011

       Framework for Emergency Calling Using Internet Multimedia

Abstract

   The IETF has standardized various aspects of placing emergency calls.
   This document describes how all of those component parts are used to
   support emergency calls from citizens and visitors to authorities.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6443.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Rosen, et al.                 Informational                     [Page 1]
RFC 6443                Emergency Call Framework           December 2011

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................6
   3. Overview of How Emergency Calls Are Placed ......................8
   4. Which Devices and Services Should Support Emergency Calls? .....12
   5. Identifying an Emergency Call ..................................12
   6. Location and Its Role in an Emergency Call .....................14
      6.1. Types of Location Information .............................16
      6.2. Location Determination ....................................17
           6.2.1. User-Entered Location Information ..................17
           6.2.2. Access Network "Wire Database" Location
                  Information ........................................18
           6.2.3. End System Measured Location Information ...........19
           6.2.4. Network Measured Location Information ..............19
      6.3. Who Adds Location, Endpoint, or Proxy? ....................20
      6.4. Location and References to Location .......................20
      6.5. End System Location Configuration .........................21
      6.6. When Location Should Be Configured ........................22
      6.7. Conveying Location ........................................23
      6.8. Location Updates ..........................................24
      6.9. Multiple Locations ........................................24
      6.10. Location Validation ......................................25
      6.11. Default Location .........................................26
      6.12. Location Format Conversion ...............................26
   7. LIS and LoST Discovery .........................................26
   8. Routing the Call to the PSAP ...................................27
   9. Signaling of Emergency Calls ...................................29
      9.1. Use of TLS ................................................29
      9.2. SIP Signaling Requirements for User Agents ................30
      9.3. SIP Signaling Requirements for Proxy Servers ..............30
   10. Call Backs ....................................................30
   11. Mid-Call Behavior .............................................31
   12. Call Termination ..............................................31
   13. Disabling of Features .........................................32
   14. Media .........................................................32
   15. Testing .......................................................32