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Public Safety Answering Point (PSAP) Callback (RFC7090) Disclosure Number: IPCOM000236305D
Original Publication Date: 2014-Apr-01
Included in the Prior Art Database: 2014-Apr-18
Document File: 36 page(s) / 38K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

H. Schulzrinne: AUTHOR [+3]


Summoning police, the fire department, or an ambulance in emergencies is one of the fundamental and most valuable functions of the telephone. As telephone functionality moves from circuit-switched telephony to Internet telephony, its users rightfully expect that this core functionality will continue to work at least as well as it has for the legacy technology. New devices and services are being made available that could be used to make a request for help and that are not traditional telephones. Users are increasingly expecting them to be used to place emergency calls.

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Internet Engineering Task Force (IETF)                    H. Schulzrinne Request for Comments: 7090                           Columbia University Category: Standards Track                                  H. Tschofenig ISSN: 2070-1721                                                              C. Holmberg                                                                 Ericsson                                                                 M. Patel                                       Huawei Technologies (UK) Co., Ltd.                                                               April 2014

              Public Safety Answering Point (PSAP) Callback


   After an emergency call is completed (terminated either prematurely    by the emergency caller or normally by the call taker), the call    taker may feel the need for further communication.  For example, the    call may have been dropped by accident without the call taker having    sufficient information about the current state of an accident victim.    A call taker may trigger a callback to the emergency caller using the    contact information provided with the initial emergency call.  This    callback could, under certain circumstances, be treated like any    other call and, as a consequence, it may get blocked by authorization    policies or may get forwarded to an answering machine.

   The IETF emergency services architecture specification already offers    a solution approach for allowing Public Safety Answering Point (PSAP)    callbacks to bypass authorization policies in order to reach the    caller without unnecessary delays.  Unfortunately, the specified    mechanism only supports limited scenarios.  This document discusses    shortcomings of the current mechanisms and illustrates additional    scenarios where better-than-normal call treatment behavior would be    desirable.  We describe a solution based on a new header field value    for the SIP Priority header field, called "psap-callback", to mark    PSAP callbacks.

Schulzrinne, et al.          Standards Track                    [Page 1]
 RFC 7090                      PSAP Callback                   April 2014

 Status of This Memo

   This is an Internet Standards Track document.

   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 Enginee...