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An Extension to the Session Initiation Protocol (SIP) for Request History Information
RFC 7044

Internet Engineering Task Force (IETF)                         M. Barnes
Request for Comments: 7044                                       Polycom
Obsoletes: 4244                                                 F. Audet
Category: Standards Track                                          Skype
ISSN: 2070-1721                                              S. Schubert
                                                                     NTT
                                                           J. van Elburg
                                              Detecon International Gmbh
                                                             C. Holmberg
                                                                Ericsson
                                                           February 2014

       An Extension to the Session Initiation Protocol (SIP) for
                      Request History Information

Abstract

   This document defines a standard mechanism for capturing the history
   information associated with a Session Initiation Protocol (SIP)
   request.  This capability enables many enhanced services by providing
   the information as to how and why a SIP request arrives at a specific
   application or user.  This document defines an optional SIP header
   field, History-Info, for capturing the history information in
   requests.  The document also defines SIP header field parameters for
   the History-Info and Contact header fields to tag the method by which
   the target of a request is determined.  In addition, this
   specification defines a value for the Privacy header field that
   directs the anonymization of values in the History-Info header field.
   This document obsoletes RFC 4244.

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 Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in 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/rfc7044.

Barnes, et al.               Standards Track                    [Page 1]
RFC 7044                      History-Info                 February 2014

Copyright Notice

   Copyright (c) 2014 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
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   to this document.  Code Components extracted from this document must
   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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Barnes, et al.               Standards Track                    [Page 2]
RFC 7044                      History-Info                 February 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   4
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  History-Info Header Field Protocol Structure  . . . . . . . .   7
     5.1.  History-Info Header Field Example Scenario  . . . . . . .  10
   6.  User Agent Handling of the History-Info Header Field  . . . .  12
     6.1.  User Agent Client (UAC) Behavior  . . . . . . . . . . . .  12
     6.2.  User Agent Server (UAS) Behavior  . . . . . . . . . . . .  12
     6.3.  Back-to-Back User Agent (B2BUA) Behavior  . . . . . . . .  12
   7.  Proxy/Intermediary Handling of History-Info Header Fields . .  13

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