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Versions: 01 02 03 04 RFC 6993

Network Working Group                                     P. Saint-Andre
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                            May 14, 2013
Expires: November 15, 2013


Instant Messaging and Presence Purpose for the Call-Info Header Field in
                 the Session Initiation Protocol (SIP)
                   draft-saintandre-impp-call-info-03

Abstract

   This document defines and registers a value of "impp" ("instant
   messaging and presence protocol") for the "purpose" header field
   parameter of the Call-Info header field in the Session Initiation
   Protocol (SIP).

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on November 15, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.



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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Security Considerations . . . . . . . . . . . . . . . . . . . . 3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     4.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     4.2.  Informative References  . . . . . . . . . . . . . . . . . . 4
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . . . 4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 4









































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1.  Introduction

   To improve interoperability among real-time communication endpoints
   that support the combined use of the Session Initiation Protocol
   (SIP) [RFC3261] and the Extensible Messaging and Presence Protocol
   (XMPP) [RFC6120] (so-called "CUSAX" endpoints [I-D.ivov-xmpp-cusax]),
   it can be helpful to communicate the endpoint's SIP address over XMPP
   and the endpoint's XMPP address over SIP to provide hints about the
   endpoints communication capabilities.  The former feature is enabled
   by an XMPP extension protocol called Reachability Addresses
   [XEP-0152].  As to the latter feature, discussion in the SIP
   community led to the conclusion that it would be best to use the
   Call-Info header field [RFC3261] with a value of "impp" ("instant
   messaging and presence protocol") for the "purpose" header field
   parameter.  An example follows.

   Call-Info: <xmpp:juliet@example.com> ;purpose=impp

   Although CUSAX endpoints constitute the primary use case for the
   "impp" purpose, a Uniform Resource Identifier (URI) [RFC3986] for an
   instant messaging and presence protocol other than XMPP could be
   included in the Call-Info header field.


2.  Security Considerations

   Advertising an endpoint's XMPP address over SIP could inform
   malicious entities about an alternative attack vector.  Because the
   "purpose" header field parameter could be spoofed, the receiving
   endpoint ought to check the value against an authoritative source
   such as a user directory.  Clients can integrity protect and encrypt
   this header field using end-to-end mechanisms such as S/MIME or hop-
   by-hop mechanisms such as TLS.


3.  IANA Considerations

   This document defines and registers a new predefined value "impp" for
   the "purpose" header field parameter of the Call-Info header field.
   The IANA can complete this action by adding this RFC as a reference
   to the line for the header field "Call-Info" and parameter name
   "purpose" in the Header Field Parameters and Parameter Values section
   of the Session Initiation Protocol (SIP) Parameters registry:

     Header Field: Call-Info
     Parameter Name: purpose
     Predefined Values: Yes
     Reference: [this document]



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4.  References

4.1.  Normative References

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              June 2002.

   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              RFC 3986, January 2005.

   [RFC6120]  Saint-Andre, P., "Extensible Messaging and Presence
              Protocol (XMPP): Core", RFC 6120, March 2011.

4.2.  Informative References

   [I-D.ivov-xmpp-cusax]
              Ivov, E., Saint-Andre, P., and E. Marocco, "Combined Use
              of the Session Initiation Protocol (SIP) and the
              Extensible Messaging and Presence Protocol (CUSAX)",
              draft-ivov-xmpp-cusax-05 (work in progress), May 2013.

   [XEP-0152]
              Saint-Andre, P. and J. Hildebrand, "Reachability
              Addresses", XSF XEP 0152, February 2013.


Appendix A.  Acknowledgements

   Thanks to Gonzalo Camarillo, Keith Drage, Saul Ibarra, Emil Ivov,
   Cullen Jennings, Olle Johanssen, Paul Kyzivat, Gonzalo Salgueiro,
   Dean Willis, and Dale Worley for their input.  Elwyn Davies,
   Salvatore Loreto, and Glen Zorn completed reviews on behalf of the
   General Area Review Team, Applications Area Directorate, and Security
   Directorate, respectively.  Thanks to Yana Stamcheva for her helpful
   comments and for shepherding the document.













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Author's Address

   Peter Saint-Andre
   Cisco Systems, Inc.
   1899 Wynkoop Street, Suite 600
   Denver, CO  80202
   USA

   Phone: +1-303-308-3282
   Email: psaintan@cisco.com









































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