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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                          April 07, 2013
Expires: October 09, 2013


 Instant Messaging and Presence Purpose for the Call-Info Header in the
                   Session Initiation Protocol (SIP)
                   draft-saintandre-impp-call-info-01

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 October 09, 2013.

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

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


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 [RFC3261] with a value of "impp" ("instant messaging
   and presence protocol") for the "purpose" header field parameter.
   This document defines and registers the "impp" value.

   (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.)

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.

3.  IANA Considerations

   The IANA is requested to add a new predefined value "impp" for the
   "purpose" header field parameter of the Call-Info header field, by
   adding this RFC as a reference to the line for the header field
   "Call-Info" and parameter name "purpose":




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


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-04 (work in progress), April 2013.

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

Appendix A.  Acknowledgements

   Thanks to Keith Drage, Saul Ibarra, Emil Ivov, Cullen Jennings, Olle
   Johanssen, Paul Kyzivat, Gonzalo Salgueiro, Dean Willis, and Dale
   Worley for their input.  Thanks to Yana Stamcheva for her helpful
   comments and for shepherding the document.

Author's Address









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   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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