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Versions: 00 01 02 03 04 RFC 6993

Network Working Group                                     P. Saint-Andre
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                          March 10, 2013
Expires: September 11, 2013


 Instant Messaging and Presence Purpose for the Call-Info Header in the
                   Session Initiation Protocol (SIP)
                   draft-saintandre-impp-call-info-00

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 September 11, 2013.

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Table of Contents

   1.  Definition  . . . . . . . . . . . . . . . . . . . . . . . . .   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.  Definition

   Developers of real-time communication endpoints that implement both
   the Session Initiation Protocol (SIP) [RFC3261] and the Extensible
   Messaging and Presence Protocol (XMPP) [RFC6120] sometimes wish to
   communicate the endpoint's SIP address over XMPP and communicate the
   endpoint's XMPP address over SIP.  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 of using the Call-Info header [RFC3261], with a predefined
   value of "impp" ("instant messaging and presence protocol") for the
   "purpose" header.  Therefore this document defines and registers the
   "impp" value for the "purpose" parameter.

   (Although the primary use case for the "impp" purpose is dual-stack
   SIP/XMPP endpoints [I-D.ivov-xmpp-cusax], a Uniform Resource
   Identifier (URI) [RFC3986] for instant messaging and presence
   protocols 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.

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":

   Header Field: Call-Info
   Parameter Name: purpose
   Predefined Values: yes
   Reference: [RFC3261][RFC5367][RFC XXXX]




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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., Marocco, E., and P. Saint-Andre, "Combined Use
              of the Session Initiation Protocol (SIP) and the
              Extensible Messaging and Presence Protocol (CUSAX)",
              draft-ivov-xmpp-cusax-03 (work in progress), February
              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.

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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