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

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Document Type Active Internet-Draft (individual)
Last updated 2013-04-16 (latest revision 2013-04-07)
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Responsible AD Gonzalo Camarillo
IESG note The document shepherd is Yana Stamcheva (yana@jitsi.org).
Send notices to psaintan@cisco.com, draft-saintandre-impp-call-info@tools.ietf.org, yana@jitsi.org
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

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   This Internet-Draft will expire on October 09, 2013.

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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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