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Versions: (draft-westerlund-mmusic-ice-options-registry) 00 01 02 RFC 6336

Network Working Group                                      M. Westerlund
Internet-Draft                                                  Ericsson
Updates: 5245 (if approved)                                   C. Perkins
Intended status: Standards Track                   University of Glasgow
Expires: November 13, 2011                                  May 12, 2011


 IANA Registry for Interactive Connectivity Establishment (ICE) Options
               draft-ietf-mmusic-ice-options-registry-02

Abstract

   It has been identified that Interactive Connectivity Establishment
   (ICE) RFC5245 is missing a registry for ICE options.  This document
   defines this missing IANA registry and updates RFC5245.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 13, 2011.

Copyright Notice

   Copyright (c) 2011 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
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   described in the Simplified BSD License.




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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . . . 3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  ICE Options . . . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 5







































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1.  Introduction

   "Interactive Connectivity Establishment (ICE): A Protocol for Network
   Address Translator (NAT) Traversal for Offer/Answer" [RFC5245]
   defines a concept of ICE Options.  However, the ICE RFC fails to
   create an IANA registry for ICE options.  As one ICE option is under
   specification in [I-D.ietf-avtcore-ecn-for-rtp], there is now a need
   to create the registry.

   RFC 5245 says: "ICE provides for extensibility by allowing an offer
   or answer to contain a series of tokens that identify the ICE
   extensions used by that agent.  If an agent supports an ICE
   extension, it MUST include the token defined for that extension in
   the ice-options attribute."

   Thus, as future extensions are defined, these ICE options needs to be
   registered with IANA to ensure non-conflicting identification.  The
   ICE options identifiers are used in signalling between the ICE
   endpoints to negotiate extension support.  RFC 5245 defines one
   method of signalling these ICE options, using SDP with Offer/Answer
   [RFC3264].

   This document updates the ICE specification [RFC5245] to define the
   "Interactive Connectivity Establishment (ICE) Options" registry.


2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].


3.  IANA Considerations

   This document defines a registry "Interactive Connectivity
   Establishment (ICE) Options" for ICE options that can be used in SDP
   "ice-options" attribute or other signalling parameters carrying the
   ICE options.

3.1.  ICE Options

   An ICE option identifier MUST fulfill the ABNF [RFC5234] syntax for
   "ice-option-tag" as specified in [RFC5245].  This syntax is
   reproduced here for simplicity, but the authoritative definition is
   in the ICE RFC:
   ice-option-tag        = 1*ice-char
   ice-char              = ALPHA / DIGIT / "+" / "/"



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   ICE options are of unlimited length by the syntax, however they are
   RECOMMENDED to be no longer than 20 characters.  This is to reduce
   message sizes and allow for efficient parsing.

   Registration of an ICE option in the "Interactive Connectivity
   Establishment (ICE) Options" registry is done using the Specification
   Required policy as defined in "Guidelines for Writing an IANA
   Considerations Section in RFCs" [RFC5226].

   A registration request MUST include the following information:

   o  The ICE option identifier to be registered

   o  Name, Email and Address of contact person for the registration

   o  Organization or individuals having the change control

   o  Short description of the ICE extension to which the option relates

   o  Reference(s) to the specification defining the ICE option and the
      related extensions

   This document registers no ICE option.


4.  Security Considerations

   As this document defines an IANA registry for an already existing
   concept there are no new security considerations.


5.  Acknowledgements

   The authors would like to thank the people having reviewed the draft
   and provided feedback, Flemming Andreasen, Mykyta Yevstifeyev, Amanda
   Baber and Brian Carpenter.


6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              May 2008.



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   [RFC5234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234, January 2008.

   [RFC5245]  Rosenberg, J., "Interactive Connectivity Establishment
              (ICE): A Protocol for Network Address Translator (NAT)
              Traversal for Offer/Answer Protocols", RFC 5245,
              April 2010.

6.2.  Informative References

   [I-D.ietf-avtcore-ecn-for-rtp]
              Westerlund, M., Johansson, I., Perkins, C., and K.
              Carlberg, "Explicit Congestion Notification (ECN) for RTP
              over UDP", draft-ietf-avtcore-ecn-for-rtp-01 (work in
              progress), March 2011.

   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
              with Session Description Protocol (SDP)", RFC 3264,
              June 2002.


Authors' Addresses

   Magnus Westerlund
   Ericsson
   Farogatan 6
   SE-164 80 Kista
   Sweden

   Phone: +46 10 714 82 87
   Email: magnus.westerlund@ericsson.com


   Colin Perkins
   University of Glasgow
   School of Computing Science
   Glasgow  G12 8QQ
   United Kingdom

   Email: csp@csperkins.org











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