Internet Engineering Task Force (IETF) M. Westerlund Request for Comments: 6336 Ericsson Updates: 5245 C. Perkins Category: Standards Track University of Glasgow ISSN: 2070-1721 July 2011
IANA Registry for Interactive Connectivity Establishment (ICE) Options
It has been identified that "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols" (RFC 5245) is missing a registry for ICE options. This document defines this missing IANA registry and updates RFC 5245.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
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"Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols" [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 [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 need to be registered with IANA to ensure non-conflicting identification. The ICE option identifiers are used in signalling between the ICE endpoints to negotiate extension support. RFC 5245 defines one method of signalling these ICE options, using the Session Description Protocol (SDP) with Offer/Answer [RFC3264].
This document updates the ICE specification [RFC5245] to define the "Interactive Connectivity Establishment (ICE) Options" registry.
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].
This document defines a registry "Interactive Connectivity Establishment (ICE) Options" for ICE options that can be used in the SDP "ice-options" attribute or other signalling parameters carrying the 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 options are of unlimited length according to 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 a 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