Internet Engineering Task Force (IETF) A.B. Roach Request for Comments: 6878 Mozilla Updates: 3261 March 2013 Category: Standards Track ISSN: 2070-1721
IANA Registry for the Session Initiation Protocol (SIP) "Priority" Header Field
This document defines a new IANA registry to keep track of the values defined for the Session Initiation Protocol (SIP) "Priority" header field. It updates RFC 3261.
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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Roach Standards Track [Page 1]
RFC 6878 SIP Priority Header Field Registry March 2013
This document defines a new IANA registry to keep track of the values defined for the Session Initiation Protocol (SIP) "Priority" header field. This header field was defined in [RFC3261], Section 20.26. It was clearly specified in a way that allows for the creation of new values beyond those originally specified; however, no registry has been established for it.
This document adds a new sub-registry, "Priority Header Field Values", to the "Session Initiation Protocol (SIP) Parameters" registry page. Its format and initial values are as shown in the following table:
The policy for registration of values in this registry is "IETF Review" as that term is defined by [RFC5226]. This policy was chosen over lighter-weight policies due the potential architectural impact of the semantics associated with new values. Efforts contemplating adding a Priority value should consider whether the SIP Resource- Priority [RFC4412] or even a different protocol would be more appropriate for achieving their requirements.