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Internet Engineering Task Force (IETF)                        A.B. RoachRequest for Comments: 6878                                       MozillaUpdates:3261                                                 March 2013Category: Standards TrackISSN: 2070-1721IANA Registry for the Session Initiation Protocol (SIP)"Priority" Header FieldAbstract   This document defines a new IANA registry to keep track of the values   defined for the Session Initiation Protocol (SIP) "Priority" header   field.  It updatesRFC 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 inSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc6878.Copyright Notice   Copyright (c) 2013 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 78 and the IETF Trust's Legal   Provisions Relating to IETF Documents   (http://trustee.ietf.org/license-info) in effect on the date of   publication of this document.  Please review these documents   carefully, as they describe your rights and restrictions with respect   to this document.  Code Components extracted from this document must   include Simplified BSD License text as described in Section 4.e of   the Trust Legal Provisions and are provided without warranty as   described in the Simplified BSD License.Roach                        Standards Track                    [Page 1]

RFC 6878           SIP Priority Header Field Registry         March 20131.  Introduction   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.2.  IANA Considerations   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:                        +------------+-----------+                        | Priority   | Reference |                        +------------+-----------+                        | non-urgent |RFC 3261  |                        | normal     |RFC 3261  |                        | urgent     |RFC 3261  |                        | emergency  |RFC 3261  |                        +------------+-----------+   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.3.  Security Considerations   This document does not have any impact on the security of the SIP   protocol.  Its purpose is purely administrative in nature.Roach                        Standards Track                    [Page 2]

RFC 6878           SIP Priority Header Field Registry         March 20134.  References4.1.  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.   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an              IANA Considerations Section in RFCs",BCP 26,RFC 5226,              May 2008.4.2.  Informative References   [RFC4412]  Schulzrinne, H. and J. Polk, "Communications Resource              Priority for the Session Initiation Protocol (SIP)",RFC 4412, February 2006.Author's Address   Adam Roach   Mozilla   Dallas, TX   US   EMail: adam@nostrum.comRoach                        Standards Track                    [Page 3]