IANA Registry for the Session Initiation Protocol (SIP) "Priority" Header Field

Internet Engineering Task Force (IETF)                        A.B. Roach
Request for Comments: 6878                                       Mozilla
Updates: <a href="./rfc3261">3261</a>                                                 March 2013
Category: Standards Track
ISSN: 2070-1721


        <span class="h1">IANA Registry for the Session Initiation Protocol (SIP)</span>
                        <span class="h1">"Priority" Header Field</span>

Abstract

   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 <a href="./rfc3261">RFC 3261</a>.

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 <a href="./rfc5741#section-2">Section 2 of RFC 5741</a>.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   <a href="https://www.rfc-editor.org/info/rfc6878">http://www.rfc-editor.org/info/rfc6878</a>.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a> and the IETF Trust's Legal
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   (<a href="http://trustee.ietf.org/license-info">http://trustee.ietf.org/license-info</a>) 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.







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<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>.  Introduction</span>

   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 <a href="./rfc3261#section-20.26">[RFC3261], Section 20.26</a>.
   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.

<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>.  IANA Considerations</span>

   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 | <a href="./rfc3261">RFC 3261</a>  |
                        | normal     | <a href="./rfc3261">RFC 3261</a>  |
                        | urgent     | <a href="./rfc3261">RFC 3261</a>  |
                        | emergency  | <a href="./rfc3261">RFC 3261</a>  |
                        +------------+-----------+

   The policy for registration of values in this registry is "IETF
   Review" as that term is defined by [<a href="./rfc5226" title="">RFC5226</a>].  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 [<a href="./rfc4412" title=""Communications Resource Priority for the Session Initiation Protocol (SIP)"">RFC4412</a>] or even a different protocol would be more
   appropriate for achieving their requirements.

<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>.  Security Considerations</span>

   This document does not have any impact on the security of the SIP
   protocol.  Its purpose is purely administrative in nature.














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<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>.  References</span>

<span class="h3"><a class="selflink" id="section-4.1" href="#section-4.1">4.1</a>.  Normative References</span>

   [<a id="ref-RFC3261">RFC3261</a>]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", <a href="./rfc3261">RFC 3261</a>,
              June 2002.

   [<a id="ref-RFC5226">RFC5226</a>]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", <a href="https://www.rfc-editor.org/bcp/bcp26">BCP 26</a>, <a href="./rfc5226">RFC 5226</a>,
              May 2008.

<span class="h3"><a class="selflink" id="section-4.2" href="#section-4.2">4.2</a>.  Informative References</span>

   [<a id="ref-RFC4412">RFC4412</a>]  Schulzrinne, H. and J. Polk, "Communications Resource
              Priority for the Session Initiation Protocol (SIP)",
              <a href="./rfc4412">RFC 4412</a>, February 2006.

Author's Address

   Adam Roach
   Mozilla
   Dallas, TX
   US

   EMail: [email protected]
























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