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A User Agent Profile Data Set for Media Policy
RFC 6796

Internet Engineering Task Force (IETF)                           V. Hilt
Request for Comments: 6796                      Bell Labs/Alcatel-Lucent
Category: Standards Track                                   G. Camarillo
ISSN: 2070-1721                                                 Ericsson
                                                            J. Rosenberg
                                                             jdrosen.net
                                                               D. Worley
                                                                 Ariadne
                                                           December 2012

             A User Agent Profile Data Set for Media Policy

Abstract

   This specification defines an XML document format to describe the
   media properties of Session Initiation Protocol (SIP) sessions.
   Examples for media properties are the codecs or media types used in
   the session.  This document also defines an XML document format to
   describe policies that limit the media properties of SIP sessions.

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.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6796.

Hilt, et al.                 Standards Track                    [Page 1]
RFC 6796                  Media Policy Data Set            December 2012

Copyright Notice

   Copyright (c) 2012 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
   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.

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................5
   3. Media Policy Data Set Format ....................................5
      3.1. Namespace and Media Type ...................................5
      3.2. Extensibility ..............................................5
      3.3. Attributes .................................................6
           3.3.1. The 'visibility' Attribute ..........................6
           3.3.2. The 'direction' Attributes ..........................6
           3.3.3. The 'q' Attribute ...................................6
           3.3.4. The 'media-type' Attribute ..........................7
           3.3.5. The 'label' Attribute ...............................7
           3.3.6. The 'enabled' Attribute .............................7
   4. Session Info Documents ..........................................7
      4.1. Mapping between SDP and Session Info Documents .............8
      4.2. The <session-info> Element ................................10
      4.3. The <streams> Element .....................................10
           4.3.1. The <stream> Element ...............................10
      4.4. The <media-intermediaries> Element ........................11
           4.4.1. The <fixed-intermediary> Element ...................12
           4.4.2. The <turn-intermediary> Element ....................13
           4.4.3. The <msrp-intermediary> Element ....................13
   5. Session Policy Documents .......................................14
      5.1. Merging Session Policies ..................................14
           5.1.1. Single Value Selection .............................14
           5.1.2. Merging Sets .......................................15
           5.1.3. Local Policy Server Selection ......................16
      5.2. The <session-policy> Element ..............................16
      5.3. The <media-types-allowed> Element .........................16
      5.4. The <media-types-excluded> Element ........................17
      5.5. The <codecs-allowed> Element ..............................17
      5.6. The <codecs-excluded> Element .............................18

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