Media Resource Brokering
RFC 6917

Internet Engineering Task Force (IETF)                        C. Boulton
Request for Comments: 6917                               NS-Technologies
Category: Standards Track                                     L. Miniero
ISSN: 2070-1721                                                 Meetecho
                                                               G. Munson
                                                                    AT&T
                                                              April 2013

                        Media Resource Brokering

Abstract

   The MediaCtrl working group in the IETF has proposed an architecture
   for controlling media services.  The Session Initiation Protocol
   (SIP) is used as the signaling protocol that provides many inherent
   capabilities for message routing.  In addition to such signaling
   properties, a need exists for intelligent, application-level media
   service selection based on non-static signaling properties.  This is
   especially true when considered in conjunction with deployment
   architectures that include 1:M and M:N combinations of Application
   Servers and Media Servers.  This document introduces a Media Resource
   Broker (MRB) entity, which manages the availability of Media Servers
   and the media resource demands of Application Servers.  The document
   includes potential deployment options for an MRB and appropriate
   interfaces to Application Servers and Media Servers.

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/rfc6917.

Boulton, et al.              Standards Track                    [Page 1]
RFC 6917                Media Resource Brokering              April 2013

Copyright Notice

   Copyright (c) 2013 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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions and Terminology .....................................6
   3. Problem Discussion ..............................................6
   4. Deployment Scenario Options .....................................7
      4.1. Query MRB ..................................................8
           4.1.1. Hybrid Query MRB ....................................9
      4.2. In-Line MRB ...............................................11
   5. MRB Interface Definitions ......................................12
      5.1. Media Server Resource Publish Interface ...................12
           5.1.1. Control Package Definition .........................13
           5.1.2. Element Definitions ................................15
           5.1.3. <mrbrequest> .......................................15
           5.1.4. <mrbresponse> ......................................17
           5.1.5. <mrbnotification> ..................................19
      5.2. Media Service Resource Consumer Interface .................30
           5.2.1. Query Mode/HTTP Consumer Interface Usage ...........31
           5.2.2. In-Line Aware Mode/SIP Consumer Interface Usage ....32
           5.2.3. Consumer Interface Lease Mechanism .................35
           5.2.4. <mrbconsumer> ......................................38
           5.2.5. Media Service Resource Request .....................39
           5.2.6. Media Service Resource Response ....................51
      5.3. In-Line Unaware MRB Interface .............................54
   6. MRB Acting as a B2BUA ..........................................54
   7. Multimodal MRB Implementations .................................55
   8. Relative Merits of Query Mode, IAMM, and IUMM ..................56
   9. Examples .......................................................58
      9.1. Publish Example ...........................................58