An Architectural Framework for Media Server Control
RFC 5567

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Network Working Group                                  T. Melanchuk, Ed.
Request for Comments: 5567                    Rain Willow Communications
Category: Informational                                        June 2009

          An Architectural Framework for Media Server Control

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

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Abstract

   This document describes an architectural framework for Media Server
   control.  The primary focus will be to define logical entities that
   exist within the context of Media Server control, and define the
   appropriate naming conventions and interactions between them.

Melanchuk                    Informational                      [Page 1]
RFC 5567                 Mediactrl Architecture                June 2009

Table of Contents

   1. Introduction ....................................................2
   2. Terminology .....................................................3
   3. Architecture Overview ...........................................4
   4. SIP Usage .......................................................7
   5. Media Control for IVR Services .................................10
      5.1. Basic IVR Services ........................................11
      5.2. IVR Services with Mid-Call Controls .......................11
      5.3. Advanced IVR Services .....................................11
   6. Media Control for Conferencing Services ........................12
      6.1. Creating a New Conference .................................14
      6.2. Adding a Participant to a Conference ......................14
      6.3. Media Controls ............................................15
      6.4. Floor Control .............................................16
   7. Security Considerations ........................................21
   8. Acknowledgments ................................................22
   9. Contributors ...................................................22
   10. Informative References ........................................23

1.  Introduction

   Application Servers host one or more instances of a communications
   application.  Media Servers provide real-time media processing
   functions.  This document presents the core architectural framework
   to allow Application Servers to control Media Servers.  An overview
   of the architecture describing the core logical entities and their
   interactions is presented in Section 3.  The requirements for Media
   Server control are defined in [RFC5167].

   The Session Initiation Protocol (SIP) [RFC3261] is used as the
   session establishment protocol within this architecture.  Application
   Servers use it both to terminate media streams on Media Servers and
   to create and manage control channels for Media Server control
   between themselves and Media Servers.  The detailed model for Media
   Server control together with a description of SIP usage is presented
   in Section 4.

   Several services are described using the framework defined in this
   document.  Use cases for Interactive Voice Response (IVR) services
   are described in Section 5, and conferencing use cases are described
   in Section 6.

Melanchuk                    Informational                      [Page 2]
RFC 5567                 Mediactrl Architecture                June 2009

2.  Terminology

   The following terms are defined for use in this document in the
   context of Media Server control:

   Application Server (AS):  A functional entity that hosts one or more
      instances of a communication application.  The application server
      may include the conference policy server, the focus, and the
      conference notification server, as defined in [RFC4353].  Also, it