Megaco IP Phone Media Gateway Application Profile
RFC 3054

Document Type RFC - Informational (January 2001; No errata)
Last updated 2013-03-02
Replaces draft-blatherwick-megaco-ipphone
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Network Working Group                            P. Blatherwick (Editor)
Request for Comments: 3054                               Nortel Networks
Category: Informational                                         R. Bell
                                                           Cisco Systems
                                                              P. Holland
                                                    Circa Communications
                                                   (Chair TIA TR-41.3.4)
                                                            January 2001

           Megaco IP Phone Media Gateway Application Profile

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.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.


   This document specifies a particular application of the Megaco/H.248
   Protocol for control of Internet telephones and similar appliances:
   the Megaco IP Phone Media Gateway.  The telephone itself is a Media
   Gateway (MG), controlled by the Megaco/H.248 Protocol, with
   application control intelligence located in the Media Gateway
   Controller (MGC).  To achieve a high degree of interoperability and
   design efficiency in such end-user devices, a consistent
   architectural approach, a particular organization of Terminations and
   Packages, and a Protocol Profile are described.  The approach makes
   use of existing Protocol features and user interface related
   Packages, and is thus a straight-forward application of the
   Megaco/H.248 Protocol.

1.  Introduction

   This document represents the current view from the TIA working group
   on VoIP (Voice over IP) telephone specification [1], TIA TR-41.3.4,
   with the intent of using this as part of its "whole device"
   specification as an optional method of device control.

   Industry feedback has made it clear that interoperability and
   acoustic performance of Internet telephones is key to the rapid and
   extensive commercialization of these products.  To facilitate this,
   the TIA has established working group TR-41.3.4 to develop a standard

Blatherwick, et al.          Informational                      [Page 1]
RFC 3054      Megaco IP Phone Media GW Application Profile  January 2001

   for VoIP telephones.  The TR-41.3.4 working group has included the
   "whole device" within the scope of the standard, so a full range of
   requirements including acoustic performance, protocols, methods for
   powering and safety are provided.  Where possible, the requirements
   are based on existing standards, which are included by reference.

   The TIA TR-41.3.4 working group has also recognized that its proposed
   standard must enable creative application of the equipment, encourage
   the development of new capabilities and allow for high levels of
   product customization.  To achieve this, peer to peer architectures
   that are based on protocols such as H.323 or SIP and master/slave
   architectures such as Megaco/H.248 Protocol are both necessary and

   In support of the Megaco/H.248 Protocol development effort, the TR-
   41.3.4 working group has considered product enabling issues and
   requirements, and has developed an approach to use the Megaco/H.248
   Protocol for Internet telephone device control.  This document
   represents the working group's current view.

   This document covers the general requirements of the Megaco IP Phone
   application (section 3), architectural approach and MG organization
   (section 4), details of specific Termination types used and Packages
   supported by each (section 5), and the Megaco IP Phone Protocol
   Profile (section 6).

2.  Conventions

   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
   document, are to be interpreted as described in RFC 2119 [5].

3.  General Requirements

   The following general requirements were identified to drive the
   Megaco IP Phone design [1]:

   1. The Megaco IP Phone must meet the basic needs of the business user
      from day one;

   2. Provide a path for rapid expansion to support sophisticated
      business telephony features;

   3. Flexibility to allow for a very wide range of telephones and
      similar devices to be defined, from very simple to very feature

   4. Simple, minimal design;

Blatherwick, et al.          Informational                      [Page 2]
RFC 3054      Megaco IP Phone Media GW Application Profile  January 2001

   5. Allow device cost to be appropriate to capabilities provided;

   6. Packages and Termination types must have characteristics that
      enable reliability;

   7. The IP Phone MG shall meet the appropriate Megaco/H.248 Protocol
      requirements as provided in the Megaco Requirements document [2]
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