Media Gateway Control Protocol (MGCP) Voiceband Data (VBD) Package and General-Purpose Media Descriptor Parameter Package
RFC 6498

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Internet Engineering Task Force (IETF)                          J. Stone
Request for Comments: 6498                                      R. Kumar
Category: Informational                                     F. Andreasen
ISSN: 2070-1721                                            Cisco Systems
                                                           February 2012

 Media Gateway Control Protocol (MGCP) Voiceband Data (VBD) Package and
           General-Purpose Media Descriptor Parameter Package

Abstract

   This document defines Media Gateway Control Protocol (MGCP) packages
   that enable a Call Agent to authorize and monitor the transition of a
   connection to and from Voiceband Data (VBD) with or without
   redundancy and FEC (forward error correction).  Although the focus is
   on VBD, the General-Purpose Media Descriptor Parameter package can be
   used to authorize other modes of operation, not relevant to VBD, for
   a particular codec.  In addition to defining these new packages, this
   document describes the use of the Media Format Parameter package and
   Fax package with VBD, redundancy, and FEC.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6498.

Stone, et al.                 Informational                     [Page 1]
RFC 6498                    MGCP VBD Package               February 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
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Stone, et al.                 Informational                     [Page 2]
RFC 6498                    MGCP VBD Package               February 2012

Table of Contents

   1. Applicability Statement .........................................3
   2. Introduction ....................................................3
   3. Terminology .....................................................5
   4. Voiceband Data Package Definition ...............................5
      4.1. Events and Signals .........................................5
           4.1.1. Gateway Controlled Voiceband Data ...................6
           4.1.2. No Negotiated Procedure for Voiceband Data .........13
   5. General-Purpose Media Descriptor Parameter Package Definition ..16
      5.1. LocalConnectionOptions ....................................16
           5.1.1. General-Purpose Media Descriptor Parameter .........17
   6. Use of Media Format Parameter Package with VBD and Redundancy ..20
   7. Use of Media Format Parameter Package with VBD and FEC .........22
   8. Use of Fax Package with VBD ....................................23
   9. Call Flow Examples .............................................27
      9.1. Modem Call with Gateway Controlled VBD ....................27
      9.2. Fax Call with Gateway Controlled VBD and Call
           Agent Controlled T.38 .....................................33
   10. Security Considerations .......................................42
   11. IANA Considerations ...........................................44
   12. Acknowledgements ..............................................44