RTP Control Protocol (RTCP) Extended Report (XR) Block for the Bytes Discarded Metric
RFC 7243

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Internet Engineering Task Force (IETF)                     V. Singh, Ed.
Request for Comments: 7243                                        J. Ott
Category: Standards Track                               Aalto University
ISSN: 2070-1721                                                I. Curcio
                                                   Nokia Research Center
                                                                May 2014

         RTP Control Protocol (RTCP) Extended Report (XR) Block
                     for the Bytes Discarded Metric

Abstract

   The RTP Control Protocol (RTCP) is used in conjunction with the Real-
   time Transport Protocol (RTP) to provide a variety of short-term and
   long-term reception statistics.  The available reporting may include
   aggregate information across longer periods of time as well as
   individual packet reporting.  This document specifies a report
   computing the bytes discarded from the de-jitter buffer after
   successful reception.

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/rfc7243.

Singh, et al.                Standards Track                    [Page 1]
RFC 7243                 RTCP XR Bytes Discarded                May 2014

Copyright Notice

   Copyright (c) 2014 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 ....................................................3
   2. Terminology .....................................................4
   3. Bytes Discarded Report Block ....................................4
   4. Protocol Operation ..............................................6
      4.1. Reporting Node (Receiver) ..................................6
      4.2. Media Sender ...............................................6
   5. SDP Signaling ...................................................7
   6. Security Considerations .........................................7
   7. IANA Considerations .............................................8
      7.1. XR Report Block Registration ...............................8
      7.2. SDP Parameter Registration .................................8
      7.3. Contact Information for IANA Registrations .................8
   8. Acknowledgments .................................................8
   9. References ......................................................9
      9.1. Normative References .......................................9
      9.2. Informative References .....................................9
   Appendix A. Metrics Represented Using the Template from RFC 6390 ..11

Singh, et al.                Standards Track                    [Page 2]
RFC 7243                 RTCP XR Bytes Discarded                May 2014

1.  Introduction

   RTP [RFC3550] provides a transport for real-time media flows such as
   audio and video together with the RTP Control Protocol (RTCP), which
   provides periodic feedback about the media streams received in a
   specific duration.  In addition, RTCP can be used for timely feedback
   about individual events to report (e.g., packet loss) [RFC4585].
   Both long-term and short-term feedback enable a media sender to adapt
   its media transmission and/or encoding dynamically to the observed
   path characteristics.

   [RFC3611] defines RTCP Extended Reports as a detailed reporting
   framework to provide more than just the coarse Receiver Report (RR)
   statistics.  The detailed reporting may enable a media sender to
   react more appropriately to the observed networking conditions as
   these can be characterized better, although at the expense of extra
   overhead.

   In addition to lost packets, [RFC3611] defines the notion of
   "discarded" packets: packets that were received but dropped from the
   de-jitter buffer because they were either too early (for buffering)
   or too late (for playout).  The "discard rate" metric is part of the