RTP Control Protocol (RTCP) Extended Report (XR) Block for Independent Reporting of Burst/Gap Discard Metrics
RFC 8015

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Internet Engineering Task Force (IETF)                          V. Singh
Request for Comments: 8015                                  callstats.io
Category: Standards Track                                     C. Perkins
ISSN: 2070-1721                                    University of Glasgow
                                                                A. Clark
                                                                Telchemy
                                                                R. Huang
                                                                  Huawei
                                                           November 2016

         RTP Control Protocol (RTCP) Extended Report (XR) Block
         for Independent Reporting of Burst/Gap Discard Metrics

Abstract

   This document defines an RTP Control Protocol (RTCP) Extended Report
   (XR) block that allows the reporting of burst/gap discard metrics
   independently of the burst/gap loss metrics for use in a range of RTP
   applications.

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 7841.

   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/rfc8015.

Singh, et al.                Standards Track                    [Page 1]
RFC 8015                RTCP XR Burst/Gap Discard          November 2016

Copyright Notice

   Copyright (c) 2016 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
     1.1.  Independent Burst/Gap Discard Metrics Block . . . . . . .   3
     1.2.  RTCP and RTCP Extended Reports  . . . . . . . . . . . . .   4
     1.3.  Performance Metrics Framework . . . . . . . . . . . . . .   4
     1.4.  Applicability . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Independent Burst/Gap Discard Metrics Block . . . . . . . . .   5
     3.1.  Report Block Structure  . . . . . . . . . . . . . . . . .   6
     3.2.  Definition of Fields in the Independent Burst/Gap Discard
           Metrics Block . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Derived Metrics Based on the Reported Metrics . . . . . .   8
   4.  Considerations for Voice-over-IP Applications . . . . . . . .   9
   5.  SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  SDP rtcp-xr Attribute Extension . . . . . . . . . . . . .   9
     5.2.  Offer/Answer Usage  . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  New RTCP XR Block Type Value  . . . . . . . . . . . . . .  10
     6.2.  New RTCP XR SDP Parameter . . . . . . . . . . . . . . . .  10
     6.3.  Contact Information for Registrations . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Appendix A.  Metrics Represented Using the Template from RFC 6390  13
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

Singh, et al.                Standards Track                    [Page 2]
RFC 8015                RTCP XR Burst/Gap Discard          November 2016

1.  Introduction

1.1.  Independent Burst/Gap Discard Metrics Block

   This document defines a new block type that extends the metrics
   defined in [RFC7003].  The new block type reports the proportion of
   packets discarded in a burst by the de-jitter buffer at the receiver.
   The number of packets discarded depends on the de-jitter buffer
   algorithm implemented by the endpoint.