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RTP Control Protocol (RTCP) Extended Report (XR) Block for Delay Metric Reporting
RFC 6843

Internet Engineering Task Force (IETF)                          A. Clark
Request for Comments: 6843                                      Telchemy
Category: Standards Track                                       K. Gross
ISSN: 2070-1721                                             AVA Networks
                                                                   Q. Wu
                                                                  Huawei
                                                            January 2013

            RTP Control Protocol (RTCP) Extended Report (XR)
                    Block for Delay Metric Reporting

Abstract

   This document defines an RTP Control Protocol (RTCP) Extended Report
   (XR) block that allows the reporting of delay metrics for use in a
   range of Real-time Transport Protocol (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 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/rfc6843.

Copyright Notice

   Copyright (c) 2013 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.

Clark, et al.                Standards Track                    [Page 1]
RFC 6843                      RTCP XR Delay                 January 2013

Table of Contents

   1. Introduction ....................................................2
      1.1. Packet Delay Metrics Block .................................2
      1.2. RTCP and RTCP XR Reports ...................................2
      1.3. Performance Metrics Framework ..............................3
      1.4. Applicability ..............................................3
   2. Terminology .....................................................3
      2.1. Standards Language .........................................3
   3. Delay Block .....................................................3
      3.1. Report Block Structure .....................................4
      3.2. Definition of Fields in Delay Metrics Report Block .........4
   4. SDP Signaling ...................................................6
      4.1. SDP rtcp-xr-attrib Attribute Extension .....................7
      4.2. Offer/Answer Usage .........................................7
   5. IANA Considerations .............................................7
      5.1. New RTCP XR Block Type Value ...............................7
      5.2. New RTCP XR SDP Parameter ..................................7
      5.3. Contact Information for Registrations ......................7
   6. Security Considerations .........................................8
   7. Contributors ....................................................8
   8. Acknowledgments .................................................8
   9. References ......................................................8
      9.1. Normative References .......................................8
      9.2. Informative References .....................................9

1.  Introduction

1.1.  Packet Delay Metrics Block

   This document defines a new block type to augment those defined in
   [RFC3611] for use in a range of RTP applications.  The new block type
   supports the reporting of the mean, minimum, and maximum values of
   the network round-trip delay between RTP interfaces in peer RTP end
   systems as measured, for example, using the RTCP method described in
   [RFC3550].  It also supports reporting of the component of the round-
   trip delay internal to the local RTP system.

   The network metrics belong to the class of transport metrics defined
   in [RFC6792].

1.2.  RTCP and RTCP XR Reports

   The use of RTCP for reporting is defined in [RFC3550].  [RFC3611]
   defined an extensible structure for reporting using an RTCP Extended
   Report (XR).  This document defines a new Extended Report block for

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