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.
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Clark, et al. Standards Track [Page 1]RFC 6843 RTCP XR Delay January 2013Table 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. Introduction1.1. 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
datatracker.ietf.org