Internet Engineering Task Force (IETF) A. Clark
Request for Comments: 7266 Telchemy
Category: Standards Track Q. Wu
ISSN: 2070-1721 Huawei
R. Schott
Deutsche Telekom
G. Zorn
Network Zen
June 2014
RTP Control Protocol (RTCP) Extended Report (XR)
Blocks for Mean Opinion Score (MOS) Metric Reporting
Abstract
This document defines an RTP Control Protocol (RTCP) Extended Report
(XR) Block including two new segment types and associated Session
Description Protocol (SDP) parameters that allow the reporting of
mean opinion score (MOS) 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 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/rfc7266.
Clark, et al. Standards Track [Page 1]RFC 7266 RTCP XR MOS Report Blocks June 2014Copyright 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
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Table of Contents
1. Introduction ....................................................3
1.1. MOS Metrics Report Block ...................................3
1.2. RTCP and RTCP XR Reports ...................................3
1.3. Performance Metrics Framework ..............................3
1.4. Applicability ..............................................3
2. Terminology .....................................................4
2.1. Standards Language .........................................4
3. MOS Metrics Block ...............................................5
3.1. Report Block Structure .....................................6
3.2. Definition of Fields in MOS Metrics Block ..................6
3.2.1. Single-Channel Audio/Video per SSRC Segment .........7
3.2.2. Multi-Channel Audio per SSRC Segment ................9
4. SDP Signaling ..................................................10
4.1. SDP "rtcp-xr-attrib" Attribute Extension ..................10
4.2. Offer/Answer Usage ........................................12
5. IANA Considerations ............................................14
5.1. New RTCP XR Block Type Value ..............................14
5.2. New RTCP XR SDP Parameter .................................14
5.3. The SDP "calgextmap" Attribute ............................14
5.4. New Registry of Calculation Algorithms ....................15
6. Security Considerations ........................................16
7. Contributors ...................................................16
8. Acknowledgements ...............................................17
9. References .....................................................17
9.1. Normative References ......................................17
9.2. Informative References ....................................18
Appendix A. Metrics Represented Using the RFC 6390 Template .......20
Clark, et al. Standards Track [Page 2]RFC 7266 RTCP XR MOS Report Blocks June 20141. Introduction1.1. MOS Metrics Report Block
This document defines a new block type to augment those defined in
datatracker.ietf.org