The IESG has approved the Internet-Draft 'RTP Control Protocol
Extended Reports (RTCP XR)' <draft-ietf-avt-rtcp-report-extns-06.txt>
as a Proposed Standard. This document is the product of the
Audio/Video Transport Working Group.
The IESG contact persons are A. Mankin and J. Peterson
Technical Summary
This document defines the Extended Report (XR) packet type for the
RTP Control Protocol (RTCP), and defines how the use of XR packets
can be signaled by an application if it employs the Session
Description Protocol (SDP). XR packets are composed of report
blocks, and seven block types are defined here. The purpose of the
extended reporting format is to convey information that supplements
the six statistics that are contained in the report blocks used by
RTCP's Sender Report (SR) and Receiver Report (RR) packets. Some
applications, such as multicast inference of network characteristics
(MINC) or voice over IP (VoIP) monitoring, require other and more
detailed statistics. In addition to the block types defined here,
additional block types may be defined in the future by adhering to
the framework that this document provides. Security considerations
including the use of Secure RTCP to overcome the heightened amount of
information provided by the XR packet type are described.
Working Group Summary
The working group divided for a time on whether to include more complex
types of monitoring in the initial seven block types, but the resolution
on the framework achieved a very good consensus.
Protocol Quality
Prototype implementations exist of the XR packet type and have been
discussed in reviewing the specification.
The review of the specification was very active due to strong interest
by a variety of communities.
The review for the IESG was done by Allison Mankin.
