Skip to main content

Liaison statement

Additional information about IETF liaison relationships is available on the IETF webpage and the Internet Architecture Board liaison webpage.
State Posted
Submitted Date 2016-03-02
From Group xrblock
From Contact Shida Schubert
To Group W3C
To Contacts Wendy Seltzer <>
Philippe Le H├ęgaret <>
Cc Barry Leiba <>
Dan Romascanu <>
Ben Campbell <>
Alissa Cooper <>
mnot <>
Metric Blocks for use with RTCP's Extended Report Framework Discussion List <>
Shida Schubert <>
Response Contact Dan Romascanu <>
Shida Schubert <>
Purpose For information
Attachments (None)
Dear WebRTC WG,

The XRBLOCK WG in IETF has been working on a draft recommending the type of
RTCP XR blocks that would be beneficial for webrtc endpoint, in order to
identify any issues regarding media stream(s) and act on to provide better
overall user-experience to the end-user. The draft defines a IANA registry with
a list of identifiers for the WebRTC's statistics API with a set of RTCP SR,
RR, and XR metrics related to the transport of multimedia flows.

Gist from the introduction of the draft:
"The WebRTC Stats API currently lists metrics reported in the RTCP Sender and
Receiver Report (SR/RR) [RFC3550] to fulfill this requirement. However, the
basic metrics from RTCP SR/RR are not sufficient for precise quality
monitoring, or diagnosing potential issues.

In this document, we provide some guidelines on choosing additional RTP metrics
for the WebRTC [W3C.WD-webrtc-20150210]. Furthermore, we create a registry
containing metrics reported in RTCP XR."

Any comments from the W3C WebRTC WG participants are welcome, they can be
provided directly to the WG by sending your comments to

S. Schubert
Co-chair, XRBLOCK Workgroup