Subject: [AVTCORE] [Errata Verified] RFC3611 (3795)

From: RFC Errata System <[email-masked]>
Date: Wed, 22 Jul 2015 07:13:37 -0700 (PDT)

The following errata report has been verified for RFC3611,
"RTP Control Protocol Extended Reports (RTCP XR)". 

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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=3611&eid=3795

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Status: Verified
Type: Technical

Reported by: Stephen James <[email-masked]>
Date Reported: 2013-11-11
Verified by: Ben Campbell (IESG)

Section: 5.1

Original Text
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rtcp-xr-attrib = "a=" "rtcp-xr" ":" [xr-format *(SP xr-format)] CRLF

Corrected Text
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rtcp-xr-attrib = "a=" "rtcp-xr" [ ":" xr-format *(SP xr-format)] CRLF

Notes
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The ABNF for the attribute is causing some interoperability issues.
The text as written shows that the colon is required while the parameters are optional.
This leaves the format: "a=rtcp-xr:" the required format.  Vendors are using "a=rtcp-xr" which strictly violates the ABNF above. Moving the ':' into the optional part seems correct.

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RFC3611 (draft-ietf-avt-rtcp-report-extns-06)
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Title               : RTP Control Protocol Extended Reports (RTCP XR)
Publication Date    : November 2003
Author(s)           : T. Friedman, Ed., R. Caceres, Ed., A. Clark, Ed.
Category            : PROPOSED STANDARD
Source              : Audio/Video Transport
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG