RFC 8888, "RTP Control Protocol (RTCP) Feedback for Congestion Control", January 2021

Errata ID: 8535
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Harald Alvestrand
Date Reported: 2025-08-21

Section 6 says:

When the SDP BUNDLE extension [RFC8843] is used for multiplexing, the
"a=rtcp-fb:" attribute has multiplexing category IDENTICAL-PER-PT
[RFC8859].

It should say:

When the SDP BUNDLE extension [RFC8843] is used for multiplexing, the
"a=rtcp-fb:" attribute has multiplexing category IDENTICAL-PER-PT
[RFC8859].

When using BUNDLE, all media sections in the bundle MUST have the same
value for "a=rtcp-fb:*:ack ccfb" - it must either be present in all
sections or in none of the sections.

Notes:

Since 8888 is transport-wide, bundled audio and video must be consistent in CCFB. But IDENTICAL-PER-PT does not enforce this, since audio and video do not share payload types.

Report New Errata