Indicating Exclusive Support of RTP and RTP Control Protocol (RTCP) Multiplexing Using the Session Description Protocol (SDP)
RFC 8858
Yes
No Objection
Note: This ballot was opened for revision 09 and is now closed.
Alvaro Retana No Objection
(Alissa Cooper; former steering group member) Yes
(Ben Campbell; former steering group member) Yes
(Alexey Melnikov; former steering group member) No Objection
In Section 3:
The mux category [I-D.ietf-mmusic-sdp-mux-attributes] for the 'rtcp-
mux-only' attribute is 'IDENTICAL', which means that the attribute,
if used within a BUNDLE group
[I-D.ietf-mmusic-sdp-bundle-negotiation], must be associated with all
multiplexed RTP-based media descriptions within the BUNDLE group.
This sounds pretty normative, so I think the following 2 references should be Normative:
[I-D.ietf-mmusic-sdp-mux-attributes]
Nandakumar, S., "A Framework for SDP Attributes when
Multiplexing", draft-ietf-mmusic-sdp-mux-attributes-12
(work in progress), January 2016.
[I-D.ietf-mmusic-sdp-bundle-negotiation]
Holmberg, C., Alvestrand, H., and C. Jennings,
"Negotiating Media Multiplexing Using the Session
Description Protocol (SDP)", draft-ietf-mmusic-sdp-bundle-
negotiation-31 (work in progress), June 2016.
(Alia Atlas; former steering group member) No Objection
(Deborah Brungard; former steering group member) No Objection
(Jari Arkko; former steering group member) No Objection
(Joel Jaeggli; former steering group member) No Objection
Tim Wicinski <tjw.ietf@gmail.com> performed the opsdir review.
(Kathleen Moriarty; former steering group member) No Objection
(Mirja Kühlewind; former steering group member) No Objection
Quick question:
My initial understanding was that newer systems usually support RTP/RTCP multiplexing, while older systems that do not support RTP/RTCP multiplexing will also not be able to understand this new attribut. So I guess that's not the use case. That means the use case if for newer system that do know about RTP/RTCP multiplexing as well as the 'rtcp-mux-only' attribute but don't support it for some reason. What are these reasons? Maybe you can provide some more background about the intended usage here!
Minor:
Some sentences are a little hard to pharse as they are quite long, e.g.
OLD:
"When an offerer sends the initial offer, if the offerer wants to
indicate exclusive RTP/RTCP multiplexing for RTP-based media, the
offerer MUST associate an SDP 'rtcp-mux-only' attribute with the
associated SDP media description ("m=" line)."
MAYBE:
"If the offerer wants to
indicate exclusive RTP/RTCP multiplexing for RTP-based media, the
offerer MUST send the initial offer with an associated SDP 'rtcp-mux-only' attribute and the
associated SDP media description ("m=" line)."
(Spencer Dawkins; former steering group member) No Objection
(Stephen Farrell; former steering group member) No Objection
(Suresh Krishnan; former steering group member) No Objection
(Terry Manderson; former steering group member) No Objection