Interactive real-time media applications that use the Real-time Transport Protocol (RTP) over the User Datagram Protocol (UDP) must use congestion control techniques above the UDP layer since it provides none. This memo describes the interactions and interfaces necessary between the application components that relate to congestion control, including the RTP layer, the higher-level media codec control layer, and the lower-level transport interface and the congestion control layer.
The document has RFC2119 keywords, but mostly in small case. Should we keep the RFC2119? or update the document with appropriate uppercase and lowercase keywords?