The Real-Time Transport Protocol (RTP) Extensions specifies a set of proprietary extensions to the base Real-Time Transport Protocol (RTP). RTP is a set of network transport functions suitable for applications transmitting real-time data, such as audio and video, across multimedia endpoints. this protocol also provides bandwidth estimation, dominant speaker notification, video-packet loss recovery, and enhanced robustness for receivers.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also normative but do not contain those terms. All other sections and examples in this specification are informative.