What is RTP?

RTP (Real-Time Transport Protocol) is defined as a standardized packet format for delivering audio and video over IP networks. It is used extensively in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications, television services and web-based push-to-talk features. RTP is used in conjunction with the RTCP (RTP Control Protocol). While RTP carries the media streams (audio, video), RTCP is used to monitor transmission statistics and quality of service (QoS) and aids synchronization of multiple streams. RTP is originated and received on even port numbers and the associated RTCP communication uses the next higher odd port number.

RTP was developed by the Audio-Video Transport Working Group of the IETF (Internet Engineering Task Force) and first published in 1996 as RFC 1889. Later in 2003 it was superseded by RFC 3550.

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