What is RTP ?
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RTP (Real Time Protocol) is a standard for audio/video transport in IP networks is the Real-time. RTP is mainly used along with SIP as a carrier of the media in VoIP and IMS networks.
RTP is an application layer protocol and uses UDP for transport over IP. It allows for the detection of some of the damage introduced by an IP network to the transported data as it includes timing recovery, loss detection and correction, reception quality feedback, media synchronization features
It is important to note that RTP itself does not provide Quality of Service (QoS); it only
provides QoS monitoring using the related RTP Control Protocol (RTCP).
RTP uses two random ports for communication one of which is odd and other is even, the even port is used for transfer of data while the odd port carries the control information. The control information is defined by the sister protocol RTCP
RTP is defined by IETF Proposed Standard RFC 3550
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