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Networking Fundamentals · Intermediate

Real-time Transport Protocol (RTP)

A protocol that carries real-time audio and video over UDP, with sequence numbers and timestamps for playback timing.

Definition

RTP ports are negotiated dynamically, commonly within UDP 16384-32767 on Cisco systems. RTCP provides quality statistics, and SRTP provides encryption.

Example

During a VoIP call, voice packets are carried in RTP over UDP.

Exam tip

Voice media = RTP over UDP; signaling = SIP.

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