Protocols BroadNet answer

What is RTP (Real-time Transport Protocol)?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

RTP (Real-time Transport Protocol, RFC 3550) is the protocol that carries the actual audio and video media of a VoIP call over IP, usually over UDP. While SIP handles call setup, RTP streams the encoded voice packets with sequence numbers and timestamps so the receiver can reorder them and play them back in time. Its companion RTCP reports on jitter and packet loss; SRTP adds encryption. See /answers/what-is-sip, /answers/what-is-srtp, and /answers/voip-quality.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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