Real-Time Transport Protocol (RTP) is a protocol for the transmission of audio and video data, which is used in IP telephony and web-based video conferencing. RTP provides for the continuous transmission of multimedia data, whereas RTCP (Real-time Transport Control Protocol) transmits control messages between sender and receiver. SRTP (Secure Real-Time Transport Protocol) has the advantage of additional authentication and secure transmission. ZRTP is the key exchange protocol for VoIP end points to agree keys for encrypting voice or video streams using SRTP.
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