Chapter 4. MEDIA: RTP SECURITY

Real-time Transport Protocol (RTP) is the major multimedia transport method for SIP and H.323. Real Time Control Protocol (RTCP) is often used with RTP as the complementary protocol that sends nondata information, such as control information, to endpoints. RTCP is primarily used for QoS (Quality of Service) information, such as packets sent, packets received, and jitter. (Jitter is the variation in the delay of received packets in a VoIP packet flow.) Both protocols are often used together for the media layer of VoIP networks (mostly RTP with some supporting RTCP packets). While VoIP calls are set up using H.323 or SIP, the voice communication (audio) between two endpoints will use RTP. Figure 4-1 shows an example ...

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