Chapter 2. Quality of Service (QoS)
Voice and video over IP traffic consists of two parts: media/bearer traffic and signaling traffic. Media traffic is based on the Real-time Transport Protocol (RTP), which runs on top of the User Datagram Protocol (UDP). Signaling traffic is based on a number of protocols, such as Session Initiation Protocol (SIP), Skinny Call Control Protocol (SCCP), H.323 protocol, and Media Gateway Control Protocol (MGCP), all of which are TCP/UDP based. When an RTP packet is lost, re-creating or retransmitting it is neither possible nor worthwhile. As its name indicates, RTP works in real time, so any attempt to restore missing packets would not make sense because the packets would arrive out of order/sequence during a live ...
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