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2.1 Components
2.1.1 Terminal
2.1.2 Server
2.1.3 Gateway
2.1.4 Conference bridge
2.1.5 Addressing
2.2 Protocols
2.2.1 H.323
2.2.2 SIP
2.2.3 Media gateway control protocols
2.2.4 Proprietary signalling protocols
2.2.5 Real Time Protocol (RTP) and Real Time Control Protocol (RTCP) 3. IP TELEPHONY SCENARIOS