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Kiến trúc tại Terminal H.323 của Cisco
Session Network Data link Physical H2:H.323 Protocols in relation to the OSI model G.711 G.722 G.728 G.729 G.723.1.1 Presentation H.261 H.263 T.127 T.126 T.124 T.125/T.1222 RICP RAS RIP H.450.1 H.450.3 H.450.2 X.244.0 H.245 H.225 H.235 UDB TCP Audio signal Application Video signal Data signal Transport supplementary Services Control H×nh 3: kiÕn tróc t¹i Terminal H.323 cña Cisco Video Conference Architecture a typical H.323 Terminal Video I/O Equipment Audio I/O Equipment User Data Applications System Control User Interface H.225.0 Layer Locall Area Network Intererface recovery Path Delay Video codec H261, H263 Audio condec G711, G722, G723, G728 G729 System control H245 control Call control H226.0 RAS Control zone 1 zone 2 yes you can! H×nh4: Admission - Cisco Admission Control With Cisco IOS MCM Gatekeeper – Call Across WAN IP WAN Admission Control Via Zone BandWidth in the Cisco IOS MCM Gatepeer May I call 2111 with a bandwidth of 384K? Call flow H.323 RAS signaling h×nh 6:Trao ®æi th«ng ®iÖp Q.931 Vµ H.245 gi÷a hai H.323 Terminal 1. Setup 2. Alerting 3. Connect 4. TermCapSet 5. TermCapAck 6. mSDet 7. mSDetAck 8. mSDetConfirm 9. openReq 10. openAck 11. endSession 12.ReleaseComplet Q.931 messages H.245 messages 1 4 A 5 6 8 9 10 11 12 2 3 5 4 B 7 10 9 11