IP: Addresses and Forwarding

1
?????
????????????? ???
2
???? ???????
3
1?H.323??????

• H.323????????
• 1996????H.323?????????(LAN)??????????(QoS)
  ?????????H.323???????????????????????H.323????H.26
  1?H.263?????????,??G.711, G.722,
  G.728,G.729?G.723.1??????????,????????(gateways)??
  ????(gatekeeper)???????(MCU)???????
• H.323?????????????(Internet
  telephony)???

4
1?H.323??????

• H.323?????????

5
1?H.323??????

• H.323?????????
• H.323??
• H.323???????????????,????????????H.323???,
  ????????????????(H.263/H.261)??????(G.71X/G.72X/G.
  723.1)?T120??????(real time data
  conferencing)?MCU????????H.323??????????????,?????
  ???????????H.323?????????????????????????????

6
1?H.323??????

• H.323?????????
• H.323??

7
1?H.323??????

• H.323?????????
• H.323??

H.323???,????????????????????PSTN??????ISDN
????H.320??????????PSTN??H.324??????????????????H.
245?Q.931?H.323???????????H.323???????????????????
???????H.323?????????????????????,???????????????
8
1?H.323??????

• H.323?????????
• H.323??

9
1?H.323??????

• H.323?????????
• H.323???
• ????H.323?????,?????????????????,?????????
  ????????????????????????????????,??????????LAN????
  ?IP???????????????,???????????????????????????,??
  ???????????????????,?????????,????????????????????
  ??????????????????????????(MCU)??????H.323??(H.323
  Zone)?
• ?H.323???,???????????????????,????????????
  ????????????????????????????????

10
1?H.323??????

• H.323?????????
• H.323??????
• ??????(MCU)???3???3????????????????H.323??
  ???,??MCU????????MC (Multipoint Controller)?
  ??????MP (Multipoint Processors)???MC??H.245??????
  ????????????????,????????????????????????????MC???
  ????,????????????????????,????????????MP??????????
  ?????????????????MC?MP?????????????????H.323???

11
1?H.323??????

• H.323???????
• ???????
• ????????(centralized multipoint
  conference)?,????MCU???????,??????????????MCU?????
  ????????????MCU??MC??????H.245?????????,?MP???????
  ???????????/??,??????????????????MP???????,???????
  ????????????????,??????????????????????

12
1?H.323??????

• H.323???????
• ???????
• ????????(decentralized multipoint
  conference)?,??????????????????MCU????????????????
  ??????????????????????????????????????,???????????
  MCU????,H.245????(H.245 Control
  Channel)??????????????MC?

13
1?H.323??????

• H.323???????
• ?????????
• ?????????????(hybrid multipoint
  conference)????????????????????(hybrid
  multipoint conference - centralized
  audio)????????????????(hybrid multipoint
  conference - centralized video)????????,??????????
  ??????????????,?????????????????????(MCU)???????(M
  P),???MP???????????

14
1?H.323??????

• H.323???????
• ?????????
• ???????,????????????????????????,?????????
  ??????????????(MCU)???????(MP)???????,???MP???????
  ???????
• ???????????????????????????

15
1?H.323??????

• H.323???????
• ?????????????
• ?????????????(mixed multipoint
  conferences)?????????????????????????????????

16
2?H.324????

• H.324??
• H.324????????????????????????????????????
  ???????????
• H.324??????????????????,???????????H.263
  ????????,???????20 kb/s?G.723.1??????,???????5.3
  kb/s(??????)??6.3 kb/s?H.223 ?????????????????H.
  245???????????????T120????????(???????)?

17
2?H.324????

• H.324??
• H.324??28.8 kb/s????????????????????,??PC
  ??????????????????????????????????????????????,H.3
  24?????????????????????????????,??????????????????
  ?????????????????????????????????28.8
  kb/s????,??????????????6 kb/s,??????????????????

18
2?H.324????

• H.324??

19
2?H.324????

• H.324??
• ????????H.263??H.261???????????????
• ????????G.723.1?????????????????,???????,????????
  ??????,?????????????????????????????,???????????
  ?

20
2?H.324????

• H.324??
• ??????????????????(electronic
  whiteboards)????????????????????(audio graphics
  conferencing)?????????????????????????T.120(??????
  ???????????)?T.80(????????????????)?T.434(????????
  ????)?H.224/H.281(?????????)?ISO/IEC
  TR9577????(??PPP?IP??)???????V.14??LAPM/V.42??????
  ??LAPM/V.42????????????????(Link Access Protocol
  for Modems)????????????????????H.245???

21
2?H.324????

• H.324??
• ????(H.245)??H.324??????????H.245????????
  ??,???????????????????????????????????????????????
  ?????????????????
• ????/????(H.223)?????????????????????????
  ???????????????????????????????????????,????????(
  logical framing)?????????????????????

22
2?H.324????

• H.324??
• ??????????H.324???????,???H.324??????????
• ????/???????????????????????????
• ????/??????????????????????
• ??????(????)??????????????????????????????
  ?????
• PSTN????????????????????????????????
• ??????????????????