With the fact that the world's largest H.323 network is experienced, and through the revision of the practice to the theory, it is decided to share these and share the exchange with everyone. The small title is consistent with the chapter of the agreement.
1 Scope
The H.323 protocol defines the overall framework of the "Packet-Based MultiMedia Communications Systems). This system can be built on a packet switching network without QoS (QUALITY OF Service). These include:
-Local Area NetWorks, LAN
-Enterprise Area Networks, Enterprise Network
-Metropolitan area NetWorks, Metropolitan
-Intra-networks,?
-Inter-networks (Including the Internet), internet
- Packet transmission GSTN or dial-up connection or point-to-point connection on ISDN
(You should give an example here)
The H.323 system entity described by the H.323 protocol includes:
-Terminals, the terminal (such as Netmeeting is a soft terminal)
-Gateways, gw, gateway (such as ordinary telephone network to H.323 network gateway)
-Gatekeepers, GK, gatekeerage (with endpoint management, call control, address resolution)
-Multipoint Controllers, MC, multi-point controller
-Multipoint processors, MP, multi-point processor
-Multipoint Control Units, MCU, Multi-Point Control Unit (including MC and MP)
The last three multi-point Dongdong is a multi-point meeting to participate in multiple terminals. The use of various entities and system frames that make up together will be seen.
Endpoint: H.323 Terminal, GW, MCU, these three Dongdong should register on GK.
(There should be a picture here, but you can't post it, see
H.323 protocol
Figure 1 / h.323 - interoperability of h.323 terminals)
2 NormalATIVE REFERENCES
It is necessary to pay attention to and frequently:
-H.225: Call signaling protocol and media stream packaging protocol (which contains RAS and Q.931)
-H.245: Media channel control protocol
- Audio Agreement: g Beap
- Video Agreement: H.261, H.263
-E.164: Identify the encoding rule of the terminal (like a phone number)
-H.450: Call Transfer, Call Diversion, Call Park, Call Waiting, etc. (this is also similar to traditional phone) Related functions)
-T.120: H.323 system data protocol (such as transfer files) (other later)
3 Definitions
You can see the terminology that you don't understand later.
4 Symbols and abbreviations abbreviation
You can see the terminology that you don't understand later.
5 convention
"Shall": mandatory requirements
"Should": Suggest, but optional
"May": Optional but not suggestions
"1.4": Refer to the H.323 protocol 1.4
"6.4 / h.245": Refer to the H.245 protocol 6.4
"Network": PBN
"MCU": h.323mcu
"SCN-MCU": MCU on the SCN? Who gave an example of SCN-MCU, I have never seen it.
Three different messages:
-H.245: Maximumdelayjitter
-RAS: ARQ
-Q.931: Call Proceeding
