Hình ảnh chuẩn H323.doc
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Session
Network
Data link
Physical
zone 1
zone 2
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
zone 1
zone 2
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
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
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?
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
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
