Dialogic 6.2 用户手册
BSMI Debugging
November 2009
106
The Message type value 0x05 identifies the D-channel message
as a SETUP; refer to
for possible Q.931
message type values.
Figure 7. Message Structures
Example
Byte
Bits
8
7
6
5
4
3
2
1
0
0
0
0
General Message
Bits
8
7
6
5
4
3
2
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
1
Example SETUP Message
1
2
3
-
08
01
01
05
Protocol Discriminator
Call ref length
Flag
Call reference value
Message type
0
Other Information Elements
(IEs) as required
Table 3. Q.931 Message Types
Message Type Bits
Hex
Message
0
0
0
0
0
0
0
1
01
Alerting
0
0
0
0
0
0
1
0
02
Call Proceeding
0
0
0
0
0
1
1
1
07
Connect
0
0
0
0
1
1
1
1
0F
Connect Acknowledge
0
0
0
0
0
0
1
1
03
Progress
0
0
0
0
0
1
0
1
05
Setup
0
0
0
0
1
1
0
1
0D
Setup Acknowledge
0
1
0
0
0
1
0
1
45
Disconnect
0
1
0
0
1
1
0
1
4D
Release
0
1
0
1
1
0
1
0
5A
Release Complete
0
1
0
0
0
1
1
0
46
Restart
0
1
0
0
1
1
1
0
4E
Restart Acknowledge