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BSMI Debugging
November 2009 106
The Message type value 0x05 identifies the D-channel message
as a
SETUP; refer to Table 3 on page 106 for possible Q.931
message type values.
Figure 7. Message Structures
Exampl
e
Byte
Bits
8765 4321
0000
General Message
Bits
87654321
00001000
00000001
00000001
00000101
Example SETUP Message
See Figure 8
1
2
3
-
08
01
01
05
Protocol Discriminator
Call ref length
Flag Call reference value
Message type0
Other Information Elements
(IEs) as required
See Figure 8
Table 3. Q.931 Message Types
Message Type Bits Hex Message
0000000101 Alerting
0000001002 Call Proceeding
0000011107 Connect
000011110F Connect Acknowledge
0000001103 Progress
0000010105 Setup
000011010D Setup Acknowledge
0100010145 Disconnect
010011014D Release
010110105A Release Complete
0100011046 Restart
010011104E Restart Acknowledge