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A-3
Q.931 Reason Code (00xx)
Cause Value
Cause ValueCause Value
Cause Value
Class
ClassClass
Class
bits
bitsbits
bits
7 6 5
7 6 57 6 5
7 6 5
Value
ValueValue
Value
bits
bitsbits
bits
4 3 2 1
4 3 2 14 3 2 1
4 3 2 1
Nbr
NbrNbr
Nbr
Cause
CauseCause
Cause
Diagnostic
DiagnosticDiagnostic
Diagnostic
Normal event
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 1 0
0 1 1 1
01
02
03
06
07
Unsigned number
No route to specified transit network
No route to destination
Channel unacceptable
Call awarded and being delivered in
an established channel
Transit network
identity
Normal event
0 0 1
0 0 1
0 0 1
0 0 1
00 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 1
0 1 1 0
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
10
11
12
13
15
16
1A
1B
1C
1D
1E
1F
Normal call clearing
User busy
No user responding
No answer from user (user alerted)
Call rejected
Number changed
Non-selected user clearing
Destination out of order
Invalid number format
Facility rejected
Response to STATUS ENQUIRY
Normal unspecified
User supplied
diagnostic
New destination
Facility
identification
Resource unavailable
0 1 0
0 1 0
0 1 0
0 1 0
0 1 0
0 1 0
0 1 0
0 0 1 0
0 1 1 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 1 1
22
26
29
2A
2B
2C
2F
No circuit/channel available
Network out of order
Temporary failure
Switching equipment congestion
Access information discarded
Requested circuit/chan not available
Resources unavailable, unspecified
Discarded IE
identifier(s)