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A-5
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
ETSI cause values
1 0 1
1 0 1
1 0 1
0 0 0 1
1 0 0 1
1 0 1 0
51
59
5A
Non existent closed user group
Called user not member of cug
Called user belongs to cug
Protocol error
1 1 0
1 1 0
1 1 0
1 1 0
1 1 0
1 1 0
1 1 0
1 1 0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
1 1 1 1
60
61
62
63
64
65
66
6F
Mandatory information element is
missing
Message type non existing or not
implemented
Message not compatible with call
state or message type non existent or
not implemented
Information element non existing or
not implemented
Invalid information element constants
Message not compatible with call state
Recovery on timer expiry
Protocol error, unspecified
Information element
identifier(s)
Message type
Message Type
Information element
identifier(s)
Information element
identifier(s)
Message type
Timer number
Interworking
1 1 1 1 1 1 1
5F Interworking, unspecified