Hex
|
Decimal
|
Cause
|
0x1
|
1
|
Unallocated or unassigned number
|
0x2
|
2
|
No route to specified transit network (Transit Network Identity)
|
0x3
|
3
|
No route to destination
|
0x4
|
4
|
Send special information tone
|
0x5
|
5
|
Misdialled trunk prefix
|
0x6
|
6
|
Channel unacceptable
|
0x7
|
7
|
Call awarded and being delivered in an established channel
|
0x8
|
8
|
Prefix 0 dialed but not allowed
|
0x9
|
9
|
Prefix 1 dialed but not allowed
|
0xA
|
10
|
Prefix 1 not dialed but required
|
0xB
|
11
|
More digits received than allowed, call is proceeding
|
0x10
|
16
|
Normal call clearing
|
0x11
|
17
|
User busy
|
0x12
|
18
|
No user responding
|
0x13
|
19
|
T.301 expired: – User Alerted, No answer from user
|
0x15
|
21
|
Call rejected
|
0x16
|
22
|
Number changed to number in diagnostic field.
|
0x17
|
23
|
Reverse charging rejected
|
0x18
|
24
|
Call suspended
|
0x19
|
25
|
Call resumed
|
0x1A
|
26
|
Non-selected user clearing
|
0x1B
|
27
|
Destination out of order
|
0x1C
|
28
|
Invalid number format or incomplete address
|
0x1D
|
29
|
EKTS facility rejected by network
|
0x1E
|
30
|
Response to STATUS ENQUIRY
|
0x1F
|
31
|
Normal, unspecified
|
0x21
|
33
|
Circuit out of order
|
0x22
|
34
|
No circuit/channel available
|
0x23
|
35
|
Destination unattainable
|
0x24
|
36
|
Out of order
|
0x25
|
37
|
Degraded service
|
0x26
|
38
|
Network out of order
|
0x27
|
39
|
Transit delay range cannot be achieved
|
0x28
|
40
|
Throughput range cannot be achieved
|
0x29
|
41
|
Temporary failure
|
0x2A
|
42
|
Switching equipment congestion
|
0x2B
|
43
|
Access information discarded
|
0x2C
|
44
|
Requested circuit channel not available
|
0x2D
|
45
|
Preempted
|
0x2E
|
46
|
Precedence call blocked
|
0x2F
|
47
|
Resource unavailable, unspecified
|
0x31
|
49
|
Quality of service unavailable
|
0x32
|
50
|
Requested facility not subscribed
|
0x33
|
51
|
Reverse charging not allowed
|
0x34
|
52
|
Outgoing calls barred
|
0x35
|
53
|
Outgoing calls barred within CUG
|
0x36
|
54
|
Incoming calls barred
|
0x37
|
55
|
Incoming calls barred within CUG
|
0x38
|
56
|
Call waiting not subscribed
|
0x39
|
57
|
Bearer capability not authorized
|
0x3A
|
58
|
Bearer capability not presently available
|
0x3F
|
63
|
Service or option not available, unspecified
|
0x41
|
65
|
Bearer service not implemented
|
0x42
|
66
|
Channel type not implemented
|
0x43
|
67
|
Transit network selection not implemented
|
0x44
|
68
|
Message not implemented
|
0x45
|
69
|
Requested facility not implemented
|
0x46
|
70
|
Only restricted digital information bearer capability is available
|
0x4F
|
79
|
Service or option not implemented, unspecified
|
0x51
|
81
|
Invalid call reference value
|
0x52
|
82
|
Identified channel does not exist
|
0x53
|
83
|
A suspended call exists, but this call identity does not
|
0x54
|
84
|
Call identity in use
|
0x55
|
85
|
No call suspended
|
0x56
|
86
|
Call having the requested call identity has been cleared
|
0x57
|
87
|
Called user not member of CUG
|
0x58
|
88
|
Incompatible destination
|
0x59
|
89
|
Non-existent abbreviated address entry
|
0x5A
|
90
|
Destination address missing, and direct call not subscribed
|
0x5B
|
91
|
Invalid transit network selection (national use)
|
0x5C
|
92
|
Invalid facility parameter 93 Mandatory information element is missing
|
0x5D
|
93
|
Message type non-existent or not implemented
|
0x5F
|
95
|
Invalid message, unspecified
|
0x60
|
96
|
Mandatory information element is missing
|
0x61
|
97
|
Message type non-existent or not implemented
|
0x62
|
98
|
Message not compatible with call state or message type non-existent or not implemented
|
0x63
|
99
|
Information element nonexistent or not implemented
|
0x64
|
100
|
Invalid information element contents
|
0x65
|
101
|
Message not compatible with call state
|
0x66
|
102
|
Recovery on timer expiry
|
0x67
|
103
|
Parameter non-existent or not implemented – passed on
|
0x6F
|
111
|
Protocol error, unspecified
|
0x7F
|
127
|
Internetworking, unspecified
|
0x80+
|
128 or
higher
|
Proprietary diagnostic code (not necessarily bad). Typically used to pass proprietary control or maintenance messages between multiplexers.
|