ISDN Disconnect cause codes

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.