0

No cause specified

1

Unallocated (unassigned) number

2

No route to specified transit network

3

No route to destination

4

Send special information tone

5

Misdialled trunk prefix

6

Channel unacceptable

7

Call awarded and being delivered in an established channel

8

Preemption

9

Preemption – circuit reserved for reuse

14

QoR: ported number

16

Normal call clearing

17

User busy

18

No user responding

19

No answer from user (user alerted)

20

Subscriber absent

21

Call rejected

22

Number changed

23

Redirection to new destination

24

Call rejected due to feature at the destination

25

Exchange routing error

26

Non-selected user clearing

27

Destination out of order

28

Invalid number format (address incomplete)

29

Facility rejected

30

Response to STATUS ENQUIRY

31

Normal, unspecified

34

No circuit/channel available

38

Network out of order

39

Permanent frame mode connection out of service

40

Permanent frame mode connection operational

41

Temporary failure

42

Switching equipment congestion

43

Access information discarded

44

Requested circuit/channel not available

46

Precedence call blocked

47

Resource unavailable, unspecified

49

Quality of service not available

50

Requested facility not subscribed  

53

Outgoing calls barred within CUG

55

Incoming calls barred within CUG

57

Bearer capability not authorized

58

Bearer capability not presently available

62

Inconsistency in designated outgoing access information and subscriber class

63

Service or option not available, unspecified

65

Bearer capability not implemented

66

Channel type not implemented

69

Requested facility not implemented

70

Only restricted digital information bearer capability is available

79

Service or option not implemented, unspecified

81

Invalid call reference value

82

Identified channel does not exist

83

A suspended call exists, but this call identity does not

84

Call identity in use

85

No call suspended

86

Call having the requested call identity has been cleared

87

User not member of CUG

88

Incompatible destination

90

Non-existent CUG

91

Invalid transit network selection

95

Invalid message, unspecified

96

Mandatory information element is missing

97

Message type non-existent or not implemented

98

Message not compatible with call state or message type non-existent or not implemented

99

Information element /parameter non- existent or not implemented

100

Invalid information element contents

101

Message not compatible with call state

102

Recovery on timer expiry

103

Parameter non-existent or not implemented, passed on

110

Message with unrecognized parameter, discarded

111

Protocol error, unspecified

127

Interworking, unspecified