0

Unknown.

1

Unallocated (unassigned) number.

2

No route to specific transit network/(5ESS)Calling party off hold.

3

No route to destination / (5ESS) Calling party dropped while on hold.

4

Send special information tone / (NI-2) Vacant Code..

5

Misdialed trunk prefix.

6

Channel unacceptable.

7

Call awarded and being delivered.

8

Preemption/(NI-2)Prefix 0 dialed in error.

9

Preemption, cct reserved / (NI-2) Prefix 1 dialed in error.

10

(NI-2) Prefix 1 not dialed.

11

(NI-2) Excessive digits received call proceeding.

16

Normal call clearing.

17

User busy.

18

No user responding / No response from remote device.

19

No answer from user.

20

Subscriber absent (wireless networks).

21

Call rejected.

22

Number changed.

23

Redirection to new destination.

25

Exchange routing error.

26

Non-selected user clearing.

27

Destination Out Of Order.

28

Invalid number format.

29

Facility rejected.

30

Response to STATUS ENQUIRY.

31

Normal, unspecified.

34

No cct / channel available.

38

Network out of order.

39

Permanent frame mode connection out of service.

40

Permanent frame mode connection is operational.

41

Temporary failure.

42

Switching equipment congestion.

43

Access information discarded

44

Requested cct / channel not available

45

Pre-empted

46

Precedence blocked call

47

Resources unavailable/(5ESS)New destination

49

Quality of service unavailable

50

Requested facility not subscribed

52

Outgoing calls barred.

54

Incoming calls barred

57

Bearer capability not authorised.

58

Bearer capability not presently available.

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 bearer capability is available.

79

Service or option not implemented, unspecified.

81

Invalid call reference.

82

Identified channel does not exist.

83

A suspended call exists, but this id does not.

84

Call id in use.

85

No call suspended.

86

Call having the requested id has been cleared.

87

User not a member of Closed User Group.

88

Incompatible destination.

90

Non-existent Closed User Group.

91

Invalid transit network selection.

95

Invalid message, unspecified.

96

Mandatory information element missing.

97

Message type non-existent/not implemented.

98

Message not compatible with call state, non-existent or not implemented.

99

Information element non-existent or not implemented.

100

Invalid information element contents.

101

Message not compatible with call state / (NI-2) Protocol threshold exceeded.

102

Recovery on timer expiry.

IP Office Specific Cause Codes

103

Parameter not implemented.

110

Message with unrecognised parameter

111

Protocol error, unspecified

117

Parked (Internal system code).

118

UnParked (Internal system code).

119

Pickup (Internal system code).

120

Reminder (Internal system code).

121

Redirect (Internal system code).

122

Call Barred (Internal system code).

123

Forward To Voicemail (Internal system code).

124

Answered By Other (Internal system code).

125

No Account Code (Internal system code).

126

Transfer (Internal system code).

129

Held Call (Internal system code).*

130

Ring Back Check (Internal system code).*

131

Appearance Call Steal (Internal system code).*

132

Appearance Bridge Into (Internal system code).*

133

Bumped Call (Internal system code).*

134

Line Appearance Call (Internal system code).+

135

Unheld Call (Internal system code).+

136

Replace Current Call (Internal system code).+

137

Glare (Internal system code).+

138

R21 Compatible Conf Move (Internal system code).+

139

RingBack Answered (Internal system code).+

140

Transfer Request Failed (Internal system code).+

141

HuntGroup Drop (Internal system code).+