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This topicprovides a list of failed call causes. Refer to the ANSI T1.607-1990 standard for additional details.

 

Cause Table

Number

Cause

1

Unallocated (unassigned) number

2

No Route to specified transit network

3

No Route to destination

4

Vacant Area Code or Central Office Code

6

Channel unacceptable

7

Call awarded and being delivered in an established channel

8

Prefix 0 dialed but not allowed

9

Prefix 1 dialed but not allowed

10

Prefix 1 not dialed but required

11

More digits received than allowed, call is proceeding

16

Normal call clearing

17

User busy

18

No user responding

19

No answer from user (user alerted)

21

Call rejected

22

Number changed

26

Non-selected user clearing

27

Destination out of order

28

Invalid number format

29

Facility rejected

30

Response to STATUS INQUIRY

31

Normal, unspecified

34

No circuit or channel available

38

Network out of order

41

Temporary failure

42

Switching equipment congestion

43

Access information discarded

44

Requested circuit or channel not available

45

Preemption

46

Precedence call blocked

47

Resource unavailable, unspecified

49

Quality of service unavailable

50

Requested facility not subscribed

57

Bearer capability not authorized

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 information bearer capability is available

79

Service or option not implemented, unspecified

81

Invalid call reference value

82

Identified channel does not exist

88

Incompatible destination

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 non-existent or not implemented

100

Invalid information element content

101

Message not compatible with call state

102

Recovery on timer expiry

111

Protocol error, unspecified

127

Interworking, unspecified