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ISDN Cause Codes


This appendix includes the following topics:
Checking the status windows
List of cause codes
1TR6 ISDN cause codes

Checking the status windows

ISDN cause codes help you diagnose problems with calls. They appear in the System Events status window:

Refer to the User's Guide for administrative information about displaying ISDN line status in the Terminal server.

List of cause codes

The cause codes listed on this table are not valid for German 1TR6 networks. Refer to 1TR6 ISDN cause codes for German 1TR6 cause codes.


Note: Cause code implementations can be different depending on how your switch is configured. Consult your ISDN service provider if you have any questions about the cause codes supported for your switch type.

Table 5-1. ISDN cause codes

Code

Cause

0

Valid cause code not yet received

1

Unallocated (unassigned) number.

2

No route to specified transit network (WAN).

3

No route to destination

4

send special information tone

5

misdialed trunk prefix

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 dialed but not required

11

More digits received than allowed, call is proceeding

16

Normal clearing.

17

User busy.

18

No user responding.

19

No answer from user (user alerted)

21

Call rejected.

22

Number changed.

23

Reverse charging rejected

24

Call suspended

25

Call resumed

26

Non-selected user clearing

27

Destination out of order

28

Invalid number format (incomplete number).

29

Facility rejected.

30

Response to STATUS ENQUIRY.

31

Normal, unspecified.

33

Circuit out of order

34

No circuit/channel available.

35

Destination unattainable

37

Degraded service

38

Network (WAN) out of order.

39

Transit delay range cannot be achieved

40

Throughput range cannot be achieved

41

Temporary failure.

42

Switching equipment congested.

43

Access information discarded.

44

Requested circuit channel not available.

45

Pre-emptied.

46

Precedence call blocked

47

Resource unavailable, unspecified

49

Quality of service unavailable

50

Requested facility not subscribed.

51

Reverse charging not allowed

52

Outgoing calls barred.

53

Outgoing calls barred within CUG

54

Incoming calls barred.

55

Incoming calls barred within CUG

56

Call waiting not subscribed

57

Bearer capability not authorized

58

Bearer capability not presently available.

63

Service or option not available, unspecified.

65

Bearer service not implemented.

66

Channel type not implemented.

67

Transit network selection not implemented

68

Message 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

Called user not member of CUG

88

Incompatible destination.

89

Non-existent abbreviated address entry

90

Destination address missing, and direct call not subscribed

91

Invalid transit network selection (national use)

92

Invalid facility parameter

93

Mandatory information element is missing

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 nonexistent or not implemented

100

Invalid information element contents.

101

Message not compatible with call state

102

Recovery on timer expired.

103

Parameter non-existent or not implemented, passed on

111

Protocol error, unspecified

127

Internetworking, unspecified.


1TR6 ISDN cause codes

All products that support BRI can optionally support 1TR6 switch types. The ISDN cause codes for 1TR6 are different from AT&T, NI-1, NTI switch types and other switch types. Table 5-2 lists the ISDN cause codes for 1TR6 switch types.

Table 5-2. 1TR6 ISDN cause codes

Code

Cause

Explanation

1

Invalid call reference value

Invalid CR value

3

Bearer service not implemented

Service not available in the A-exchange or at another position in the network, or no application has been made for the specified service.

7

Call identity does not exist

Unknown call identity

8

Call identity in use

Call identity has already been assigned to a suspended link.

10

No channel available

No useful channel available on the subscriber access line (only local significance).

16

Requested facility not implemented

The specified FAC code is unknown in the A-exchange or at another point in the network.

17

Request facility no subscribed

Request facility rejected because the initiating or remote user does not have appropriate authorization.

32

Outgoing calls barred

Outgoing call not possible due to access restriction which has been installed.

33

User access busy

If the total made up of the number of free B-channels and the number of calling procedures without any defined B-channel is equal to four, then any new incoming calls will be cleared down from within the network. The calling party receives a DISC with cause "user access busy" (= 1st busy instance) and engaged tone.

34

Negative CUG comparison

Link not possible due to negative CUG comparison.

35

Non existent CUG

This CUG does not exist.

37

Communication as semi-permanent link not permitted

Link not possible, e.g. because RFNR check is negative.

48 - 50

Not used

53

Destination not obtainable

Link cannot be established in the network due to incorrect destination address, services or facilities

56

Number changed

Number of B-subscriber has changed.

57

Out of order

Remote TE not ready

58

No user responding

No TE has responded to the incoming SETUP or call has been interrupted, absence assumed (expiry of call timeout T3AA).

59

User busy

B-subscriber busy

61

Incoming calls barred

B-subscriber has installed restricted access against incoming link or the service which has been requested is not supported by the B-subscriber

62

Call rejected

To A-subscriber: Link request actively rejected by B-subscriber (by sending a DISC in response to an incoming SETUP.)

To a TE during the phase in which an incoming call is being established: The call has already been accepted by another TE on the bus.

89

Network congestion

Bottleneck situation in the network; e.g. all-trunks-busy, no conference set free

90

Remote user initiated

Rejected or cleared down by remote user or exchange.

112

Local procedure error

In REL: Call cleared due to local errors (invalid messages or parameters, expiry of timeout, etc.)

In SUS REJ: The link must not be suspended because another facility is already active.

In RES REJ: No suspended call available.

In FAC REJ: No further facility can be requested because one facility is already being processed, or the specified facility may not be requested in the present call status.

113

Remote procedure error

Call cleared down due to error at remote end.

114

Remote user suspended

The call has been placed on hold or suspended at the remote end.

115

Remote user resumed

Call at remote end is no longer on hold, suspended or in the conference status.

127

User Info discarded locally

The USER INFO message is rejected locally. This cause is specified in the CON message.



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