ISDN Cause Codes

Cause
Code
Description
1Unallocated (unassigned) number
2No route to specified transit network
3No route to destination
6Channel Unacceptable
7Call awarded and being delivered in
an established channel
16Normal call clearing
17User busy
18No user responding
19No answer from user (user alerted)
21Call Rejected
22Number changed
26Non selected user clearing
27Destination out of order
28Invalid number format
29facility rejected
30Response to status enquiry
31Normal, unspecified
34No circuit/channel available
38Network out of order
41Temporary failure
42Switching equipment congestion
43Access information discarded
44Requested circuit/channel not available
47Resources unavailable, unspecified
49Quality of service unavailable
50Requested facility not subscribed
57Bearer capability not authorised
58Bearer capability not presently available
63Service or option not available, unspecified
65Bearer capability not implemented
66Channel type not implemented
69Requested facility not implemented
70Only restricted digital information
bearer capability is available
79Service or option not implemented, unspecified
81Invalid call reference value
82Identified channel does not exist
83A suspended call exists, but this call identity does not
84Call identity in use
85No call suspended
86Call having the requested call identity has been cleared
88Incompatible destination
91Invalid transit network selection
95Invalid message, unspecified
96Mandatory information element is missing
97Message type nonexistent or not implemented
98Message not compatible with call state or
message type nonexistent or not implemented
99Information element nonexistent or not implemented
100Invalid information element contents
101Message not compatible with call state
102Recovery on timer expiry
111Protocol error, unspecified
127Interworking, unspecified
128+Proprietary diagnostic code (not necessarily bad). Typically used to pass proprietary control or maintenance messages between multiplexers.
See Q.931 for more details.

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