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VoIP gateway IP400 version 5.01
Appendix C: ISDN error codes
The following table specifies the error codes (
ISDN cause codes
) defined in the
Q.931 standard.
Error
code
(hex)
Error code,
bit 8 set to
1 (hex)
Error
code
(deci-
mal)
Description
0x1
0x81
1
Unallocated number
0x2
0x82
2
No route to specified transit network
0x3
0x83
3
No route to destination
0x6
0x86
6
Channel unacceptable
0x7
0x87
7
Call awarded and being delivered in
an established channel
0x10
0x90
16
Normal call clearing
0x11
0x91
17
User busy
0x12
0x92
18
No user responding
0x13
0x93
19
No answer from user (user alerted)
0x15
0x95
21
Call rejected
0x16
0x96
22
Number changed
0x1A
0x9A
26
Non-selected user clearing
0x1B
0x9B
27
Destination out of order
0x1C
0x9C
28
Invalid number format
0x1D
0x9D
29
Facility rejected
0x1E
0x9E
30
Response to STATUS ENQUIRY
0x1F
0x9F
31
Normal, unspecified