IBM SC30-3681-08 manual Isdn Q.931 Cause Codes, Code Cause

Using ISDN

1.If cause0 is not ²0x5² ignore the cause code.

2.If cause0 is ²0x5² look at cause1. If the high-order (most signi®cant) bit of cause1 is ON, set it to OFF.

3.Convert the result to decimal and look up the meaning in the following table, which is taken from ITU-T Recommendation Q.850.

Table 79. ISDN Q.931 Cause Codes

Code	Cause
1	Unallocated (unassigned number)
2	No route to speci®ed transit network
3	No route to destination
6	Channel unacceptable
7	Call awarded and is being delivered in an established channel
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 (address incomplete)
29	Facility rejected
30	Response to STATUS ENQUIRY
31	Normal, unspeci®ed
34	No circuit/channel available
38	Network out of order
41	Temporary Failure
42	Switching equipment congestion
43	Access information discarded
44	Requested circuit/channel not available
47	Resource unavailable, unspeci®ed
49	Quality of Service not available
50	Requested facility not subscribed
57	Bearer capability not authorized
58	Bearer capability not presently available
63	Service or option not available, unspeci®ed
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, unspeci®ed
81	Invalid call reference value

Chapter 45. Using the ISDN Interface 615