30
Operating manual Pocket ISDN-TA
5
Diagnostic and error messages
For the diagnostic of erroneous situations the following functionality is supported.
Please check first the behaviour of LED displays, if an ISDN connection can not be
established. Refer to list of LED displays on page 34.
5.1
Error messages from AT command set
When the extended result messages are selected using the command ATV2 ISDN
error codes are displayed in addition to the standard AT result messages.
ISDN error causes from the ISDN network are always coded as
34xxH
, whereas the
last two digits
xx
represent the ISDN cause in hexadecimal coding. The meaning
can be taken from the following tables ISDN causes (see page 30).
5.2
Table of ISDN causes and their explanation (DSS1)
Cause
Decimal /
Hexadecimal
Meaning Translation
to AT result
codes
1 / 0x81
Unallocated (unassigned) number
3
2 / 0x82
No route to transit network
3
3 / 0x83
No route to destination
3
6 / 0x86
Channel unacceptable
6
7 / 0x87
Call awarded and being delivered in an
established channel
6
16 / 0x90
Normal clearing
3
17 / 0x91
User busy
7
18 / 0x92
No user responding
8
19 / 0x93
No answer from user (user alerted)
8
20 / 0x94
No answer from user (device off)
8
21 / 0x95
Call rejected
8
22 / 0x96
Number changed
3
26 / 0x9A
Non selected user clearing
3
27 / 0x9B
Destination out of order
8
28 / 0x9C
invalid number format
3
29 / 0x9D
Facility rejected
3
30 / 0x9E
Response to STATUS ENQUIRY
3
31 / 0x9F
Normal disconnect, unspecified
3
34 / 0xA2
No circuit/channel available
7
38 / 0xA6
ISDN network out of order
6
41 / 0xA9
Temporarily failure
6
43 / 0xAB
Access information discarded
6
44 / 0xAC
Requested circuit/channel not available
6
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