ZyXEL Communications 480 - Manual (Page 144)

Prestige 480 ISDN Router
12-2 Troubleshooting
12.2 Problems With the ISDN Lines
Table 12-2 Troubleshooting the ISDN Lines
Problem
Corrective Action
Check the error log (in Menu 24.3.1), you should see a log entry for the
ISDN initialization failure in the format, ‘ISDN init failed. code...’.
Note the code number, n.
If the code is 1, the ISDN link is not up. This problem could be either the
ISDN lines are not properly connected to the Prestige or the ISDN lines
are not activated. Verify that the ISDN lines are connected to the
Prestige and to the wall telephone jack.
The ISDN initialization failed.
This problem occurs when you
attempt to save the
parameters entered in Menu
2, but receive the message,
‘Save successful, but Failed to
initialize ISDN; Press ESC to
exit’.
If the code is 3, this indicates a general failure. Verify the provisioning
information for your switch by contacting your telephone company.
The ISDN loopback test failed. If the ISDN initialization is successful, then the loopback test should
also work. Verify the telephone numbers that have been entered in
Menu 2. The loopback test dials the number entered in the 2nd Phone
# field (except for switch types with only one phone number). If you
need to dial a prefix (e.g., ‘9’) to get an outside line, then you have to
enter the telephone number as ‘95551212’ or ‘914085551212’. If it is an
internal line, you may only need to enter the last four or five digits
(according to your internal dialing plan), e.g., 51212.