Problems With The Isdn Line; Table 16-2 Troubleshooting The Isdn Line - ZyXEL Communications Prestige 128 Plus User Manual

Prestige 128+ ISDN Router

16.2 Problems With the ISDN Line

Table 16-2 Troubleshooting the ISDN Line

Problem
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'.
The ISDN loopback test failed.
16-2
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<n>...'. Note the code number, n.
If the code is 1, the ISDN link is not up. This problem could be
either the ISDN line is not properly connected to the Prestige or
the ISDN line is not activated. Verify that the ISDN line is
connected to the Prestige and to the wall telephone jack.
If the code is 3, this indicates a general failure. Verify the
provisioning information for your switch by contacting your
telephone company.
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.
Troubleshooting