ZyXEL Communications P-128IMH, User Manual, Page: 182 / 191

Prestige 128IMH ISDN Modem/ Router/Hub
15-2 Troubleshooting
15.2 Problems With the ISDN Line
Table 15-2 Troubleshooting the ISDN Line
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<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.
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.