ZyXEL Communications 480 manual Problems With the Isdn Lines, Troubleshooting the Isdn Lines

Prestige 480 Dual BRI ISDN Router

16.2 Problems With the ISDN Lines

Table 16-2 Troubleshooting the ISDN Lines

Problem	Corrective Action
The ISDN initialization failed.	Check the error log (in Menu 24.3.1), you should see a log entry for the
This problem occurs when you	ISDN initialization failure in the format, ‘ISDN init failed. code<n>...’.
attempt to save the	Note the code number, n.
parameters entered in Menu	If the code is 1, the ISDN link is not up. This problem could be either the
2, but receive the message,
	ISDN lines are not properly connected to the Prestige or the ISDN lines
‘Save successful, but Failed to
	are not activated. Verify that the ISDN lines are connected to the
initialize ISDN; Press ESC to
	Prestige and to the wall telephone jack.
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.

Troubleshooting 16-3