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13-14 User’s Reference Guide
If the loopback test fails
Follow these suggestions to track down the reason behind the loopback test’s failure:
■ Check that the WAN Ready LED is solid green.
■ Check the ISDN event log and get more information about events that seem relevant to the failure.
■ Check the B-channel usage in the Quick View screen to make sure there were no active calls when the
loopback test was performed.
■ Check the accuracy of the directory numbers and switch protocol you entered in the ISDN Line
Configuration screen (compare them with the information you received from your ISDN service provider).
■ Verify termination of the S/T bus.
■ Contact your ISDN service provider to have the line checked.
■ Check that your line is not provisioned for voice only (Circuit Switched Voice).