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10-10 Reference Guide
The Status item reports one of three results:
Untested: The loopback test has not yet been run.
Loopback Test FAILED: The loopback test has failed. See “If the
loopback test fails,” below, for troubleshooting suggestions.
Loopback Test PASSED. The loopback test was successful. The
line is working properly, and the directory numbers (the ISDN phone
numbers associated with each B-channel) are correct. If a SPID is
associated with the first B-channel, its correctness is also
confirmed. If a SPID is associated with the second B-channel, its
correctness is confirmed.
Note: SPIDs are applicable to certain North American ISDN switch
protocols.
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, SPIDs, 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).