IBM WaveRunner Manual page 27

If you are connected to a passive bus to which other ISDN devices are also
connected, make sure that each device has a unique TEI. IF two devices
request the same TEI, both TEI's will be removed. If there is a conflict,
change one of the device's TEI values. (This problem is applicable to only
fixed value TEI lines).
Verify that you chose the correct switch type in the WaveRunner Adapter
ISDN configuration. Review the information you received from the Phone
Company when you requested ISDN service to make sure that you have
configured the switch type.
No response from application driver (Modem, V.120, V.120/Modem,
Async-to-Sync) when running communications application.
Description: Indicates a conflict in COM port addresses or interrupt
assignments.
User Response: Make sure that all appropriate application drivers have
been loaded onto your WaveRunner Adapter. If all drivers have been
loaded and you still get no response from your communications
application, verify that the COM port addresses and interrupt assignments
specified in your communications application match the COM port
addresses and interrupt assignments configured for the WaveRunner
Adapter.
B channel Active indicator in the ISDN Port Monitor window does
not come on when attempting to place or receive a call.
Description: Indicates that the D channel is active but that the network
cannot complete a call to the remote device. You will often receive a fast
busy tone if this condition exists. This is usually caused by an ISDN
configuration error.
User Response: Open the ISDN Port Monitor window and watch the
window while making a call. If neither of the B Channel Active indicators
comes on, check the status window for any messages. Check the online
help to view detailed information about any messages you see.
Verify that the following conditions are met:
• The phone number you have configured matches the phone
number you received when you requested ISDN service.
• Your ISDN line is not configured for EKTS.
• Refer to the section, Telephone Company Checklist for ISDN
Operation, in this manual for ISDN configuration information.
• The grade of service you have configured is correct.
• If the grade of service you have for your ISDN phone line is CSD,
there could be errors when making calls with the modem
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