IBM -4900 - Manual (Page 43)

Intercom, line status, auto-answer, privacy or auto-line selection are inoperable.
Check if Lines and 2 are cross wired in the wall jack.
If used, see if you may have installed your 2-line adapter incorrectly.
Be sure all extensions in the system are connected to [LINE I].
Check the assigned extension codes, making sure they are unique.
Be sure the length of cable between stations does not exceed 300 feet.
Check that all phone lines are correctly connected to each station (every [LINE I] is connected to
the appropriate line, every [LINE is connected to the appropriate line, and so on.)
Remove all RFI filters from the system wiring. You may also need to contact your local telephone
company to have any RFI filter removed from the company side of the connection.
No dial tone/phone will not dial out.
Check that you have plugged the AC power adapter into a working AC power outlet.
Confirm that the AC power adapter is plugged into the DC jack locates at the unit.
Check all telephone cord connections.
Try another wall jack.
Make sure the line connection is programmed ON.
Can’t hear the ring signal.
Check the ringer volume controls. At lowest level the ring may not be heard.
Check the status of DND (Do Not Disturb). Make sure the LED is not lit.
Can’t hear the ring signal on one line only.
the ringer setting on that line.
Programming Ringer On/Off.
While on a call do you hear another call on the line or are you experiencing radio frequency
interference?
Make sure all wiring is twisted pair, including modular cords on non-system devices.
Check the wiring for bad connections.
Reaching the wrong number in speed dialing.
Check that you are accessing the correct dial group (see speed dialing).
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