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Possible Cause 2: The standard phone’s message waiting light is not compatible with the
system.
What to do: See “Standard Telephones” in Chapter 1 for a list of supported standard
phones with message waiting lights and check with your local AT&T Authorized Dealer to
find out if there are others.
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If the phone is not supported, you can use it without message waiting capability.
If the phone is supported, go to Possible Cause 3.
Possible Cause 3: The standard phone is not connected to the proper hardware.
What to do: Make sure the phone is connected to an R3.1 206 module and the control unit
is equipped with an R3.1 processor module. If the problem is not solved, call the AT&T
Helpline.*
Problems with Combination Extensions
Phone Does Not Work Properly
Possible Cause 1: Ringer equivalents are too high for the extension.
What to do: Be sure the total of the two devices’ Ringer Equivalence Numbers (REN) does
not exceed 2.0. If it does, unplug one of the devices.
If the phone works properly, the problem is the REN was too high.
If the phone still does not work properly, go to Possible Cause 2.
Possible Cause 2: Auxiliary device (such as a fax, answering machine, or modem) is faulty.
What to do: Remove the auxiliary device from the extension and plug in an auxiliary
device that you know works properly.
If the phone works properly, the problem is the auxiliary device. Replace the
auxiliary device.
If the phone still does not work properly, go to Possible Cause 3.
Possible Cause 3: Phone is plugged into the wrong jack of the bridging adapter.
What to do: Plug the phone into the correct jack—see the PARTNER II Communications
System Installation guide for instructions. (If an MLS-18D phone is part of the combination,
make sure the second device is plugged directly into the MLS-18D phone.)
If the phone works properly, the problem is solved.
If the problem remains, go to Possible Cause 4.
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In the continental U.S., help is available at 1 800 628-2888. Outside the continental U.S., call your local
AT&T Authorized Dealer.
6-6 Troubleshooting