Before RLS23 you have to use the "Display" key feature to be able to see who is calling on a line other than the one you are on. If you have a spare key on the phone just program it as key xx dsp and that will take care of your problem.
Look at the first three letters after the CLS prompt when you print out both phones. These are an important part of this process. Post a follow up message and let us know what they are. You can find out about this in the Books under "Access Restrictions"
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