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Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
The poloycom cannot be configured as a setting for this, it requires an external digital to analog adapter.
This is the recommended part: http://amzn.to/2dQaSh7
You can plug it in at the source (in your wiring closet) or on the poloycom end between the walljack and phone.
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The fix is to purchase the adapter I linked to above. That is the only way it will work.
Do you need more help with this?