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.
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service as this is the only way I am credited for my time. Hopefully I have earned 5 Stars but if not please let me know what I can do to ensure you are satisfied. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
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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?