Usage of D-Noise in the Dial Plan

We just installed approximately 30 Digium D40 phones on one of our plants. We have a few phones that are in noisy areas and when they make a page over our overhead paging system they pick up a ton of the background noise. Digium suggested using the D-Noise option in our dial plan, but I don’t believe I can do that within FreePBX. Can anyone confirm my thoughts on this?