I realize that Ooma currently does NOT offer call blocking. Well, I would think that a system as sophisticated as Ooma could handle what a $39 telephone can.
I am new to Ooma and so far I am very happy with it. I am awaiting my number to be ported over completely. Should be another two weeks I guess.
My number is already on the "do not call" list and for the most part I rarely receive unwanted calls (telemarketers, etc). I would think that in my online Ooma account somewhere there should simply be a place to add unwanted telephone numbers and Ooma would simply deny access to your line.
Since this is the suggestion area, I just thought I'd mention it.
A happy Ooma customer (so far).