Caller ID shows NETPROWA...fax tone when answering. Have no clue who these people are. I've received calls from same area code before with caller ID showing NETPROCO. I have filed a complaint with Do Not Call registry as I've had my number on that list from the very beginning. This is my home number, not a fax number. I have call reject with phone company; unfortunately, I'm at the maximum 25 numbers that can be added so can't add this number.