Just posted a solution to someone else who had the same problem. I searched the web and found a call blocking device (about the size of a caller ID box) from a company called Digitone Communcations. You simply plug it into your wall phone jack and then plug your phone into the device. By default it blocks OPX calls, which are Anonymous, Out of Area, Private, Unknown, or "X" calls that do not have a minimum 7 digit number displayed. I just installed it over the weekend and it already blocked the "Out of Area 201" number so that it did not ring on any of my phones. It works with traditional phones and with digital phone service offered by cable companies. You need caller ID service for the device to work. It costs about $100.00 (not too bad a price to pay for privacy) and it has a lot of other features including After Hours Mode, that you can program into the device just by using your phone to enter some simple codes. Hope this helps.
Virtually every evening between 8:30 and 8:45, ID shows UNAVAILABLE and 201-535-3618. Unless I recognize name or a telephone number, I don't answer the call. Guess what, I get these calls on my cell...and they are mostly calls that ..."you've just won.........!
We continually get calls from this number and if we say hello once or twice, no one says anything. We have not hung up and put on mute and just listen. After a while, they put US on mute but don't hang up. What kind of business does this kind of sh**??
I don't usually pick these up but was annoyed that they even chose to call on Sunday. He identified himself as being from the ACLU and the call would be recorded. I said " I'm on the do not call list, it's Sunday and leave me alone." After hanging up I wish I had told him what I thought of the ACLU, that they care more about the rights of illegal immigrants than American citizens.