I have also received several calls from 817-785-70**. Every time I block one, they call again from a different extension. They never leave a message. I picked up once, but, I was somewhere noisy, so I couldn't tell if the caller said his name was Bob, or if he was looking for Bob. Either way, I told him he had dialed the wrong number and hung up. Of course, they called me again about an hour later.