This company calls my business several times a week. I only answer when I am hurrying to get the next call after hanging up with another one and not having time to check caller id. They never make a sound on the other end. I play the waiting game and they always hang up first.
I can only guess that they are checking that my phone is live and then sell my number to a telemarketer because within a hour or two I receive another call from out of state that I do not answer either.
I'm only licensed in my state so I can choose not to answer out of state calls.