Received a call and they hung up.  It's a VoIP telephone number.  I called back and woman who answered, refused to tell me what company they were and what they did (too secretive).  She kept stating that my telephone number was not one that they had in their "system" that was called.  I asked her why they call people and hang up, she stated "we do a lot of things here".  Sure they do!  Total spammer!