Spam calls to our business. They never leave a message. After listening to the phone calls in (they are all recorded), these are all folks with the same type of accent. They all come up as Greater Pittsburgh Int'l Airport WA.

Update: Woman with an accent, claiming to be from FedEx, wanted to confirm the VP Marketing's mailing address.  I researched the tracking number she gave me, and when I told her there was no such thing, she hung up.  Usually, these callers either disappear the moment I ask for the tracking number or refuse to divulge it, in which case, I hang up on them.

Man with heavy accent; he greeting me after I answered with my company name.  Then they disconnected.

Just received a call from this number.  The caller had a heavy accent and asked for an employee that did not exist.  When I said there was no one here by that name, he said thank you and hung up.  This number is now on the radar.  

Someone from this number called my house at 4:43 am!!  The caller ID just shows Bellevue, WA.  We are on the DO NOT CALL list, so how are they allowed to call??