They call. They didn't leave a message. A few minutes earlier I received a call from 1 615 465 3998 who does this often: leaves a message, but no content on the message other than the sound of them hanging up. When I answer the call, they hang up immediately. Related incidents, perhaps?
The message comes on..."the FBI says there is a break in every so many minutes...if you'll let us put a sign in your yard we'll install a security system free" blah blah blah