started calling every thirty minutes today.  left no message but can hear many call-center operator voices  in the background.  they call again immediately after getting my voice mail trying to make phone ring continuously.  caller id says out of area.

from, 678-250-9920, receive two calls on two different VOiP phones only, two hours apart. they are rotating thru these assigned numbers investigating who is home at what hours of the day. marketing and metrics gathering of the populations where abouts during Monday work days. very interesting

I have received two calls from this number over the last 3 days. I have never answered it but today I called the number back. It rang about ten times so I hung up. It's now on my auto reject list.