I checked the Reverse Phone directory which says that the number belongs to Mcimetro, Ats, Inc. in Herndon, VA. Hope this helps.
You are a miracle worker. I used a reverse phone directory on the web and it came up empty. Which one did you use?
You got it! When I called Perot Systems they said they used MCI as their carrier. MCI must use those numbers to do commercial faxing!
The good news is I think the faxes have stopped. Got the last one around 4 today. I'm hoping they don't start up again tomorrow morning!