It's EMC Corporation out of Massechusetts. They sell information security systems - which I found out online because there is never anyone on the other end of the line. They call me like 10 times a day.
I had calls from (508) 435-1000 starting at 1:18am calling back continuously until 1:23am, this amounted in 4 calls. I had a block put on my phone against this number. I called the number back during regular business hours,and a receptionist answered. She couldn't tell me why someone from the company would call me at that time, but after reading the last message posted from March 2010, ten
calls a day is a little much.