This appears to be a broken, automated dialing machine, instead of delivering a message, it is silent, and hangs up after a few seconds. It has called me 7 times in 4 days! I had to have the number blocked by my phone provider.
This number is a credit card processing company, whom I'm assuming got my number when I registered my business. It's a prerecorded number, and I've been receiving at least 1-2 calls a day from them. I'm beyond annoyed, and have now filed a complaint against them with the FCC. I suggest you do the same, if they're doing this to you.
I have received 6 calls from this number in the past 3 days, but missed the call each time. I called the number back and there is an automated option to be place on their DNC list by pressing 1. It said it may take 72 hours to take effect. Hopefully that works, we'll see...