I don't answer phone calls from numbers I don't recognize. This number has called me 3 times, back to back. The first two times I missed the calls. They didn't leave a message. The third time I answered and no one said anything. I added them to my call reject list.
Same calls from that number. The best solution for unwanted calls is "no answer". If the phone call is important or a serious company, they will leave a message for you in the voice mail. If not, forget it.
That phone is a Magijack number. In my case, it was a phone call from a friend of mine located in Argentina. I was sorry to miss the phone calls as a email message was received later.