This number called my office phone and didn't leave a message.

This number has called my office phone twice without leaving a message.

Got another call from this number at my office phone. They did not leave a message.

Got two calls from this number on my cell phone yesterday, 11/4/2015, and one call this morning. No messages left. I tried calling the number back at approximately 10:45 AM EST, and I got an "all circuits are busy" message. I reset my cell phone, tried the number again, and I got the same message. I'm marking this as a telemarketer at this point.

I have had several calls from this number about once or twice a week.  I never answered and they never left a message. I called back from my cell phone and also got an "all circuits busy" message. Blocking this number.