Who called from 6036371806

This was the Calling number at my business. When I answered no one said anything, and no background noise.They hung up after 5 seconds or so. I called the number back from my caller ID and got a recording that I had reached a non working number. Maybe a robo call?

Called, left no message.

called from New Hampshire, did not leave a message

called my phone, no message. i called back, "press 9 to be placed on a Do Not Call list."

Called. Left no message.