Who called from 4013792069

Rang twice hung up

Got the call today - Memorial Day - and when I answered it was Asterisk PBX saying "I'm sorry, that is not a valid extension." Guess these telemarketers couldn't even pay a decent phone vendor to set things up for them?

Got a call just a moment ago. It rang once and they hung up. No idea, but based on what other's are saying, it's probably spam!

Is it possible this an auto caller waiting to get a fax response? If a person anwsers maybe it just hangs up and calls the next number.

Had a missed call from this number with no message left. I won't answer if I don't recognize the number.