Who called from 4843810375

Call rec'd 11/15/16 - no message. Hadn't received a call from this number before so I didn't have it blocked. I do however have a few numbers with this area code blocked.

They called here yesterday at 9:00 AM and for her. I answered the phone and said she isn't here.Got what sounded like a fax machine. I have no clue as to who they are. They are located in Phila. PA

Let go to machine, no message left, do not answer unknown numbers

Woman with Asian accent said, "hello, hello" and then hung up. Calls at least 3x a week. Usually no person talks just hangs up.

No one answered on other end when I answered.