Who called from 2012000427

No idea who it is.  Calls and leaves no message.

I too got this unwanted call today from 201-200-0427 and I have no idea who or what this number is from. I wish this would just stop

Weird caller, male voice, asked for a Doctor Yao, said no one by this name is here, and then I asked who is calling, and the person just hung up.  I tried calling back the number, and either is a 3 tone beep and then an all circuits are busy, or this number is not available.

Called this morning.  Left no message.