Who called from 5035630168

I received a call form 503 563-0168 when I answered, there was not anyone there.  when I called back it says that it is the automated do not call registry. press one to enter your number to be added to the internal do not call registry.  I have no Idea who this is.

I received 3 calls from this number, missed them, called back and got a message that it was the do not call registry, and to dial 1 and enter my phone number, which I did not do.

Started receiving calls from this number, I never answer and they never leave a message. I am reporting this number to national do not call registry.

same - i don't answer, they don't leave a message

Received unsolicited call from this number on my cell.  Number was not known by me so I  didn't answer. Left no message.