have been consistently blocking phone numbers from 503 area code.  Have not a clue to whom this number belongs too.  Doesn't  leave a message. No caller id available.  Just indicates unavailable.

I called this number back.  Nothing but dead air the first call.  On the second call I was put into the automated system for Seterus, Inc.  Seterus is the new name for IBM Lender Business Process Services.  Apparently they needed a new unknown number to go along with their name change.

Update:  After calling this number back and getting the automated system for Seterus, this number has repeatedly been calling me back.  I've received 4 calls from this number in the last 15 minutes.  I'm wondering if someone has a mock-up of Seterus' phone system and is phishing for your social security number, account information, or bank information.  Please use caution and only call Seterus' listed number and do not give any information whatsoever to this number.  It could be a valis number, but I have my doubts.  Better safe than sorry these days.

Yep, its definitely those yokels over at IBM Lender services. i set up a separate phone# Five months ago; but it wasnt until 2 weeks ago that i finally gave out the Number. I Only gave it to 1 Company: IBM Lender Services.
Now, surprise surprise, 'somebody' has started Calling... but NOT leaving a message. Ridiculous.
They can call All they want; its Not my Real Phone #.
They can also take back the house; the mortgage is now THREE times what the home is worth :D

Yep, this number calls a million times a day everyday and no message left.  How do they expect you to return the call if you don't know who it is or what they want.  It is getting very annoying and they clog my voice mail without saying anything.