I just got a call from this number as well.  Did not answer, and did not "return call."  I've gotten many strange numbers like this lately, always unlisted.  I've tried "return call" a few times with no response. Always an unlisted number (a "business" with an unlisted number?), and in all cases I've sorted out, never a land line, as you'd typically associate a business as using. (And, remember, "pay as you go" cell phones are virtually disposable and anonymous.  An obvious boon for scammers.)  

I did happen to answer one, it was an obvious scam so I hung up.  (They had some personal information on me, stuff easily learned if you have my number in the first place- I suppose this was to gain my confidence, said I got a "stimulus voucher" or something like that, and suddenly "all we need is your bank card number to deposit..."  Click!)  

Only reason that I mention all this, it makes me wary of 206-397-1909.  So I would personally advise to avoid it.