I just got a call from this number. No message (I NEVER answer numbers I don't know). Being an old telephone system guy (not THAT old) I understand how this works... Something called an ISDN line can spoof caller ID numbers. The number sent isn't real but made to look real. That's why it's "out of service" when you call it back. I made a phone call to my sister once with her own caller ID! Anyway, who knows what the motive is. DON'T ANSWER!
Another BS number from WA state blowing up my cell phone, which is also on the do not call list. Why do we even waste time putting our number on the DNC list? Such a waste of time. Gotta love the diligence of the FCC!