Not really sure, but maybe add a contact on your phone as UNKNOWN...and see if that works? Or you could use a call forwarding service (Free if you get free Call forward) like Youmail. Not quite sure if that will do what you want either, but I know that you can have a unique voicemail waiting for the person that called you with a blocked number. Such as making it sound like the number that they just dialed is out of service, etc...
Maybe with this info you can come up with a solution?
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