Need an app to block Private Numbers with a custom Voice message.

I need an Android App that will suppress any ringing on my phone, allow the playing of a Voice message advising the caller to unblock their number (Ie: Enable Caller ID) and call again.

Ideally, there would be no ring on my phone by calls without caller ID enabled and they would automatically get rejected and given the opportunity to leave a voice mail with a return number.

This would take care of 95% of the spam/scam calls & SMS's that I receive.

I do engage in the occasional scam baiting, so I'd like to have the option of letting those calls through occasionally when I'm in the mood, but for the most part, I want all private numbers blocked.

Anyone know of such an App?

Edit: Please also see my comment here: https://www.experts-exchange.com/questions/29111040/NEED-HIGH-LEVEL-cellular-system-design-engineer-developer-to-answer-please.html#a42636117
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Andrew LeniartEE Senior Editor & Independent IT ConsultantAsked:
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kinetik20Commented:
I just found this from a quick google search. https://play.google.com/store/apps/details?id=com.mrnumber.blocker&hl=en_US 

Have you given it a try?
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Andrew LeniartEE Senior Editor & Independent IT ConsultantAuthor Commented:
Thanks for the suggestion kinetik20. I've now given it a try and it seems buggy so have uninstalled it. This is confirmed by the many reviews on play.google.com

Anyone else have any suggestions?
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