Android Call blocking with telezap?

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Does anyone know of any app that can blacklist say telemarketers and either answer a call and send a tri-tone telezap? In theory this is supposed to tell cold callers call systems to remove this number as it will play the three tones you hear commonly when you call a disconnected number. Those tones should trigger t hem to automatically remove.

Im hoping theres an app out there that can do this or forward a call automatically to something like google voice and let it handle it.

Anyone heard of any such thing?

Best thing out there is callfilter in the market. But it only blocks numbers that you want that u put in a list. I use it to ignore creditors. I don't know how helpful it can be to u. Bu that's the only one I can think of

thanks for the input