Google Voice now lets you decide who goes to voicemail
 

Google now lets you customize how its Voice service handles incoming calls. Starting today, you can configure the app to forward calls from either individual or groups of contacts to a linked phone number or your voicemail. Separately, you can set a rule that plays custom voicemail greetings for specific contacts. And if you want to avoid taking calls unless absolutely necessary, you can tell it to screen individuals.

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