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"Think about it for a moment: do you recall a single instance when you were actually glad that you answered a telephone call from a blocked number? Unless that bill collector turned out to be your future spouse, the answer is likely no. Now, Google Voice users will find an extra perk in the online settings that should take the edge off of receiving calls from unknown sources. You'll now find the ability to screen anonymous callers, whereby the system will prompt the individual to state their name, and only then will your phone ring. From there, you'll have the option of answering the call, sending it to voicemail, or even listening in as the caller leaves a voice message -- kinda like back in the days of answering machines. Similarly, you'll also find the ability to apply this same screening process to callers who aren't in your address book. As proof that Google isn't a total grouch, it's also thrown in a new option that allows you to customize a warm greeting for those contacts who are, in fact, in your address book. After all, it never hurts to show some love."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/05/31/google-voice-anonymous-call-screening/?ncid=rss_semi>