[akeck]

I personally find the following low tech method effective for me:

o All home calls go to voicemail without exception. We pick up if we recognize the voice or the caller. No one seems to mind except my mother-in-law. She's gotten used to it though. I've also noticed everyone below a certain age rarely uses voice.

o I've added every number with which I regularly interact to my cell address book. If a call comes in from an unknown number, it goes to voicemail without exception.

YMMV.

Being both a math and a tech person, I would like to do a cost and effectiveness study comparing the purely technical solutions from the contest with solutions like the above.