Ultimate Caller ID Screeners?

omasse asks: "I'm sick of telemarketing. Really sick. And since I'm in Canada, the new U.S. telemarketing law won't change a thing for me. The only easy solution is a technological one, and it ought to be fully transparent: No phone in my house should ring at all if it's an undesired call, and friends and family should not have to enter a 5-digit code to make them ring. To my knowledge, the only gadget that could do this is a sharp filter based on caller ID that I plug in my main phone drop. But Digitone's Caller ID Screener has been announced some time ago, there are no guarantees they'll meet their fall 2003 deadline, and I would prefer having a few products to chose from. There's been a discussion here once on a DIY home PBX system but that's way, way overkill for me. Could anyone tell me what are the ultimate Caller ID Screeners?"