Check out this video from DEMO 2006 of Ottawa based Iotum:
"iotum™ is the world's first platform to intelligently filter, rank and prioritize calls based on their relevance to you. Using your contextual information and preferences, iotum™ knows who’s calling, whether you want to take the call, and which phone you want to use. You get the calls you want, where you want – and next time your phone rings, thanks to iotum™ you’ll know it’s totally, completely, always, simply relevant."
Link to DEMO 2006 video.
