I have been using a company called Teleblend (formerly SunRocket) for many years now. Unlimited selective call blocking plus tons of features like sim ring, call fowarding, voicemail, unlimited local and long distance, etc. Service has been rock solid and works over my Comcast internet. They offer teaser introductory rates but in reality after that it will cost you about $15/month for annual billing and about $20/month for monthly billing. I ended up on this comcast discussion forum researching if there were any advantages of me going over to comcast triple play but I can't live with only 12 blocked numbers.
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