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Google Voice offers this as an option; they're fairly big.

• StavrosK 8y ago
  They have a "Press 1 to be connected" option? Where?
  • chooseaname 8y ago
    Not who you're replying to, but I just looked and the only option I see is you can turn on screening and so when you pick up, you hear the person's name and can decide to take the call or not.
    • StavrosK 8y ago
      Yeah, plus spam filtering, which AFAIK doesn't work like the GP's solution. I think the other commenter was just confused.
    • skykooler 8y ago
      And you can choose to disable screening for numbers that are already in your contacts.