I use Tele-Zapper ( the most recent version ). It emits a three tone sound that zaps recorded messages on my phone. In addition, the computers calling me recognize the unique tones and take me off their list. It isn't perfect but it works often, but I see a big decline in the number of compuiter calls since I started using it, about three weeks ago. As for other nuisance calls, I never pick them up. I screen these calls and use the block feature on my phone on any call that has an unknown name or anything like that.
Caller: unknown name