Google Call Screening: a personal robot that talks to, hangs up on spam calls

Is it possible to make an app that intercepts phone calls and becomes a self hosted question / answer bouncer?

This is something I have wanted for a long time, but had always assumed that it would have to work with like a voip solution instead of on the handset itself.

I'd like to have something similar to this feature with my own customization, but without handing the info to google to process anything, including the metadata.

it could be as simple as, do I already now you? press or say one. You are calling during a time in which I am normally napping, is this important enough to push through a call and interupt, or perhaps do an sms or voice message to be delivered within the next 3 hours?

It's been a dream, but not one that would have me giving up more data other more parties just to live a few time in real life. If it can be coded to run on the phone, or even with some twillio type service, I'd consider getting a new phone number, but not another data vacuum.

Jolly Roger Phone Company has done this, and it's robots are downright savage :D I love when a telemarketer gets into one of my traps

Perfect feature for me. I prefer to not talk to people.