What if we built an app in Twilio that is like the "firewall or Cloudflare for phones". Unless you are whitelisted or in the contacts, the call will be routed t

What if we built an app in Twilio that is like the "firewall or Cloudflare for phones". Unless you are whitelisted or in the contacts, the call will be routed to voicemail automatically. You can get creative with that and may be even add things like voice captcha. "Thanks for reaching out. Since I don't know you, please press 1 to proceed further". This will weed out the auto callers/robots ?