I have my own frustrations with Twilio but one cool feature is to just flat Reject a call. I porteted numbers I needed into Twilio and made a greylist app. You

I have my own frustrations with Twilio but one cool feature is to just flat Reject a call. I porteted numbers I needed into Twilio and made a greylist app. You can rotate numbers in/out to de-spam them (a bit)