Lots of folks hit the nail on the head, it's a structural problem with a telco network that was never designed to be open. I wrote about it back in 2019 in case

Lots of folks hit the nail on the head, it's a structural problem with a telco network that was never designed to be open. I wrote about it back in 2019 in case folks are interested [0] [0] https://www.twilio.com/en-us/blog/insights/compliance/your-phone-your-call-eliminating-robocalls https://www.twilio.com/en-us/blog/insights/compliance/your-p...