That's what I was getting at, S/S seems like a foundational step, before being able to whitelist/blacklist. You first need to be certain about the source of the

That's what I was getting at, S/S seems like a foundational step, before being able to whitelist/blacklist. You first need to be certain about the source of the call before you can actually moderate it. Without authentication, spoofing makes banning numbers meaningless and dangerous.