I have no special insight, but it's a fact that SA drops VoIP traffic. The UX for that is pretty bad, calls fail to connect by timing out after 5min or whateve

I have no special insight, but it's a fact that SA drops VoIP traffic. The UX for that is pretty bad, calls fail to connect by timing out after 5min or whatever, and people are left trying over and over again or waiting around hoping the call will connect. I think it could make sense to short circuit that process and display an immediate error to the caller that lets them know this call just isn't going to work. The author's suggestion that it's impossible for SA to block VoIP without blocking messaging is incorrect.