Groundhog day
In communist countries, back in the day, when you called someone over the phone, there would be an officer officially listening to the conversation. They would say "this conversation is monitored, carry on". They would make notes who called whom and a brief what it was about.
Of course they didn't have enough agents, so it was at random or if you were a person of interest then almost always.
It's not hard to imagine that government will require providers to install a black box, where government will be performing its own filtering and detection without telling what is being looked for.
In a few years time, they will also develop conversation anomaly detection, where you may be flagged as e.g. potential agent of change and would have your social credit score lowered and people you associate with would get a warning that their score will be reduced if they continue to contact you.
In my opinion, anyone suggesting implementation of these things should be removed from power.