TeamSpeak and Ventrillo still work great. It was a monumental mistake to switch to these 3rd party services that are bugged by every intelligence apparatus on earth.
I had a look at Teamspeak but you need to email somebody for permission to have more than 32 users on your server.
I gave up running my TS3 servers (after nearly a decade) because they added a trialware system that required getting approval/serial code from the company every month to continue operating. They were squeezing everyone on TS3 trying to force them to TS4/5/etc. Have they stopped this or walked it back?
And to be clear, Teamspeak from version 5 on is not teamspeak. It's matrix with a skin. Not that that's terrible, but it's not great for running it on low power/cost VPS like actual teamspeak was.
Those are voice chat, yeah? Discord has chat too, which is used more than voice in many of my communities.
That would be great if your community only exists in a voip channel