I installed Jitsi Meet at my company, but people are complaining because a lot of times it's a crapshoot whether it works or not. And troubleshooting it is a pain in the ass.

Is there any alternative FOSS VOIP solution similar to Jisti Meet? Preferably, also browser-based.

I'm aware of BigBlueButton but the only platform it supports seems to be Ubuntu 18.04, which is ancient.