My last employers were cheapskates too (I love 'em for it) and they just used meet.jit.si for calls. It was a lot more stable than self-hosted jitsi. That said

My last employers were cheapskates too (I love 'em for it) and they just used meet.jit.si for calls. It was a lot more stable than self-hosted jitsi. That said there were almost always microphone or video issues using it, just because people weren't used to it I guess. It made job interviews fun. It was a nice live test to show how a potential employee handled adversity.