One thing I’ve learnt to look for is a kind of company that is not open or active 24/7, something that runs on daytime office hours only. Helps to cut down the possibilities for after hours work bullshit happening.

So Teams calls of 1-4 people can send traffic direct peer-to-peer if they’re on the same LAN right?
Do all calls of 5+ users stay centrally hosted on the cloud? These are the kinds of things that MS should document and make easily available for IT and firewall admins. Finding info on Teams ports wasn’t easy in my experience.