Microsoft Teams is a huge step backwards from Skype for Business.
Teams to all the options off the table. You can't easily tell it whether to ring on your headset or ring over your speakers. The calls come through as if someone is calling be direct, the they are actually calling a group. You can't easily add to a group that you had in Skype for Business (i.e. new employee can't receive all office calls), The contact list is better than Skype for Business, but it's so confusing that we don't know what list to enter a new number and once you do, the changes may or may not show up.