MS Teams can be used to delivered live (synchronous) lectures up to groups of 250 participants. It does not include breakout room functionality and it is not integrated into Sulis.
Learn more here about Delivering a lecture with MS Teams. Also, see this super-useful post: 3 Features to Help You Organise Your MS Stream Videos.
For groups of over 250, it is possible to stream a live lecture through MS Teams Live Events but this is designed as a broadcasting service with an in-built delay (e.g. similar as live television) and not for interactive teaching. Learn more: