MS Teams SBA

Hi Guys

I'm after some more info regarding SBA functionality in Teams, like how it works and the features it supports, i cant find anything on MS sites apart from https://docs.microsoft.com/en-us/microsoftteams/direct-routing-survivable-branch-appliance, any videos out there maybe something from ignite.

One question i have is will response groups still work, what happens to an incoming call?

any info would be great 

Thanks

Dave