Skype for Business client as a softphone

Greetings nerds. You can consider me a noob with asterisk.

Asterisk Version: 13.7.2
Current Softphones: BRIA 5
We have Office 365 E5 license

While Bria is a breeze to setup, I would like to use Skype for business as our softphone but have all calls routed through Asterisk and not use Office365 as our phone system. Since I am such a noob, I can’t seem to find out how to do this. Adding additional products to the mix is in my budget to get this to work if need be.

I believe I need sipgate or something that will translate skype sip into asterisk sip.

Thanks!