Connecting Skype Business Server 2015 to our Mitel 3300 PBX

I'm not having any luck getting these to work together. I downloaded a trial of Skype business server 2015 to see if this is something we wish to pursue. I believe I got the server working but I cannot get the server and my 3300 to communicate. All I'm looking for is Remote Call Control (RCC). Hunting through the many articles on the Internet and it looks like I need the Mitel Live Business Gateway t make this work but I cannot get a copy of this anywhere (license or trial). Anyone know where I can get a trial of this? or know of another gateway product that will do the same thing?