The 2015 New Version is made for the Last ASUS routers RT-ACXXX
Tested on RT-AC56U router with strong ARM processor this version is powerfull and can work like a traditional server
It have all features
- Hotel PBX
- Captive portal wifi access with history
- Great router with VPN server
This new version on new router have no limitations and work like a strong server !
Check here for Cyber-wrt 2012 PBX user guide (This guide is ok also for 2015 version except the new features)