WPBX Strong interface capacity,Optimized call route,SMS functions,Caller's ID,Call recording,SMS. WPBX WPBX Feature: PBXs, a popular technology in ... capacity: can access to PSTN, CDMA, GSM, and IP networks.2. Optimized call route: can access to different networks CDMA, GSM, ... number always in the same networks, best solution to call cost. With IP-PBX, users can make international calls while enjoying ...