Strong interface capacity,Optimized call route,SMS functions,Caller's ID,Many more other functions as traditional PBX. PBX Feature:PBXs, a popular technology in the past 20 years, were welcome by group customers, which offered best solutions to the internal communications of group customers. These PBXs are usually connected to PSTN by fixed lines. But today’s PSTN, which include fixed line PSTN, ...