... Optimized call route,SMS functions,Caller's ID. PABX Feature: PBXs, a popular technology in the ... include fixed line PSTN, wireless CDMA PSTN, wireless GSM PSTN, NGN PSTN etc., are greatly different from ... interface capacity: can access to PSTN, CDMA, GSM, and IP networks.2. Optimized call route: can ... access to different networks CDMA, GSM, PSTN etc. based on different called numbers, ...