... PSTN, which include fixed line PSTN, wireless CDMA PSTN, wireless GSM PSTN, NGN PSTN etc., are greatly different from traditional fixed line PSTN. That is traditional PBX ... of accessing to new generation diversified PSTN. We need new PBX to match new PSTN.TelePower has been working on R ... functions of TelePower’s wireless PBX and IP-PBX 1. Strong interface capacity: can access to PSTN, CDMA, GSM, and IP ...