... mainly used in wireless, PSTN and INTERNET environment and Asterisk PBX system needs to provide all the features. . Features:1,Support the ... happened by the external world to influence the communication,the system can reset to the clock automatically, resume normal communication 5 ... )- VoIP gateway 2, Mobile IP-PBX 3, GSM (CDMA) Call back 4 GSM (CDMA) wireless bypasses system 5 GSM (CDMA) wireless call ...