... the features.GSM 400E is a 4 port wireless Asterisk PCIE card which is mainly applied to GSM, PSTN ... Phone.2,Supports GSM, CDMA two kinds of wireless communication standard.3,Support GSM: 850M/900M/1800M/ ... (CDMA) Call back4, GSM (CDMA) wireless bypasses system5, GSM (CDMA) wireless call centre.Hardware and software requirements:1, ... .4.x or 2.6.xSize and Weight1, Size(L*W*H): 210*105*24MM2, Weight: ...