... the access of wireless (GSM and CDMA), PSTN, Phone.2,Supports GSM, CDMA two kinds of wireless communication standard.3,Support GSM: 850M/900M/ ... 1800M/1900M, CDMA: 800M.4,Support 4 channels, user can choose to insert wireless, FXO or FXS module ... user can choose to insert wireless, FXO or FXS module to each channel. GSM400E realize the integrate of Wireless(GSM or CDMA) and PSTN ...