... Moreover, can be used as gsm-modem to transmit data, used for alarm transfer, audio quality is very good, with SMT ... made board, DUAL BAND 900/1800MHz SIM CARD GSM FIXED WIRELESS TERMINAL ... billing device/PBX/VOIP, GSM gateway , Single port 1 SIM card GSM fixed wireless terminal(FWT), 1 SIM card GSM FWT/GSM Gateway Support Payphone and Alarm System ...