Auto GPRS/UMTS connect or reconnect (no AT commands required)

AT Modem mode for optional

Featured SMS Direct mode which can transparently convert serial data to SMS or vice versa without using AT Commands. Verification of incoming Caller ID is implemented to block un-authorized users

Support CSD communication (only receive CSD call)

Transparent TCP and UDP socket connections

Supports ICMP, DDNS, SNTP, Telnet

Supports Modbus RTU to Modbus TCP

Auto reboot via SMS/Caller ID/Timing

Various dial-up policies: Always Online/Connect on Demand

Configuration methods: RS232/RS485/USB/SMS/TCP/RobustLink

Firmware upgrade via RS232/USB/TCP/RobustLink

Watchdog for reliable communications

Modbus slave (optional)