... , PPPoE, DHCP, DNS, NAT, Telnet, HTTP, FTP, TFTPConfiguration and Maintenance·Web-based GUI·Console, Telnet command line·Centralized network managementFirmware UpdateLocal ... temperature: 0 - 50ºC·Operating humidity: 10 – 90%Warranty12 MonthsWEB:Application:1,GSM to VOIP and VOIP to GSM2,diagram:We ...