1) 8 port(8 SIM Card) wireless (GSM or CDMA) VOIP gateway. 2)support self billing,account ... , UDP, PPPoE, DHCP, DNS, NAT, Telnet, HTTP, FTP, TFTPConfiguration andMaintenance·Web-based GUI·Console, Telnet command line·Centralized network managementFirmware UpdateLocal ... CDMA/WCDMA ,you need order SinoV-X500 type. 4 Port Wireless GSM Voip Gateway