1) 8 port(8 SIM Card) wireless (GSM or CDMA) VOIP gateway. 2) ... GSM Cellular Network2,SMS receiving/batch sending, AT command compatible3,Support SIP registration and peer-to-peer4, ... HTTP, FTP, TFTPConfiguration andMaintenance·Web-based GUI·Console, Telnet command line·Centralized network managementFirmware UpdateLocal file, FTP, TFTP and ... need order SinoV-X500 type. 4 Port Wireless GSM Voip Gateway