... also provides specialized service as powerful and flexible based-SIP VoIP communication solutions, OEM and ODM services ... use the most advanced VoIP technologies. All products are based on industry standard protocl (SIP call control, G729 ... , DNS, NAT, Telnet, HTTP, FTP, TFTPConfiguration andMaintenance·Web-based GUI·Console, Telnet command line·Centralized network managementFirmware UpdateLocal file ...