LevelOne 4FXS and 4FXO H323/SIP Gateway. Supported network protocols: SIP & H.323; UDP, TCP, NAT, BOOTP, TFTP, FTP, HTTP, TELNET, IEEE 802.3/ IEEE 802.3u. Networking features: SNMP, SNTP, HTTP, FTP, NAT, DNS, uPnP, DDNS. Power requirements: 100-240VAC; 12VDC@1.5A. Operating temperature range (T-T): 0 - 45 °C, Storage temperature range (T-T): -20 - 75 °C, Operating relative humidity range: 0 - 90 %. Certification: FCC, CE