Type:VoIP Gateway Channel:16 Call Control Protocol:SIP SMS Codec:PDU TXT Frequency:850 900 1800 1900MHz Voice CODECs:G.729A, G.723.1, G.711 a ulaw Encryption:Ejoin,VOS2000,RC4,XOP.Base64 Protocols:IPv4, TCP, UDP, PPPoE, DHCP, DNS, NAT, Telnet, HTTP, FTP, TFTP RTP RTCP:RFC3551 Power Supply:100-240VAC, 50 - 60 Hz Warranty:12 Months