Features:Standard of video communications: ITU-T H.323V4 /SIP(RFC 3261)Standard of video format: ITU-T H.263/H.264Standard of audio format: ITU-T G.711/ G.723.1A/G.729Standard of network transmission: TCP/IP, DHCP, DNS, PPPoE,RTP, RTCP, NAT, UDP, TFTP, HTTP, STUN&NTPTransmission Rate: 64kbit -640kbitSupport bandwidth..