1.Communication: ITU-T H.323V4, SIP v2 2.V6801 Voip video phone support PSTN 3.Video frame rate:Maximum CIF 30FPS key features ... , DNS, PPPoE, RTP, NAT, UDP, RTP, RTCP, TFTP5)Bandwidth Support: 16kpbs--512kpbs6)Network interface: 10/100Base-T,2×RJ-457)PSTN:1xRJ118 ... /CTN:2.08kg Unit Carton measure:360*330*130mm V6801 Voip video phone support PSTN