... headset jack caller ID, call waiting, hold, transfer, for-ward, 1) SIP 2.0, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS ... PPPoE, TFTP, NTP. 2)Dual 10/100mbps Ethernet ports, 2 USB (2.0) host ports, 2.5mm headset jack 3)Advanced ... H.263 and H.264 (baseline) real-time video codec with video band-width from 32kbps – 1Mbps. 5)5.6in ... headset enabled, intercom, AES encryption. 300 degree voip video phone with USB port