Dual 10/100mbps Ethernet ports, 2 USB (2.0) host ports, 2.5mm headset jack caller ID, call waiting, hold, transfer ... , for-ward, 1) SIP 2.0, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/ ... ), DHCP, PPPoE, TFTP, NTP. 2)Dual 10/100mbps Ethernet ports, 2 USB (2.0) host ports, 2.5mm headset jack 3)Advanced Digital ... intercom, AES encryption. 300 degree voip video phone with USB port