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/RARP, ICMP, DNS (A record and SRV), DHCP, PPPoE, TFTP, NTP. 2)Dual 10/100mbps Ethernet ports, 2 USB (2.0) host ports, 2.5mm headset jack 3)Advanced Digital Signal Processing (DSP), Silence suppression, VAD, CNG, AEC, AGC.4) ...
