... 3uProtocol: 802.1d/p/q/x, CSMA/CA, CSMA/CD,TCP/IP, GMP, DHCP,ICMP,HTTP,SNP, LLTD,uPnP, Telnet, ... 1p, DSCPFirewall IP/MAC binding for anti ARP spoofingIP/MAC filtering, website filteringIP PBX features:Auto Attendant IVR with time schedule, ... hot line(immediate and delay)Dial-in System Authentication with PINAccess Authentication with caller’s phone numberExtension Feature Blind transfer, Consultation ...