IAD04(W:4S) 4 port VOIP gateway include 4 FXS ports gateway,and with 1 WAN and 1 to 4 LAN ports,and 1 WIFI model. IAD04(W:4S ... network protocol: IP,TCP,RTP,RTCP,ICMP,ARP,HTTP,BOOTP,FTP,PPPOE,DHCP,SNMP Management mode: WEB,Telnet command line,Console for ... fax through internet and trunking gateway l support FXS and FXO 1:1 binding for 2 PSTN number for one phone and intelligent l routing ...