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 ... JITTER BUFFE Security l Embedded firewall module, packet filter, IP port shielding, anti URL attack Support signaling, media, fax encryption, anti ... ,MG devices with H.323 and SIP protocol from l CISCO,Notel,Lucent,ZTE,Huwei,UT. Power supply l VDC: 12V ...