... ports: 4 FXS;interface: 10/100BASE-T WAN port,1-4 10/100BASE-T LAN ports;1 RS232 ... port;VoIP protocol: H323 v2,H323 v4,SIP,compliance ... BUFFE Security l Embedded firewall module, packet filter, IP port shielding, anti URL attack Support signaling, media, fax encryption ... MG devices with H.323 and SIP protocol from l CISCO,Notel,Lucent,ZTE,Huwei,UT. Power supply l VDC ...