IP PBX 8FXS or 8FXO SIP server: 2 IP account with password protection IP PBX ... DNS-SIP server: 2 IP account with password protection-Pubic Server/ Private server: can connect to ISP and Private SIP server at same ... : STUN, NAT ALG, NAPT, SIP Express router-2 RJ-45 auto-sensing 10/100Mbps, with Router or ... PPPoE client-Static IP / DHCP / PPPoE-DNS client with 2 servers IP Audio Codec G.711 µ / A G. ...