Device interfaces: 2 x FXS RJ-11, 4 x 10/100/1000 Ethernet LAN, 1 x 10/100/1000 Ethernet WAN, 1 x PSTN with RJ-11 connector, USB 2.0 port; Voice Gateway: 2 x FXS RJ-11, 4 x 10/100/1000 Ethernet LAN, 1 x 10/100/1000 Ethernet WAN, 1 x PSTN with RJ-11 connector, USB 2.0 port; SIP: Dialing in the standard E.164, Redundant SIP PROXY (registration), Supports NAT (NAT keep-alive), Call without registration, STUN-client, Supports DHCP option 120, Supports SIP URI format, Outbound proxy support, Types of calls: voice/modem/fax, P2P, Dial plan, Registration by SIP server IP address or domain name, Individual account for each port
* Recommended retail price