The Draytek 2820VSN router is compatible with both ADSL/ADSL2+ and cable technologies. In addition to this the router also support 3G modem technology. The Gigabit port on the router provides a faster link where needed be that to a gigabit switch or to a server on the network. The VSN model is a ADSL/ADSL2+, ISDN, 3G and Broadband Router with Two ISDN2e (BRI) Interfaces, one 'FXS' Phone Ports, one 'FXO' Line Port for connection to analogue (POTS) line automatic phone switch-over for incoming calls on either PSTN or VoIPThe firewall within the 2820 series offers the latest security protection for DDOS, IP based attacks and access from unauthorised remote systems. The 2820 is the perfect router for the business and of course its fully SIP aware.