Mediant 500 MSBR with dual-mode ADSL/VDSL over ISDN, 1000Base-T WAN and dual-mode SFP WAN Interfaces Includes Mediant 500 chassis, 4 GE switched LAN ports, and single AC power supply. Supports VoIP functionality, basic routing (static routing, RIP v1/v2, VLAN) and basic security package