The SPA2100 features two RJ11 POTS (Plain Old Telephone Service) ports for connection to existing analog phones, fax machines, PBX and key system communication platforms. Each SPA2100 telephone port can be independently configured via software controlled by the service provider and/or the end user. The SPA2100 also includes two RJ45 Ethernet ports. One Ethernet port connects to a broadband modem or router (WAN), while the other is an outgoing Ethernet port for connecting an additional PC or other device (LAN).