The Linksys SPA-2100 is a VoIP router that allows for high-quality voice communication over the internet. It has two phone ports, making it ideal for small businesses or home offices. It supports SIP protocol and features advanced call handling and security features, including caller ID, call waiting, and call forwarding. The router is easy to set up and use and is compatible with most VoIP service providers. It also includes QoS (Quality of Service) capabilities, ensuring that voice traffic is prioritized over other types of traffic on the network.

The SPA-2100 is a router manufactured by the company Linksys that allows multiple devices to connect to a network and communicate with each other. It works by receiving data packets from devices and forwarding them to their intended destination. The router is assigned a unique IP address 192.168.0.1, which serves as its identifier on the network.

To access the router's settings and configure its functions, users can log in using a web browser and their admin and advanced. Once logged in, users can customize various settings such as network name, password, and security protocols. They can also set up parental controls, prioritize bandwidth usage, and monitor network activity.