The Cisco SPA504G is a full-featured VoIP (Voice over Internet Protocol) phone that provides voice communication over an IP network. These phones provide traditional features, such as call forwarding, redialing, speed dialing, transferring calls, conference calling and accessing voice mail. Calls can be made or received with a handset, headset or over a speaker. IP phones also have special features not available in traditional phones. The Cisco SPA504G contains Dual Ethernet ports, or ports that allow them to be linked to the computer network. They also have additional Ethernet ports that allow a computer to be connected to the network through the IP phone.
Unlike traditional phones, SPA500 Series Phones require a separate power source. You can power the phones by connecting them to a switch that provides Power over Ethernet (PoE), or by using an optional PA100 power adapter.
