The Cisco SPA525G IP Phone is a full-featured VoIP phone that provides voice communication over an IP network. It provides 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, bluetooth headset or speaker. The Cisco SPA525G is compatible with SIP standard based platforms, as well as Cisco’s UC Express / UC520 platform. 5 Line IP Phone, Color LCD Display, BlueTooth Enabled. SIP and Cisco UC Express / UC520 Support. PoE Compatible, Connect via wired ethernet or Built-In 802.11G WiFi client (buy one extra PA100 if used in WiFi). Integrated XML Web applications, MP3 player, Digital Image Viewer / Picture Frame. Sold without power supply (PA100). It is used to provide power when in-line power over Ethernet is not available.