SPA500S Expansion Modules (32 button attendant consoles). Enhanced network connectivity with Power over Ethernet (PoE), 802.11g Wi-Fi client with Wi-Fi Protected Setup (WPS), and Bluetooth headset support. Graphics-rich, high-resolution 3.2-inch QVGA 320 x 240 color screen. Support for multimedia functions, such as playing MP3s, displaying digital photos, and viewing RSS feeds. Wideband audio for unsurpassed voice clarity and enhanced speaker quality. Support for both Session Initiation Protocol (SIP).