Amazon.com : Cisco SPA504G 4-Line IP Phone with 2-Port Switch, PoE and LCD Display, Silver, Grey (Renewed) : Office Products
Amazon.com: WirelessFinest Headset Headphones with Volume + Mute Control Replacement for Cisco SPA Series Spa303 Spa504g and Other, Polycom Soundpoint IP 320 330, Grandstream, Cortelco : Electronics
Used Cisco | CP-7940
Phone Amego with Cisco IP Phone
Integration with Cisco SPA and 3PCC series phones - MiaRec Documentation