CISCO SPA 504G 4-Line IP Phone Corded Landline Phone  (Black)

Part of the Cisco Small Business Pro Series, the SIP-based Cisco SPA504G 4-Line IP Phone (Figure 1) has been tested to ensure comprehensive interoperability with equipment from voice over IP (VoIP) infrastructure leaders, enabling service providers to quickly roll out competitive, feature-rich services to their customers. Supports four phone lines Full-duplex Speakerphone, headset, message waiting indicator, dynamic softkeys for phone functions 4-way navigation key to easily scroll through phone features, call history directories, and on phone applications Dedicated buttons for Mute, Headset, Speakerphone, Volume, Hold, Menu settings and Voicemail access Integrated Ethernet switch port to connect a computer and reduce cable cost HD Voice for unsurpassed voice clarity and enhanced speaker quality Support for up to two Cisco SPA 500S Expansion Modules, which provide an additional 64 phone lines Monochrome backlit display for ease of use, aesthetics, and on-screen applications Paper label for bottom four line buttons Supports both Session Initiation Protocol (SIP) and Smart Phone Control Protocol (SPCP)