Avaya 9640 IP Telephone (700383920) 9640G IP Telephone Features * 3.8″ color backlit display * 6 line appearances supporting up to 24 call appearances or features * 4 softkeys, 4 navigation buttons * Built-in full duplex speakerphone * Dual message waiting indicators * Volume, menu, message, speaker, headset, contacts, and call log buttons * Built-in two port Gigabit Ethernet switch for connection to LAN and collocated PC * Supports wideband audio codec * Supports up to 3 SBM24 Button Modules for expansion * 2 adapter interfaces for add-on support (e.g. 9600 Bluetooth Adapter etc.) * Built-in headset interface Avaya Model 9640 vs Avaya Model 9640G Your telephone provides many features, including a Phone screen to view and manage your calls, a Call Log, a Contacts list, an integrated WML browser, a menu of options and settings, and access to your voicemail. The 9640/9640G IP Telephone provides this information in color. The “G” designation in 9640G means this telephone model has a built-in Gigabit Ethernet adapter which speeds data transmission. A telephone with the “G” designation is otherwise identical to its 9640 counterpart in terms of features and functionality.