The key lights when pressed to put a call on hold and stays lit until the held call has been resumed, or flashes if one call is held while another is engaged; the key is dark when no calls are on hold. The key lights when pressed to access voicemail messages, call logs, network settings, user preferences, corporate directories, and XML services; it stays lit while menu items are active. The key lights when there is new voicemail, and the light is visible on both the phone chassis and the handset; it stays lit until you process your new voicemail. Co-branding button allows customers to include their logo on the Cisco Unified IP Phone 6900 Series phones. Cisco has approved third- party vendors to produce the buttons.A white backlit, monochrome, 396 x 162 pixel-based display with anti-glare screen provides scrollable access to calling features and text-based XML applications.