Each USB port supports a maximum of five USB devices. The charging time is like what you would expect from connecting to a USB port on a laptop computer. This is intended for use with a Key Expansion Module, but it can also be used for connecting a USB headset or for charging a small device like a SmartPhone. There is a Universal Serial Bus (USB) port on the right-hand side of the phone. Ask your provider about available key expansion modules for your phone. Next to the USB port on the right-hand side of the Cisco IP Phones 8851, 88, there is a custom-built power port for the key expansion Module.The DC port allows you to use a power adapter, if you do not utilize power over ethernet.This connection allows you to connect the wired handset that comes with the phone.This connection allows you to connect a wired headset to use with your desktop phone.This port serves as a serial console port to access the phone's terminal.The PC access port allows you to provide a network connection to your computer via your desktop phone.The back button returns to the previous screen.The messages button will autodial your voicemail mailbox when pressed.Use the contacts button to open and close the directories menu.Use the application buttons to access call history, user preferences, phone settings, and phone model information.The volume button allows you to adjust the handset, speaker and ringer volume of the phone.Used to input numbers and characters into the phone system.Headset, speaker and mute keys are located along the right edge of the phone.The conference button allows you to create a conference call.
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