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Model 7821 has two buttons one side of the display, the 7841 has two buttons on each side allowing for two more features if needed.Tip: To adjust the phone's "high" or "low" angle pull the silver stand out from the back and flip it over, then re-seat the tabs.
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Model 8851 has five buttons on either side of display.Tip: Unlike the Model 7821, there is only one angle option for this model phone.
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Model 3905 is found in classrooms, labs, hallways, etc.
Using Headsets with Cisco Phones
Updated 4/14/20 by Terri-Lynn Hurley