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CHAPTER 1 
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The Cisco IP Phones 8841, 8851, 8861, and 8865 deliver easy-to-use, highly-secure voice 
  communications. 
Figure 1: Cisco IP Phone 8800 Phone 
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Table 1: Cisco IP Phone 8800 Series Major Features 
Cisco Intelligent 
Proximity
 
 
 
 
 
When you add features to your phone, some features require a line button. But each line button on your phone 
  can support only one function (a line, a speed dial, or a feature). If your phone's line buttons are already in use, 
  your phone won't display any additional features. 
 
Phone Setup 
Typically, your administrator sets up your phone and connects it to the network. If your phone is not set up and 
  connected, contact your administrator for instructions.