Cisco 7821 - Your Phone; Cisco IP Phone 7800 Series Overview; Phone Setup and Configuration; Feature Support and Updates

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Part A: Cisco IP Phone Quick installation Guide
Step 1: Physical network cables connection
Connect the network cables to network socket and user’s PC as the figure shows
below:
To NetworkOutlet To EndUser’ sPC
IP Phone 6921/6945 rear view
IP Phone 7821/7841 rear view
To NetworkOutlet To EndUser’ sPC