Cisco IP Phone 7800 Series - Connect a Key Expansion Module to a Cisco IP Phone

Connect a Key Expansion Module to a Cisco IP Phone
If you want to install more than one key expansion module, you repeat steps 7-9 to connect the other key
expansion modules together.
Procedure
Step 1 Unplug the Ethernet cable from the phone.
Step 2 If installed, remove the footstand from the phone.
Step 3 Locate the accessory connector covers on the side of the phone.
This diagram shows the location.
Step 4 Remove the two accessory connector covers, as shown in the diagram.
Cisco IP Phone 7800 and 8800 Series, Cisco IP Conference Phone 7832, and Cisco ATA 190-SC User Guide for Webex Calling (formerly Spark
Call)
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Add Buttons to Your Phone (8800 Series)
Connect a Key Expansion Module to a Cisco IP Phone