Cisco 8831NR Administration Manual page 110

Features, Templates, Services, and User Setup
Link Conference Phones
The secondary Sound Base does not need to be plugged into external power, but in Linked Mode the primary
unit must be connected to external power.
Step 4
Use the provided daisy cable to connect the primary unit to the secondary sound base.
Voice, dial tone, ringer and base LEDs synchronize between the two units.
Related Topics
Linked Mode, on page 98
Cisco Unified IP Conference Phone 8831 and 8831NR Administration Guide
100