Cisco 8831NR Administration Manual page 136

DNS or Other Connectivity Errors
Solution
Isolating the conference phones on a separate auxiliary VLAN increases the quality of the voice traffic. See
the Cisco Unified IP Communications Product Interactions, on page 33
DNS or Other Connectivity Errors
Problem
The phone reset continues and you suspect DNS or other connectivity issues.
Solution
If the conference phone continues to reset, follow the procedure in
on page
Power Connection Problems
Problem
The conference station does not appear to be powered up.
Solution
In most cases, a conference phone will restart if it powers up using external power but loses that connection
and switches to Power over Ethernet (PoE). Similarly, a conference phone may restart if it powers up using
PoE and then gets connected to an external power supply.
Audio and Display Problems
The following sections describe how to resolve audio and display problems.
Display Is Wavy
Problem
The display appears to have rolling lines of a wavy pattern.
Cause
The conference phone might be interacting with certain types of older fluorescent lights in the building.
Solution
Move the conference phone away from the lights or replace the lights to resolve the problem.
Choppy Speech or Sound
Problem
A user complains of choppy speech or a metallic sound coming from or going to the far end.
Cisco Unified IP Conference Phone 8831 and 8831NR Administration Guide
126
132.
Troubleshooting and Maintenance
section for details.
Determine DNS or Connectivity Issues,