Audio And Video Problems; Phone Display Is Wavy; No Speech Path; Choppy Speech - Cisco Unified IP Phone 8941 Administration Manual

Cause
These errors typically indicate that the phone has completed a factory reset while 802.1X was enabled. A
factory reset deletes the shared secret, which is required for 802.1X authentication and network access.
Solution
To resolve this situation, temporarily move the phone to a network environment that is not using 802.1X
authentication. After the phone starts up normally, access the 802.1X configuration menus to enable device
authentication and to reenter the shared secret. See 802.1X Authentication section for details.
Related Topics
Basic Reset, on page 187

Audio and Video Problems

The following sections describe how to resolve audio and video problems.

Phone Display Is Wavy

Problem
The display appears to have rolling lines or a wavy pattern.
Cause
The phone might be interacting with certain types of older fluorescent lights in the building.
Solution
Move the phone away from the lights or replace the lights to resolve the problem.

No Speech Path

Problem
One or more people on a call do not hear any audio.
Solution
When at least one person in a call does not receive audio, IP connectivity between phones is not established.
Check the configuration of routers and switches to ensure that IP connectivity is properly configured.

Choppy Speech

Problem
A user complains of choppy speech on a call.
Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0 (SCCP

Audio and Video Problems

and SIP)
177