Audio And Video Problems; Phone Display Is Wavy; No Speech Path - Cisco 7975G Troubleshooting And Maintenance

Troubleshooting and Maintenance
Solution
To enable it, see
Factory Reset of Phone Has Deleted 802.1X Shared Secret
Problem
After a reset, the phone does not authenticate.
Cause
These errors typically indicate that the phone has completed a factory reset (see
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, you have two options:
• Temporarily disable 802.1X authentication on the switch.
• Temporarily move the phone to a network environment that is not using 802.1X authentication.
Once the phone starts up normally in one of these conditions, you can access the 802.1X configuration menus
and re-enter the shared secret (see

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.
802.1X Authentication and Status
802.1X Authentication and Status
Factory Reset of Phone Has Deleted 802.1X Shared Secret
Menus.
Menus).
Troubleshooting and Maintenance
Factory Reset, on page 20)
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