Cisco 8821 Troubleshooting page 4

Step 5. Note any change in the LED status on the top of the phone or on the display of the phone
itself.
Verification
If another 8821 phone charges using the same power source and the non-charging 8821 will
not charge after changing the battery for a known good battery when connected to the same
power source, the phone will need to be replaced through an RMA. Please use the RMA
Failure Code HW Fail - Power.
If no phones charge when connected to a particular power source but will charge when
connected to a different power source, the power source is likely faulty.
If the 8821 phone charges only when the battery is changed with a known good battery, the
battery is likely bad and will need to be replaced (part number CP-BATT-8821=). Please use
the RMA Failure Code HW Fail - Power.
If the metal charging plate is missing, the phone cannot be changed and the phone will need
to be replaced through an RMA. Please use the RMA Failure Code Field Notice Alert
(FN70135).
MIC (Manufacturer Installed Certificate) Not Installed
(CSCvc65418 )
The 8821 wireless phone may display a "MIC not installed" message on the phone's screen and/or
in the phone's status message log. The Manufacturer Installed Certificate (MIC) can be used for
the following:
Wireless authentication with Extensible Authentication Protocol (EAP) - Transport Layer
Security (TLS)
Cisco Unified Communications Manager (CUCM) Encrypted/Authenticated device security
mode
HTTPS access to the phone's web page
Secure Shell (SSH) to the phone
Procedure
Step 1. Check the bottom of the display for a message that says "MIC not installed" either during
the first 10 seconds of the phone turning on or persistently displayed.
Step 2. Check the phone's status messages (Settings > Admin settings > Status > Status
messages) for a line that says "MIC not installed".
Verification
The the message "MIC not installed" is seen on the phone's screen and/or in the Status
Messages, the phone has lost the MIC. If the MIC is needed for one of the functions listed above,
the phone will need to be replaced through an RMA. All functions other than wireless
authentication using EAP-TLS with the MIC can work by
(LSC). If an LSC can be used there is no need to replace the phone, it will function normally with
installing a Locally Installed Certificate