Cisco Unified IP Phone Cannot Obtain IP Address
Problem
If a phone cannot obtain an IP address when it starts up, the phone may not be on the same network or VLAN
as the DHCP server, or the switch port to which the phone connects may be disabled.
Solution
Ensure that the network or VLAN to which the phone connects has access to the DHCP server, and ensure
that the switch port is enabled.
Cisco Unified IP Phone Displays Security Error Message
Problem
The phone displays Security Error on the screen.
Cause
When a Cisco Unified IP Phone boots, it performs an internal Power On Self Test (POST). POST checks for
existing encryption functionality. If POST detects that encryption functionality is missing, the phone fails to
boot, and the message “Security Error” appears on the screen.
Solution
To correct the problem, perform the following steps:
1. Reset the phone manually.
2. If the phone does not start up properly, power up the phone with the handset off-hook. When the phone
is powered up in this way, it attempts to launch a backup software image.
3. If the phone still does not start up properly, perform a factory reset of the phone. For instructions, see
Perform Factory Reset, on page 21.
Cisco Unified IP Phone Resets Unexpectedly
If users report that their phones are resetting during calls or while idle on their desk, you should investigate
the cause. If the network connection and Cisco Unified Communications Manager connection are stable, a
Cisco Unified IP Phone should not reset on its own.
A phone resets if it has problems connecting to the Ethernet network or to Cisco Unified Communications
Manager.
Physical Connection Problems
Problem
The physical connection to the LAN may be broken.
Troubleshooting and Maintenance
5
Troubleshooting and Maintenance
Cisco Unified IP Phone Cannot Obtain IP Address
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