Cisco 7975G Troubleshooting And Maintenance page 2

Cisco Unified IP Phone Does Not Register with Cisco Unified Communications Manager
Solution
To determine whether the phone is faulty, follow these suggestions to systematically eliminate these other
potential problems:
1. Verify that the network port is functional:
2. Verify that the phone is receiving power:
3. If the phone still 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.
4. If the phone still does not start up properly, perform a factory reset of the phone.
If after attempting these solutions, the LCD screen on the Cisco Unified IP Phone does not display any
characters after at least five minutes, contact a Cisco technical support representative for additional assistance.
Related Topics
Cisco Unified IP Phone Does Not Register with Cisco Unified Communications Manager
If the phone proceeds past the first stage of the startup process (LED buttons flashing on and off) but continues
to cycle through the messages displaying on the LCD screen, the phone is not starting up properly. The phone
cannot successfully start up unless it is connected to the Ethernet network and it has registered with a Cisco
Unified Communications Manager server.
These sections can assist you in determining the reason the phone is unable to start up properly:
Phone Displays Error Messages
Problem
Status messages display errors during startup.
Troubleshooting and Maintenance
2
• Exchange the Ethernet cables with cables that you know are functional.
• Connect a operational phone to this network port to verify the port is active.
• Replace an operational phone with the nonoperational phone.
• Connect the nonoperational phone directly to the port on the switch, eliminating the patch panel
connection in the office.
• If you are using external power, verify that the electrical outlet is functional.
• If you are using in-line power, plug the phone into an electrical outlet using the external power supply.
• If you are using the external power supply, switch the power supply with a unit that you know works.
• Make sure that the phone is connected to a switch that supports IEEE 802.3af Class 3 (15.4 W in-line
power at the switch port).
Phone Startup Process
Cisco Unified IP Phone Power
Factory Reset, on page 20
Troubleshooting and Maintenance