Specifications

9-2
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5
OL-23092-01
Chapter 9 Troubleshooting and Maintenance
Resolving Startup Problems
Symptom: The Cisco Unified IP Phone Does Not Go Through its Normal Startup
Process
When you connect a Cisco Unified IP Phone into the network port, the phone should go through its
normal startup process as described in the “Verifying the Phone Startup Process” section on page 3-14,
and the LCD screen should display information. If the phone does not go through the startup process,
the cause may be faulty cables, bad connections, network outages, lack of power, and so on. Or, the
phone may not be functional.
To determine whether the phone is functional, follow these suggestions to systematically eliminate these
other potential problems:
1. Verify that the network port is functional:
– Exchange the Ethernet cables with cables that you know are functional.
– Disconnect a functioning Cisco Unified IP Phone from another port and connect it to this
network port to verify the port is active.
– Connect the Cisco Unified IP Phone that will not start up to a different network port that is
known to be good.
– Connect the Cisco Unified IP Phone that will not start up directly to the port on the switch,
eliminating the patch panel connection in the office.
2. Verify that the phone is receiving power:
– If you are using external power, verify that the electrical outlet is functional.
– If you are using in-line power, use the external power supply instead.
– If you are using the external power supply, switch with a unit that you know to be functional.
– 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). For more information, see Providing Power to the Phone,
page 2-4.
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. For instructions,
see Performing a Factory Reset, page 9-15.
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.
Symptom: The 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:
• Identifying Error Messages, page 9-3
• Checking Network Connectivity, page 9-3