Solution
To determine whether the phone is functional, follow these suggestions to systematically eliminate these other
potential problems:
•
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.
•
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.
•
If the phone still does not start up properly, perform a factory reset of the phone. For instructions, see
the
Perform Factory Reset, on page 92
.
If after attempting these solutions, the phone still does not function, contact a Cisco technical support
representative for additional assistance.
Cisco Unified IP Phone Does Not Register with Cisco Unified Communications Manager
If the phone proceeds past the first stage of the startup process (all LED buttons on) but 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.
In addition, problems with security may prevent the phone from starting up properly. See the
General
Troubleshooting Information, on page 89
for more information.
Phone Displays Error Messages
Problem
Phone status message display errors during startup.
Solution
While the phone cycles through the startup process, you can access status messages that might provide you
with information about the cause of a problem. See the
Device Logs, on page 71
for instructions about
accessing status messages.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
80
Troubleshooting and Maintenance
Startup Problems
