Chapter 7 Troubleshooting and Maintenance
Resolving Startup Problems
7-2
Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
•
Symptom: The Cisco Unified IP Phone Does Not Register with Cisco Unified
Communications Manager, page 7-3
•
Symptom: Cisco Unified IP Phone Unable to Obtain IP Address, page 7-8
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 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
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:
–
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 after attempting these solutions, the LCD screen on the Cisco Unified IP Phone
does not display any characters after at least five minutes, perform a factory reset
of the phone (see the
“Where to Go for More Troubleshooting Information”
section on page 7-16
). If the phone still does not display characters, contact a
Cisco technical support representative for additional assistance.
Summary of Contents for 3911
Page 4: ......
