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Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
Chapter 7 Troubleshooting and Maintenance
General Troubleshooting Tips for the Cisco Unified IP Phone
Moving a network connection from
the phone to a workstation.
If you are powering your phone through the network
connection, you must be careful if you decide to unplug the
phone’s network connection and plug the cable into a desktop
computer.
Caution The computer’s network card cannot receive power
through the network connection; if power comes
through the connection, the network card can be
destroyed. To protect a network card, wait 10
seconds or longer after unplugging the cable from
the phone before plugging it into a computer. This
delay gives the switch enough time to recognize that
there is no longer a phone on the line and to stop
providing power to the cable.
Changing the telephone
configuration.
By default, the network configuration options are locked to
prevent users from making changes that could impact their
network connectivity. You must unlock the network
configuration options before you can configure them. See the
“Unlocking and Locking Options” section on page 4-2 for
details.
Phone resetting. The phone resets when it loses contact with the Cisco Unified
Communications Manager software. This lost connection can
be due to any network connectivity disruption, including cable
breaks, switch outages, and switch reboots.
LCD display issues. If the display appears to have rolling lines or a wavy pattern, it
might be interacting with certain types of older fluorescent
lights in the building. Moving the phone away from the lights,
or replacing the lights, should resolve the problem.
Dual-Tone Multi-Frequency (DTMF)
delay.
When you are on a call that requires keypad input, if you press
the keys too quickly, some of them might not be recognized.
Table 7-1 Cisco Unified IP Phone Troubleshooting (continued)
Summary Explanation
89


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