Chapter 7 Troubleshooting the Cisco Unified IP Phone
General Troubleshooting Tips
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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SCCP), Cisco Unified IP Phones
OL-8151-01
Moving a network connection from
the phone to a workstation
If you are powering a 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
for details.
Phone resetting
The phone resets when it loses contact with the
Cisco Unified CallManager 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
Содержание 7902G - Unified IP Phone VoIP
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