Cisco 8800 Series Guía
Maintenance
•Basic Reset, on page 1
•Perform Network Configuration Reset, on page 3
•Perform User Network Configuration Reset, on page 3
•Remove CTL File, on page 3
•Quality Report Tool, on page 4
•Voice Quality Monitoring, on page 4
•Cisco IP Phone Cleaning, on page 5
Basic Reset
Performing a basic reset of a Cisco IP Phone provides a way to recover if the phone experiences an error and
provides a way to reset or restore various configuration and security settings.
The following table describes the ways to perform a basic reset. You can reset a phone with any of these
operations after the phone has started up. Choose the operation that is appropriate for your situation.
Table 1: Basic Reset Methods
ExplanationActionOperation
Resets any user and network setup
changes that you have made, but
that the phone has not written to its
Flash memory, to previously saved
settings, then restarts the phone.
Press Applications . Go to
Adminsettings>Resetsettings>
Reset device.
Restart phone
Resets user and network setup
settings to their default values, and
restarts the phone.
To reset settings, press
Applications and choose
Administrator Settings >Reset
Settings >Network.
Reset settings
Resets the CTL file.To reset the CTL file, press
Applications and choose
Administrator Settings >Reset
Settings >Security.
Maintenance
1
Reset the Phone to the Factory Settings from the Phone Keypad
You can reset the phone to the factory settings. The reset clears all the phone parameters.
Procedure
Step 1 Remove power from the phone in one of these ways:
• Unplug the power adapter.
• Unplug the LAN cable.
Step 2 Wait 5 seconds.
Step 3 Press and hold #and plug the phone back in.
Step 4 When the Headset and Speaker buttons are lit, release #and enter the following key sequence:
123456789*0#
The light for the Headset button turns off after you press the 1key. After you enter the key sequence, the
Mute button lights.
Do not power down the phone until it completes the factory reset process, and the main screen
appears.
Caution
The phone resets.
Perform Reset All Settings from Phone Menu
Perform this task if you want to reset your user and network setup settings to the default values.
Procedure
Step 1 Press Applications .
Step 2 Choose Administrator settings >Reset settings >All settings.
If necessary, unlock the phone options.
Related Topics
Apply a Phone Password
Reboot Your Phone from the Backup Image
Your Cisco IP Phone has a second, backup image that allows you to recover the phone when the default image
has been compromised.
To reboot your phone from the backup image, perform the following procedure.
Maintenance
2
Maintenance
Reset the Phone to the Factory Settings from the Phone Keypad
Procedure
Step 1 Disconnect the power supply.
Step 2 Press and hold the star (*) key.
Step 3 Reconnect the power. Continue pressing the star key until the Mute LED turns off.
Step 4 Release the star key.
The phone reboots from the backup image.
Perform Network Configuration Reset
Resets network configuration settings to their default values and resets the phone. This method causes DHCP
to reconfigure the IP address of the phone.
Procedure
Step 1 From the Administrator Settings menu, if required, unlock phone options.
Step 2 Choose Reset Settings >Network Setup.
Related Topics
Apply a Phone Password
Perform User Network Configuration Reset
Resets any user and network configuration changes that you have made, but that the phone has not written to
flash memory, to previously saved settings.
Procedure
Step 1 From the Administrator Settings menu, if required, unlock phone options.
Step 2 Choose Reset Settings >Reset Device.
Related Topics
Apply a Phone Password
Remove CTL File
Deletes only the CTL file from the phone.
Maintenance
3
Maintenance
Perform Network Configuration Reset
Procedure
Step 1 From the Administrator Settings menu, if required, unlock phone options.
Step 2 Choose Reset Settings >Security Settings.
Related Topics
Apply a Phone Password
Quality Report Tool
The Quality Report Tool (QRT) is a voice quality and general problem-reporting tool for the Cisco IP Phone.
The QRT feature is installed as part of Cisco Unified Communications Manager installation.
You can configure user Cisco IP Phones with QRT. When you do so, users can report problems with phone
calls by pressing Report Quality. This softkey or button is available only when the Cisco IP Phone is in the
Connected, Connected Conference, Connected Transfer, or OnHook states.
When a user presses Report Quality, a list of problem categories appears. The user selects the appropriate
problem category, and this feedback is logged in an XML file. Actual information that is logged depends on
the user selection and whether the destination device is a Cisco IP Phone.
For more information about using QRT, see the documentation for your particular Cisco Unified
Communications Manager release.
Related Topics
Cisco Unified Communications Manager Documentation
Voice Quality Monitoring
To measure the voice quality of calls that are sent and received within the network, Cisco IP Phones use these
statistical metrics that are based on concealment events. The DSP plays concealment frames to mask frame
loss in the voice packet stream.
• Concealment Ratio metrics—Show the ratio of concealment frames over total speech frames. An interval
conceal ratio is calculated every 3 seconds.
• Concealed Second metrics—Show the number of seconds in which the DSP plays concealment frames
due to lost frames. A severely “concealed second” is a second in which the DSP plays more than five
percent concealment frames.
Concealment ratio and concealment seconds are primary measurements based on frame loss. A Conceal Ratio
of zero indicates that the IP network is delivering frames and packets on time with no loss.
Note
You can access voice quality metrics from the Cisco IP Phone using the Call Statistics screen or remotely by
using Streaming Statistics.
Maintenance
4
Maintenance
Quality Report Tool
Voice Quality Troubleshooting Tips
When you observe significant and persistent changes to metrics, use the following table for general
troubleshooting information.
Table 2: Changes to Voice Quality Metrics
ConditionMetric Change
Network impairment from packet loss or high jitter.Conceal Ratio and Conceal Seconds increase
significantly
• Noise or distortion in the audio channel such as
echo or audio levels.
• Tandem calls that undergo multiple
encode/decode such as calls to a cellular network
or calling card network.
•Acoustic problems coming from a speakerphone,
handsfree cellular phone or wireless headset.
Check packet transmit (TxCnt) and packet receive
(RxCnt) counters to verify that voice packets are
flowing.
Conceal Ratio is near or at zero, but the voice quality
is poor.
Network impairment from packet loss or high jitter
levels:
• Average MOS LQK decreases may indicate
widespread and uniform impairment.
• Individual MOS LQK decreases may indicate
bursty impairment.
Cross-check the conceal ratio and conceal seconds
for evidence of packet loss and jitter.
MOS LQK scores decrease significantly
• Check to see if the phone is using a different
codec than expected (RxType and TxType).
• Check to see if the MOS LQK version changed
after a firmware upgrade.
MOS LQK scores increase significantly
Voice quality metrics do not account for noise or distortion, only frame loss.
Note
Cisco IP Phone Cleaning
To clean your Cisco IP Phone, use only a dry soft cloth to gently wipe the phone and the phone screen. Do
not apply liquids or powders directly to the phone. As with all non-weatherproof electronics, liquids and
powders can damage the components and cause failures.
Maintenance
5
Maintenance
Voice Quality Troubleshooting Tips
When the phone is in sleep mode, the screen is blank and the Select button is not lit. When the phone is in
this condition, you can clean the screen, as long as you know that the phone will remain asleep until after you
finish cleaning.
Maintenance
6
Maintenance
Cisco IP Phone Cleaning
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47
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