Cisco 8832 Guía
Maintenance
•Basic Reset, on page 1
•Voice Quality Monitoring, on page 4
•Voice Quality Reporting, on page 5
•Cisco IP Phone Cleaning, on page 7
•View Phone Information, on page 7
•Reboot Reasons, on page 7
Basic Reset
Performing a basic reset of a Cisco IP Phone provides a way to recover when the phone experiences an error.
The reset provides a way to reset or restore various configuration and security settings.
When you set up emergency calls, the phone requests an updated location whenever a person performs a
phone restart.
Note
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 applicable for your situation.
Table 1: Basic Reset Methods
ExplanationActionOperation
Resets any user and network setup
changes that you have made, to the
previously saved settings that the
phone has not written to its flash
memory. The phone then restarts.
Restart phone
Restores the phone configuration
or settings to factory default.
Reset settings
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When an administrator has set up emergency calls, the phone requests an updated location whenever the
administrator does the following actions:
• Registers the phone with the call server.
• Restarts the phone (phone is registered).
• Changes the network interface that is used for the SIP registration.
• Changes the IP address of the phone.
Note
Perform a Factory Reset with the Phone Keypad
Use these steps to reset the phone to factory default settings using the phone keypad.
Procedure
Step 1 Unplug the phone:
• If using PoE, unplug the LAN cable.
• If using the power cube, unplug the power cube.
Step 2 Wait 5 seconds.
Step 3 Press and hold #and plug the phone back in.
When the phone boots up, the light on the mute button lights up.
Step 4 Press the 123456789*0# keys in sequence.
When you press a key, the light on the mute button flashes.
After you press these buttons, the phone goes through the factory reset process.
If you press the buttons out of sequence, the phone powers on normally.
Do not power down the phone until it completes the factory reset process, and the main screen appears.
Caution
Perform Factory Reset from Phone Menu
Procedure
Step 1 Press Settings.
Step 2 Select Device administration >Factory reset.
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Perform a Factory Reset with the Phone Keypad
Step 3 To restore phone configuration or settings to factory default, press OK.
Factory Reset the Phone from Phone Web Page
You can restore your phone to its original manufacturer settings from the phone web page. After you reset
the phone, you can reconfigure it.
Procedure
Reset your phone from the phone web page from one of the methods:
• Enter the URL in a supported web browser and click Confirm Factory Reset.
You can enter URL in the format:
http://<Phone IP>/admin/factory-reset
where:
Phone IP = actual IP address of your phone.
/admin = path to access admin page of your phone.
factory-reset = command that you need to enter in the phone web page to factory-reset your phone.
• On the phone web page, select Admin Login >Advanced >Info >Debug Info.Click Factory Reset
in the Factory Reset section and confirm the factory reset message in the next screen. Click Submit All
Changes.
Identify Phone Issues with a URL in the Phone Web Page
When the phone doesn't work or doesn't register, a network error or any misconfiguration might be the cause.
To identify the cause, add a specific IP address or a domain name to the phone admin page. Then, try to access
so that the phone can ping the destination and display the cause.
Procedure
In a supported web browser, enter a URL that consists of your phone IP address and the destination IP that
you want to ping. Enter the URL using the format:
http:/<Phone IP>/admin/ping?<ping destination>, where:
<Phone IP> = actual IP address of your phone.
/admin = path to the access admin page of your phone.
<ping destination> = any IP address or domain name that you want to ping.
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Factory Reset the Phone from Phone Web Page
The ping destination allows only alphanumeric characters, ‘-’, and “_” (underscores). Otherwise the phone
shows an error on the web page. If the <ping destination> includes spaces, the phone uses only the first part
of the address as the pinging destination.
For example, to ping the 192.168.1.1 address:
http://<Phone IP>/admin/ping?192.168.1.1
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.
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
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Voice Quality Monitoring
ConditionMetric Change
• 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
Voice Quality Reporting
You can capture voice quality metrics for Voice over Internet Protocol (VoIP) sessions with a Session Initiation
Protocol (SIP) event package. Voice call quality information derived from RTP and call information from
SIP is conveyed from a User Agent (UA) in a session (reporter) to a third party (collector).
The Cisco IP phone uses User Datagram Protocol (UDP) to send a SIP PUBLISH message to a collector
server.
Supported Scenarios for Voice Quality Reporting
Currently, only the basic call scenario supports voice quality reporting. A basic call can be a peer to peer
incoming or outgoing call. The phone supports periodic SIP publish message.
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Maintenance
Voice Quality Reporting
Mean Opinion Scores and Codecs
The voice quality metrics use Mean Opinion Score (MOS) to rate the quality. A MOS rating of 1 is the lowest
quality; a MOS rating of 5 is the highest quality. The following table gives a description of some of the codecs
and MOS scores. The phone supports all codecs. For all codecs, the phone sends the SIP Publish message.
Minimum Call Duration for
Valid MOS Value
MOSComplexity and DescriptionCodec
10 secondsA minimum value of 4.1 indicates good
voice quality.
Very low complexity.
Supports uncompressed 64
kbps digitized voice
transmission at one to ten 5
ms voice frames-per-packet.
This codec provides the
highest voice quality and
uses the most bandwidth of
any of the available codecs.
G.711
(A-law
and
u-law)
30 secondsA minimum value of 3.5 indicates good
voice quality.
Low to medium complexity.G.729A
30 secondsA minimum value of 3.5 indicates good
voice quality.
Contains the same reduced
complexity modifications
present in the G.729A.
G.729AB
Configure Voice Quality Reporting
You can enable voice quality reporting on the phone with the web interface. Each extension on a phone has
a separate voice quality report. For each extension on the phone, use the corresponding Voice Quality Report
Address field to configure the generation of voice quality report.
Procedure
Step 1 On the Phone Web page, select Admin Login >advanced >Voice >Ext x.
Where:
• Ext x = the extension number on the phone
Step 2 In SIP Settings, enter a value in the Voice Quality Report Address x field. You can enter either a domain
name or an IP address in this field.
You can also add a port number along with the domain name or an IP address in this field. If you do not enter
a port number, the value of the SIP UDP Port (5060) is used by default. If the collector server URL parameter
is blank, a SIP PUBLISH message is not sent out.
Step 3 Click Submit All Changes.
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Maintenance
Mean Opinion Scores and Codecs
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.
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.
View Phone Information
Procedure
To check the current status of the Cisco IP Phone, click the Info tab.
The Info tab shows information about all phone extensions, including phone statistics and the registration
status.
Reboot Reasons
The phone stores the most recent five reasons that the phone was refreshed or rebooted. When the phone is
reset to factory defaults, this information is deleted.
The following table describes the reboot and refresh reasons for the Cisco IP Phone.
DescriptionReason
The reboot was a result of an upgrade operation
(regardless whether the upgrade completed or failed).
Upgrade
The reboot was the result of changes made to
parameter values by using the IP phone screen or
phone web user interface, or as a result of
synchronization.
Provisioning
The reboot was triggered by a SIP request.SIP Triggered
The reboot was triggered as a result of remote
customization.
RC
The user manually triggered a cold reboot.User Triggered
The reboot was triggered after the phone IP address
changed.
IP Changed
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Maintenance
Cisco IP Phone Cleaning
You can view the reboot history as follows:
• From the phone web user interface
• From the IP phone screen
• From the phone Status Dump file (http://phoneIP/status.xml or http://phoneIP/admin/status.xml)
Reboot History on the Phone Web User Interface
On the Info >System Status page, the Reboot History section displays the device reboot history, the five
most recent reboot dates and times, and a reason for the reboot. Each field displays the reason for the reboot
and a time stamp that indicates when the reboot took place.
For example:
Reboot Reason 1: [08/13/14 06:12:38] User Triggered
Reboot Reason 2: [08/10/14 10:30:10] Provisioning
Reboot Reason 3: [08/10/14 10:28:20] Upgrade
The reboot history displays in reverse chronological order; the reason for the most recent reboot displays in
Reboot Reason 1.
Reboot History on the Cisco IP Phone Screen
Reboot History is located under Apps >Admin Settings >Status menu. In the Reboot History window, the
reboot entries displays in reverse chronological order, similar to the sequence that displays on the phone web
user interface.
Reboot History in the Status Dump File
The reboot history is stored in the Status Dump file (http://<phone_IP_address>/admin/status.xml).
In this file, tags Reboot_Reason_1 to Reboot_Reason_3 store the reboot history, as shown in this example:
<Reboot_History>
<Reboot_Reason_1>[08/10/14 14:03:43]Provisioning</Reboot_Reason_1>
<Reboot_Reason_2>[08/10/14 13:58:15]Provisioning</Reboot_Reason_2>
<Reboot_Reason_3>[08/10/14 12:08:58]Provisioning</Reboot_Reason_3>
<Reboot_Reason_4>
<Reboot_Reason_5>
<Reboot_History/>
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Maintenance
Reboot History on the Phone Web User Interface
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