Cisco 7975G - Unified IP Phone VoIP Rozwiązywanie problemów i konserwacja - Strona 24

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Cisco Unified IP Phone Cleaning

Table 5: Changes to Voice Quality Metrics

Metric change

MOS LQK scores decrease significantly

Conceal Ratio and Conceal Seconds increase

significantly

Conceal Ratio is near or at zero, but the voice quality

is poor.

Note

Voice quality metrics do not account for noise or distortion, only frame loss.

Cisco Unified IP Phone Cleaning

To clean your Cisco Unified IP phone, use a soft, dry cloth to wipe the phone screen. Do not apply liquids or

powders directly on the phone. As with all non-weather-proof electronics, liquids and powders can damage

the components and cause failures.

Disable the screen before cleaning it so that you will not inadvertently choose a feature from the pressure of

the cleaning cloth. To disable the screen, press Display for more than one second. The phone displays

Touchscreen Disabled or Phone Screen Disabled and the Display button flashes green.

After one minute, the screen automatically reenables itself. To reenable the screen before that, press the

flashing Display button for more than one second. The phone displays Touchscreen Enabled or Phone

Screen Enabled.

Troubleshooting and Maintenance

Condition

Network impairment from packet loss or high jitter:

• Average MOS LQK decreases could indicate

widespread and uniform impairment.

• Individual MOS LQK decreases indicate bursty

impairment.

Cross-check with Conceal Ratio and Conceal Seconds

for evidence of packet loss and jitter.

Check to see whether the phone is using a different

codec than expected (RxType and TxType).

Check to see whether the MOS LQK version changed

after a firmware upgrade.

• Network impairment from packet loss or high

jitter.

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.