Cisco 7800 Series Administration Manual page 194

Voice Quality Monitoring
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.
Step 4
When the phone boots up, the headset button, the speaker button, and the mute button light up. When the light
on the Mute button turns off, press 123456789*0# in sequence.
When you press 1, the lights on the headset button turns off. The light on the Select button flashes when a
button is pressed.
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.
Caution
Perform Factory Reset from Phone Menu
Procedure
Step 1
Press Applications
Step 2 Scroll to Admin Settings and select Factory Reset.
Step 3 To restore phone configuration or settings to factory default, press Ok.
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
• Concealed Second metrics: Show the number of seconds in which the DSP plays concealment frames
Cisco IP Phone 7800 Series for Third-Party Call Control Administration Guide
180
Do not power down the phone until it completes the factory reset process, and the main screen
appears.
.
conceal ratio is calculated every 3 seconds.
due to lost frames. A severely "concealed second" is a second in which the DSP plays more than five
percent concealment frames.