Procedure
Step 1
From the
Administrator Settings
menu, if required, unlock phone options.
Step 2
Choose
Reset Settings
>
Network Settings
.
Related Topics
Apply a Phone Password, on page 31
Remove CTL File
Deletes only the CTL file from the phone.
Procedure
Step 1
From the
Admin Settings
menu, if required, unlock phone options.
Step 2
Choose
Reset Settings
>
Security
.
Related Topics
Apply a Phone Password, on page 31
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.
Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0 (SCCP
and SIP)
189
Voice Quality Monitoring