Jitter and Typical Voice Quality Symptoms
Posted: May 2nd, 2012 | Author: Matthew Berry | Filed under: Blog | 2 Comments »The last post generating some buzz on Twitter so I’m going to follow it up with one more.
The command “show call active voice brief” is an engineer’s best friend when it comes to confirming jitter and other call quality issues.
Here is a sample output of the command:
GapFillWithSilence=950 ms
GapFillWithPrediction=1980 ms
GapFillWithInterpolation=0 ms
GapFillWithRedundancy=0 ms
HiWaterPlayoutDelay=350 ms
LoWaterPlayoutDelay=25 ms
ReceiveDelay=29 ms
LostPackets=0
EarlyPackets=0
LatePackets=83
If you see the following values incrementing at a high rate, then you likely have an issue:
- GapFillWithSilence = Choppy voice issues
- GapFillWithPrediction = Synthetic voice issues
- LatePackets = Jitter
Hi Matthew
The fields that you explain aren’t displayed in “show call active voice brief” are displayed in “show call active voice”
Awesome. Thank you for the knowledge, Guru!