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sho voice call stat counters

Hello.  Im looking for info on what the ERL  and Jitter counters mean and how to relate them to any potential call quality problems.  I found the following, but not sure what it should be

 

ERL

Echo return loss (in dB).

ERL/Reflctr

Time difference, in ms, between the original signal and the loudest echo (peak reflector) as detected by the echo canceller.

Jitter

Current values of the delay and the jitter of the packets around that delay.

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