Voice Port settings to minimize VOIP Echo

Discussion in 'Cisco' started by TexasMirty@gmail.com, May 18, 2006.

  1. Guest

    We are trying to fine-tune our voice port to minimize echo on our VOIP
    phones. Cisco techs
    have been working with us, but it seems to come down to trial and
    error. We have a Cisco 2851 router running CME (CallManager Express).

    These are settings we have tried and the results. Any audio engineers
    out there care to venture a suggestion? Thank you.

    Input Gain Output Attenuation Result
    -3......................3.....................Echo, loud and delayed
    -4......................4.....................Improved, some echo
    -5..................... 6.....................Worse, more echo
    -4......................5.....................Improved, still some echo

    Current Voice Port Echo settings:

    In Gain is Set to -4 dB
    Out Attenuation is Set to 5 dB
    Echo Cancellation is enabled
    Echo Cancellation NLP mute is disabled
    Echo Cancellation NLP threshold is -21 dB
    Echo Cancel Coverage is set to 64 ms
    Echo Cancel worst case ERL is set to 6 dB
     
    , May 18, 2006
    #1
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