[asterisk-users] Echo on Polycom phones

[Doug Lytle]

hin lee wrote:
> We are using Polycom 550 and 650 phones and OSLEC echo cancellation 
> software with Asterisk.  Occasionally, we get echo on our PRI phone 
> calls.  The echo is always from our voice echoing back to us.  How can 
> I fix this echo?  I have tried installing the VPMADT032 module on our 
> TE121 card, but that made it worse.
>
> rxgain=0.0
> txgain=0.0

Try reducing your transmit gains (txgain=-4.0

Doug

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