asterisk users - Jun 2007 - Polycom echo problem

I have three polycom 501 that are all hearing echo. The other party sounds fine
but you can hear yourself rather well. The volume does help if lowered but that
also makes the other party extremely quiet. Is there any way to control the gain
of the mic or stop the microphone from picking up so much from the handset. It
only happens while you are on the handset.
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I had the same situation and I had to replace my T1 card with the one with
hardware echo canceller. All other solutions were failed. May be you need to
do the same if you're on a PRI or using PSTN lines. If you're on a pure
VoIP
network, then its the phones.

On 6/30/07, Jordan Novak <jnovak at logisticshealth.com>
wrote:
>
>
> I have three polycom 501 that are all hearing echo. The other party sounds
> fine but you can hear yourself rather well. The volume does help if lowered
> but that also makes the other party extremely quiet. Is there any way to
> control the gain of the mic or stop the microphone from picking up so much
> from the handset. It only happens while you are on the handset.
>
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-- 
Zeeshan A Zakaria
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At 15:43 6/30/2007, Jordan Novak wrote:
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>
>
>I have three polycom 501 that are all hearing echo. The other party 
>sounds fine but you can hear yourself rather well. The volume does 
>help if lowered but that also makes the other party extremely quiet. 
>Is there any way to control the gain of the mic or stop the 
>microphone from picking up so much from the handset. It only happens 
>while you are on the handset.

We had an echo problem a while back.  It was related to
a "sip.cfg" file I got from a tech at Polycom.  In it,
I changed these settings:

        <AEC voice.aec.hs.enable="1"
        <AES voice.aes.hs.enable="1"
        <NS voice.ns.hs.enable="1"

to these:

        <AEC voice.aec.hs.enable="0"
        <AES voice.aes.hs.enable="0"
        <NS voice.ns.hs.enable="0"

and the problem disappeared.  HTH.