[asterisk-users] Echo Issue

[matt at mattgwatson.ca]

The Aastra 480i is also known for having pretty high sidetone volumes
which some may interpret as an echo.

These are the gain/sidetone settings I use on all my Aastra's (9112i,
9113i, 480i, and 57i)

headset tx gain: -3
headset sidetone gain: -2
handset tx gain: -6
handset sidetone gain: -5
handsfree tx gain: 0


You can probably safely ignore the headset settings unless you are
using headsets obviously... I've found those settings work fairly well
with Plantronics headsets (have a few different models in use using
those same settings).

Don;t know anything about the SNOM's so I can help ya there.

--
Matt
http://www.mattgwatson.ca

On 7/21/08, Noah Miller <noahisaacmiller at gmail.com> wrote:
> Hi Joseph -
>
>> I have Astra 480i's and Snom M3's. I am using a SIP provider so I do
>> not have any peripheral cards.
>>
>> I am on voip-wiki now reading about the echo canceller tuning, thanks!
>
> For your particular case, you're probably not going to find much
> useful info on the wiki about echo cancellation.  The info there is
> about reducing echo when there is an analog-to-digital conversion (in
> other words, if you're connecting to PSTN lines somewhere).
>
> If you have echo on calls that go through your SIP provider, it is
> possible that they are not doing a very good job with echo
> cancellation.  If the echo is exclusively on these calls, you'll
> probably want to call them to discuss this.
>
> If you have echo on calls between your Astra and/or Snom handsets, you
> may want check the gain settings on these devices.  Reducing the gain
> would probably lessen the effect of the echo.  You may also want to
> check if either of these phones is doing any AEC (acoustic echo
> cancellation), and if there are any AEC parameters that are
> adjustable.  I don't have experience with either of these phones, so I
> can't give you direct info on how to do this, but I'm sure that at
> least Snom support can help you.
>
>
> - Noah
>
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