Ok Steve. I will follow these instructions until i get some results. <br><br>The next time, I will consider buy a hardware with echo canceller ;)<br><br><div class="gmail_quote">On Tue, Nov 24, 2009 at 12:05 PM, Steve Howes <span dir="ltr"><<a href="mailto:steve-lists@geekinter.net">steve-lists@geekinter.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im"><br>
On 24 Nov 2009, at 13:48, jefferson alexandre wrote:<br>
> Steve, the hardware don't have echo cancellation.<br>
<br>
</div>Thats probably it.... You're relying on Asterisks software echo<br>
canceling.... I have seen mixed results. Have you tried adjusting<br>
gains? I'd do the following<br>
<br>
1. Turn off echo canceler (makes it more obvious whilst you're trying<br>
to remove it)<br>
2. Turn down both gains<br>
3. listening' inside your network (i.e. listening to audio coming to<br>
your network from the PSTN), adjust the gain upwards until it sounds<br>
suitable<br>
4. 'listening' outside of your network (i.e. listening to audio coming<br>
from your network to PSTN) do the same.<br>
5. Test for echo. Adjust the gains down for the sound you hear back<br>
(i.e. if you hear person inside your network echoing, adjust the gain<br>
in '4').<br>
6. Try and get it as close to echo free as you can using this method<br>
7. Enable any echo canceling you can find to 'tidy up' the leftover<br>
echo, try various ones if you need to. <a href="http://voip-info.org/wiki" target="_blank">voip-info.org/wiki</a> may help<br>
8. Buy hardware echo cancelers next time ;)<br>
<div><div></div><div class="h5"><br>
S<br>
<br></div></div></blockquote></div>