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<font face="Helvetica, Arial, sans-serif">Gareth,<br>
<br>
multiple users/SIP-accounts use this asterisk server from many
locations. Like I said: in another location with a similar setup, there
are no echo-complaints on received or made calls.<br>
<br>
If you say that it has nothing to do with the Cisco-router, I don't
really know what to go looking for...<br>
<br>
I will take your advise and try with a SIP-phone </font><font
face="Helvetica, Arial, sans-serif">(snom 320)</font><font
face="Helvetica, Arial, sans-serif">.<br>
<br>
What do I do if : <br>
<br>
1. I also have echo with a SIP-phone ?<br>
2. I do not have echo with a SIP-phone ?<br>
<br>
<br>
Jonas.<br>
<br>
</font><br>
On 06/30/2010 03:52 PM, Gareth Blades wrote:<br>
<blockquote cite="mid:4C2B4C1A.6010503@skycomuk.com" type="cite">
<pre wrap="">Thats where I believe the problem lies. You are sending audio to them
and they are putting it onto the PSTN network. When the audio comes back
from the PSTN it has echo on it. They are not performing echo cancellation.
If it is an international call from the ITSP's perspective then teh
network operator should be performing echo cancelation anyway. If its a
national call then the telco doesnt perform echo cancelation but the
ITSP should do it themselves. The only time this is not needed is if the
phones have a very low delay to the ITSP but since this is normally not
the case echo cancelation must be performed at this point.
</pre>
</blockquote>
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