Echo heard by others in VOIP application with USB Extigy HELP!

>Echo heard by others in VOIP application with USB Extigy HELP!x I have a soundblaster Extigy... the external USB model. It has been working fine for me but I just discovered a problem when I tried to use it during a Video/VOIP application.
I can get the other party up in the video session and I can hear them perfectly. They can hear me perfectly. The problem comes in when they speak.
When the other party talks they hear a huge eo on their end. I don't have an echo when I speak or listen.
We tried various things. When I disconnect my mic from my soundblaster and use the mic on my camera the other party does not have an echo when THEY speak any longer.
What is even more strange is that if I open Skype and engage in a skype conversation the person in the OTHER VOIP/VIDEO application can not only hear what is going on in that one, BUT when they speak the person in my skype conversation hears it! This is when the other party does not even have skype.
There is something definately going on with my soundblaster that is causing the other party to have an echo on THEIR end.
Any help would be greatly approeciated.
BTW... I'm running windows XP Pro.

A Thanks for the help, we'll try that. We are using a D-LinkDGL-400 Router with th D-LinkModel DGS-2208 switch. The program we are trying to run is OpenMeetings (an open source application) that we are hoping to get up and running so non-profit organizations have a free place to collaborate (http://www.caihq.org:5080/openmeetings/
What makes this strange is that when I use the Creative Orbit Camera I have with the built-in Mic not running through the Extigy there is no echo but the background noise is a bit of a hassle.
I'll try all you said and post the results.
Thanks again for the help.
Bob

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