I could really only find examples of this with the Centrafuse guys, but it seems they have been able to resolve it. I just got my Andrea Superbeam microphone array and installed mobilephone.net with my bluesoleil software. The person on the other end gets a bad echo, and I know why it's happening, but what have you guys done to fix your own problems or avoid it? It would be nice if Mobilephone.net could implement a half-duplex mode or something.