Dear all, Have anybody uses speex codec over 56.6K bit/s line that hear clearly in both direction before? I perform a testing with one side using 56.6K dialup modem and the other side using broadband. The user that uses 56.6K/s modem is able to hear the broadband user voice. But the broadband uses hardly understand 56.6K/s modem user's voice. I am using 16KHz encoding. I am not sure if the the modem is half or full duplex. Of course, there is nothing wrong Speex but I am just wondering what is the mimimal bandwidth requirement for speex under 8KHz and 16KHz? So far, I have enabled VBR and DTX. What more should I do to optimize the bandwidth utilization? Is Speex codec design with 56.6Kb/s bandwidth consideration? It seems to me that the amount of bandwidth utilization for 8KHz and 16KHz is almost the same after compression, is this normal? Thanks, YueWeng __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com