Hi Can someone give a suggestion on what I should do to omit the echo. Here is may scenario --- h323 --- chan-ss7 --- A---| |--------| |--------------| |----B --- --- --- Nextone Asterisk DMS The calling party can hear every words he/she say after 1 to 2 seconds. But the called party can hear A with no echo and the quality is clear. I have already tried it in both digium (TE410P) and sangoma card (AT104) and the results where the same. Is there any way that I can cancel the echo? Any particular settings that I have to change in the settings of the asterisk? Thanks in advance Regards, Leonimar __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com