We have experienced echo problem for caller, but no echo problem for callee. Does anybody know what could be cause?
you need to give more details about the equipment and technologies you’re using. no crystal balls here.
also, have you searched the wiki for “echo” … there are lots of pages to read.
unfortunately, echo cancellation often feels like some black art. you experiment lots using others experiences as a starting point, and tweak until it’s right for you.