hi! i am using asterisk 1.2beta1 and moved to beta2 and still am having echo when calling to a pstn line. am using tdm04b, centos 4.2, and a dell poweredge sc1425 machine. anyone who can help me config my zapata file or whatever that is that’s bugging the whole system. thanks in advance! 
Did you enable the ‘new’ echo canceller in zconfig.h?