asterisk users - Jan 2004 - GS Handytone Echo-problem

Hi,

Yesterday I finaly got my handytone sip adaptor. It works....

But when dialing to and from ISDN I got echo in both ends, I had tried diff. 
codecs, but then the GS wont work at all - It can do a call, but after 3 
'ring' it disconnect.

Any hints ?

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