asterisk users - Sep 2004 - Analog -> ip sip softphone on Fritz Capi - strong reverb ?

Hi,

I have problems that seems to be common when communicate from analog phone
to digital (ISDN). I have ISDN passive card Fritz and would kindly ask for
following info:

- are there any settings that can limit reverb ?
- are there any more info about capi.conf parameters and how to use in
Asterisk and setup CAPI device properly ?

Thanks in advance,

Robert.