[Asterisk-Users] Reduce echo?

[Patrick]

Hi,

Just installed Asterisk+samples from yesterday's cvs with an ISDN card
(passive, Cologne HFC chipset, HiSax driver). When I leave a voicemail
for extension 1234 the echo is horrible. Is there a way to reduce the
echo in this setup? 

Probably buying a decent card like an Eicon Diva PCI and use chan_capi
drivers with echo_cancellation=on would improve things but I do not have
that card right now :)

Thanks,
Patrick