DANTE und ICQPhone

hi,
i am dealing with the following problem...

I'm using a Linux Proxy Server (RedHat 8.0) with iptables enabled and set up
a SOCKS proxy (DANTE 1.1.14) on it. Behind this proxy windows machines are
running in an internal network and like to use icqPhone. The SOCKS is
working properly if used with Netscape or so on, chat also works with icq.
But ICQ Phone does not work. Although the connection is being established
correctly ("Talking" is being shown) I cannot hear anything (Hardware
equipment is ok). Actually there doesn't seem to come any information back
from my conversation partner

I'm using xDSL as internet connection...
Does anybody know this problem? Does anybody have a properly working
socks.conf for DANTE and icqPhone?
Thanks for your help!
Regards,
Ingo