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Internet phohe call from the masqueraded network



Hello,

I've got a program for Internet telephony named SpeekFreely. While it does work
on stand-alone machine connected to the ISP, it doesn't work properly when I
trying to connect to a foreing host (host F) from a host inside the masqueraded
network (host M).

1. M calls F - I get a connection, but the sound flows only in one direction -
from B to A.

2. F calls M - nothing happens on B.

It seems to be working the 2072 UDP (and may be TCP) port. I've tried to
configure port forwarding and fwmark-forwarding, I've read the man's and
HOWTO's, but with the same result :( 
Here is my firewall ruleset (without any tricks with portfw and mfw):

myhost# ipchains -L

Chain input (policy ACCEPT):
Chain forward (policy DENY):
target      prot opt       source          destination       ports
MASQ        all  --------- localnet/24     anywhere          n/a
Chain output (policy ACCEPT):

I wold be very grateful to anyone who can give an example of _working_ ruleset
for firewall/masquerading that allows direct connections between  foreign and
masqueraded hosts.

Best regards,
Kostya