[GnomeMeeting-list] no audio at all

[jamesXu <jamesxu thizlinux com cn>]

Dear all:
I have such problems:
A: gnugk 2.2.0, Debian/Linux
B: gnomemeeting 1.0.2 Debian/Linux 192.168.0.138/24
C: gnomemeeting 1.0.2 Debian/Linux 192.168.0.192/24

when A, B, C are in the same LAN, B can make calls to C through A
sucessfully. But when A is in internet, B and C in the same LAN, C can
receive B's call, but there is no audio at all.
any ideas?
this is the config file of gatekeeper.ini: and i run my gk with command
: gnugk -r/ gnugk -rr/, both tried. the same result, no audio ;-(.
[Gatekeeper::Main]
Fourtytwo=42
Name=OpenH323GK
;EndpointSignalPort=1000
;NetworkInterfaces=192.168.1.57/24,211.154.174.57/0

[RoutedMode]
GKRouted=1
H245Routed=1
AcceptUnregisteredCalls=1
SupportNATedEndpoints=1
;CallSignalPort=0
;H245PortRange=30000-30010
;Q931PortRange=30011-30020

[RasSrv::ARQFeatures]
CallUnregisteredEndpoints=1

[Proxy]
Enable=1
;RTPPortRange=5000-5010
InternalNetwork=192.168.0.0/24
ProxyForNAT=1

[GkStatus::Auth]
rule=allow

[Gatekeeper::Auth]
default=allow

begin:vcard
fn:james Xu
n:Xu;james
email;internet:jamesxu thizlinux com cn
version:2.1
end:vcard