video problem with gnugk via Intenet

 Hi all,
I have configured gnugk 3.8 and it works fine in local network (internal user1 call user2) and in combination with openmcu.When i have user1 on Internet (behind a Gateway) and user2 in local network, the internet user1 don't received video while user1 receive the video of user1.
My configuration:
- gnugk on virtual interface eth0:0 --192.168.1.3- asterisk (freepbx) on interface eth0 -- 192.168.1.2 (service stop)- openmcu on virtual interface eth0:1 --192.168.1.4 (service stop)- Gateway: 192.168.1.1- config gngk :
[Gatekeeper::Main]
Name=GnuGk
TimeToLive=600
Fortytwo=42
Home=192.168.1.3
Bind=192.168.1.3
ExternalIP=domain.internet
ExternalIsDynamic=1
[RoutedMode]
GKRouted=1
H245Routed=0
CallSignalPort=1721
AcceptUnregisteredCalls=1
RemoveH245AddressOnTunneling=1
;DisableH245Tunneling=1
;H245TunnelingTranslation=1
SupportNATedEndpoints=1
H245PortRange=31000-31999
Q931PortRange=30000-30999
DropCallsByReleaseComplete=1
;SendReleaseCompleteOnDRQ=1
[Proxy]
Enable=1
InternalNetwork=192.168.1.0/24
T120PortRange=50001-59999
RTPPortRange=50001-59999
;[ModeSelection]
;127.0.0.0/24=ROUTED
;192.168.1.0/24=PROXY,H245ROUTED
[GkStatus::Auth]
rule=allow;127.0.0.1=allow
;192.168.1.122=allow
[LogFile]
Rotate=Daily
RotateTime=23:00
Filename=/var/log/gnugk.log
[RasSrv::PermanentEndpoints]
192.168.1.2=asterisk;2
192.168.1.4=MCU;4
[EP::asterisk]
Capacity=60
[RasSrv::GWPrefixes]
asterisk=2
[RasSrv::ARQFeatures]
;CallUnregisteredEndpoints=1
;ArjReasonRouteCallToGatekeeper=0[RasSrv::RRQFeatures]
SupportDynamicIP=1[Gatekeeper::Auth]
SimplePasswordAuth=alternative;RRQ
AliasAuth=sufficient;RRQ
[SimplePasswordAuth]
3002=/okbYPopY6M=
3003=j3PFrME52BY=
MCU=0XDoYhVDTl0F2VXmjEY8gA==
I attached the trace file. 
Thanks