gnugk behind NAT ADSL modem

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Hi, all
I have the following setup:
                                                         eth0:192.168.1.234
EP1--------------------------------------------------GNUGK
192.168.1.11                                       eth1:192.168.5.2               
                                                           |
                                                           |
                                                           |
                                                          eth0:192.168.5.1
                                                       ADSL
                                                          eth1:A.B.C.D
                                                           |
                                                           |
                                                           |
                                                         CiscoGW

                                         
GnuGk is behind ADSL NAT, w hich is doing full port forwarding. When EP1 calls CiscoGW everything is fine, but when GW tries to call EP1 there is one way voice. In the debug logs of cisco i see the following:

RemoteIPAddress=A.B.C.D
RemoteUDPPort=5018
RemoteSignallingIPAddress=A.B.C.D
RemoteSignallingPort=1720
RemoteMediaIPAddress=192.168.5.2
RemoteMediaPort=5018

In gk.ini I saw there is NetworkInterfaces which states:
"Specify the network interfaces of the gatekeeper. By default the gatekeeper will detect the interfaces of your host automatically. There are two situations that you may want to use this option. One is automatical detection failed, another is the gatekeeper is behind an NAT box and allow endpoints with public IPs to register with. In this case you should set the option just as the gatekeeper is running on the NAT box."
So I tried to set NetworkInterfaces=A.B.C.D/32 but the same thing happens..
This is my gk.ini file:

[Gatekeeper::Main]
Fourtytwo=42
Name=blabla
TimeToLive=300
TotalBandwidth=100000

[RoutedMode]
GKRouted=1
H245Routed=1
CallSignalPort=1720
CallSignalHandlerNumber=2
RemoveH245AddressOnTunneling=1
AcceptNeighborsCalls=1
AcceptUnregisteredCalls=1
SupportNATedEndpoints=1
DropCallsByReleaseComplete=1
SendReleaseCompleteOnDRQ=1
ForwardOnFacility=1
ShowForwarderNumber=0
H245PortRange=2000-4000

[Proxy]
Enable=1
InternalNetwork=192.168.1.0/24
RTPPortRange=5000-59999
ProxyForNAT=1



Please tell me what i'm doing wrong?

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