NAT Problem, WAN to LAN works, LAN to WAN doesn't, , Help!!

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Hi,
     After trying all I could for 4 days, finally decided to post.. I
hav two polycom pvx softphones on either side of the NAT trying to
call each other.
The Gnugk is behind the NAT in the LAN and no Firewall rules are
present. The setup is as follows

[polycom pvx (1) on the
Internet]---------->NAT----------------------->[polycom pvx (2) on the
LAN]
                                                                  |
                                                                  |
                                                            GNUGK

The endpoints get registered and calls from  Internet to LAN gets
through. But calls from LAN (pvx 2) to Internet (pvx 1) fails!
The only error message i see in the log is something like this

"Q931d Could not open/connect Q.931 socket at10.100.106.183:30001 -
error 12/61:"

The Config file is this

[Gatekeeper::Main]
Fortytwo=42
TimeToLive=600
Home=10.100.106.183
ExternalIP=XXXX

[RoutedMode]
GKRouted=1
H245Routed=0
CallSignalPort=1720
RemoveH245AddressOnTunneling=1
DropCallsByReleaseComplete=1
SupportNATedEndpoints=1
Q931PortRange=30000-30999
H245PortRange=31000-31999

[Proxy]
Enable=1
T120PortRange=50000-59999
RTPPortRange=50000-59999
ProxyForNAT=1
ProxyForSameNAT=1
InternalNetwork=10.0.0.0/8

[GkStatus::Auth]
rule=allow

[RoutingPolicy]
default=internal
--

Can you please tell me what could be the problem and what else should be done?
Also I have done no configurations in the PVX softphone other than the
specifying the gatekeeper for
registration. Is there any more config to be done?

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