H.460.18 occasionally exposes/tries to use Endpoints Internal Address

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So, further to my H.460 testing, I saw (via tcpdump) the GNUGK which is 
the H.460 registrar trying to communicate with the H.460 endpoint on 
it's Internal address on the firewall, and not the WAN IP I see under 
the registration.

Most of the time, almost all the traffic goes to the right IP address, 
but the occasional packet of a different channel (It's UDP, H.245?  
RAS?) leaks out and tries to go to the endpoints internal pre-NAT IP 
address.

Then, very occasionally, but I can repeat after several tries, all the 
media from the GNU/GK tries to go to the Internal pre-NAT IP address of 
the endpoint.

I'm not entirely sure what's going on, as the registration information 
is intact with the right outside IP, H.460.18 is indicated in the 
registration, and most calls just work. 

I'm using a slightly smarter firewall (ASA5500) than the average home 
user, but all the h323 inspections are turned off, so I don't think 
thats it.

All the packets are sourced from port 50xxx and are destined to the 
right port on the Endpoint (Tandberg 150MXP), just the wrong IP.

Has anyone else run into this?  Did I simply miss something in my 
configuration?  (Attached below).

Thanks and Best Regards
  Andrew

[Gatekeeper::Main]
Fortytwo=42
Name=GNUGK003
Home=127.0.0.1,10.10.10.10
Bind=127.0.0.1,10.10.10.10
TimeToLive=600
StatusPort=7000
StatusTraceLevel=1
UseBroadcastListener=0
CompareAliasType=1
CompareAliasCase=0
TimestampFormat=MySQL
TimeToLive=600

[LogFile]
Rotate=daily
RotateTime=00:00


[RoutedMode]
GKRouted=1
H245Routed=1
CallSignalPort=1720
CallSignalHandlerNumber=10
RtpHandlerNumber=4
AcceptNeighborsCalls=1
AcceptUnregisteredCalls=1
RemoveH245AddressOnTunneling=1
RemoveCallOnDRQ=0
DropCallsByReleaseComplete=1
SendReleaseCompleteOnDRQ=1
SupportNATedEndpoints=1
SupportCallingNATedEndpoints=0
TreatUnregisteredNAT=0
ForwardOnFacility=1
ShowForwarderNumber=0
Q931PortRange=20000-20999
H245PortRange=30000-30999
SetupTimeout=8000
SignalTimeout=30000
AlertingTimeout=60000
TcpKeepAlive=1
TranslateFacility=1
SocketCleanupTimeout=5000
EnableH46018=1
H46018NoNat=1


[Proxy]
Enable=1
ProxyAlways=0
InternalNetwork=10.0.0.0/8,66.0.0.0/20,127.0.0.0/8,65.0.0.0/24
T120PortRange=40000-49999
RTPPortRange=50000-59999
ProxyForNAT=1
ProxyForSameNAT=1
DisableH460Call=0
DisableRTPQueuing=1
EnableRTPMute=0

[RasSrv::LRQFeatures]
NeighborTimeout=2
SendRetries=2
ForwardHopCount=2
AcceptForwardedLRQ=1
ForwardResponse=1
ForwardLRQ=depends
AcceptNonNeighborLRQ=1
AcceptNonNeighborLCF=1


[RasSrv::RRQFeatures]
OverwriteEPOnSameAddress=1


[RoutingPolicy]
default=explicit,internal,neighbor,srv,dns


[RoutingPolicy::OnARQ]
default=explicit,internal,neighbor,srv,dns

[RoutingPolicy::OnLRQ]
default=explicit,internal,neighbor,srv,dns


[RoutingPolicy::OnSetup]
default=explicit,vqueue,internal,srv,dns

[GkStatus::Auth]
rule=allow

[RasSrv::RewriteE164]

[RasSrv::Neighbors]
GKLAB=Gnugk

[Neighbor::GKLAB]
Host=66.0.0.211
Dynamic=0
SendPrefixes=*
AcceptPrefixes=1999
ForwardHopCount=5
AcceptForwardedLRQ=1
ForwardResponse=1
ForwardLRQ=Depends


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