Proxying Calls Across the Internet

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Ok so here's my setup

machine1-----machine2
               |
           natbox1
               |
           internet------proxy (server running gnugk)
               |
           natbox2
               |
          machine3

natbox1,natbox2 and proxy have public internet IP addresses. machine1 and machine2 are on one private network behind natbox1, machine3 is on its own private network behind natbox2. My question is can I get gnugk running on 'proxy' to allow calls between any combinations of machine1, machine2, and machine 3?

I've got GnuGK up and running on 'proxy' and I've tried some testing between machine1 and machine2 (with netmeeting). They both seem to login to gnugk properly but when I try to make a call from machine1 to machine2 (or the other way round) it takes a few seconds then says 'The other party did not accept your call.' or something similar. I've sucessfully got this to work if I run GnuGK on a third machine within the private network behind natbox1 but as soon as I put it out on the internet it doesn't work.

Here's what I think are the important parts of my .ini incase I'm doing something really stupid:

[RoutedMode]
GKRouted=1
H245Routed=1
CallSignalPort=1721
CallSignalHandlerNumber=2
AcceptUnregisteredCalls=1
RemoveH245AddressOnTunneling=1
DropCallsByReleaseComplete=1
SupportNATedEndpoints=1
Q931PortRange=30000-30020
H245PortRange=40000-40020

[Proxy]
Enable=1
T120PortRange=50000-50100
RTPPortRange=50000-50100
ProxyForNAT=1
ProxyForSameNAT=0

(I've tried with various combinations of the nat settings and such but haven't come across anything better than this, I haven't messed with too much else because I'm not too sure whats needed for this particular situation.)

So questions are: Is this even possible? If so, am I doing something fundamentally wrong? If so, what do I do to fix it?

I have a suspicion this has been asked and answered before. If it has if someone would be so kind as to atleast send me some links to the appropriate mails in the archive that would be great as I wasn't able to find this particular situation looking myself.

Adam Wendt





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