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The Tandberg units, from when I used them, could do 3-way conversations natively, and they sold an appliance that would do 4 or more. Additionally, IIRC I set up a Open323 gateway (gatekeeper? http://www.gnugk.org/) that did 4 - it would catch all 4 streams, combine them into one window, and rebroadcast that window. Heavier bandwidth, but potentially what you need.

Gnu Gatekeeper can do the job to you; it can be used like a traditional gatekeeper or like a proxy also; from FAQ:

"1.2. Can I use the GNU Gatekeeper for NAT/masquerading H323 calls through a firewall ?
Use the proxy function that has been introduced in version 2.0."

from manual:

"When Gatekeeper Routed call signalling is used, the gatekeeper may choose whether to route the H.245 control channel and logical channels.

Case I.

The gatekeeper doesn't route them. The H.245 control channel and logical channels are established directly between the endpoints.

Case II.

The H.245 control channel is routed between the endpoints through the gatekeeper, while the logical channels are established directly between the endpoints.

Case III.

The gatekeeper routes the H.245 control channel, as well as all logical channels, including RTP/RTCP for audio and video, and T.120 channel for data. In this case, no traffic is passed directly between the endpoints. This is usually called an H.323 Proxy, which can be regarded as an H.323-H.323 gateway. "

http://www.gnugk.org/

Just use the GNU Gatekeeper as a proxy for your firewall or NATed network.

It's freely available on *iX, Windows and Mac.

I forgot the URL: www.gnugk.org

I took a gander at his Speak Freely website to check out the reason behind his dropping maintenance to Speak Freely.

It mostly revolves around his contention that NAT'd LANs block peer to peer traffic. However, while he does concede that you can do port mapping to overcome this issue, he doesn't give people credence to make it work.

I have to call bullshit on this one; all you need to do is set up your network with static IPs on all of your machines, and then set up your firewall to pass traffic to specific machines based on functionality.

If you really need connectivity for multiple machines on your network, why not go to a VOIP (H.323) solution? This way call routing can take place inside of your network regardless of NAT.

I think he is just using this as an excuse to give up, and while I have no right to say he can't give up, I certainly can say his excuse is very lame.

If you are having problems with NAT, you can install the GNU Gatekeeper on your firewall to tunnel your H.323 connections through.

Then you should also mention the GNU Gatekeeper to manage VOIP networks with Gnomemeeting and other H.323 clients and gateways. Its GPL and runs on Unix and Windows.

If you are using H.323, get the GNU Gatekeeper, also known as OpenH323 Gatekeeper.