Firewall Wizards mailing list archives
Re: Netmeeting Videoconferencing
From: Mark Brown <broonie () sirena org uk>
Date: Sat, 14 Jul 2001 13:21:20 +0100
On Fri, Jul 13, 2001 at 10:03:17AM +0200, Patrick M. Hausen wrote:
While Gauntlet provides a "netmeeting proxy" which is just a transparent TCP plug for a particular port, I think I remember Netmeeting using H.323 for audio/video.
If this is indeed the case (can someone confirm?), I'm
Yes, NetMeeting does use H.323 for this. I believe it also implements a number of other things that you might want to look at like desktop sharing.
data stream. And port numbers are selected dynamically in the same way ISDN devices pick TEIs - what a brain damaged protocol. :-(
That was kind of a design goal, I believe :-) . There does tend to be a degree of predictability in the ports which a given H.323 implementation will choose to use but I wouldn't want to rely on it.
Are there any open source H.323 proxies? I found some "gatekeeper" software, but according to my understanding gatekeepers only manage call setup. The audio/video
You're probably going to need to use a gatekeeper anyway so that the systems can find each other and so you can authenticate, particularly if you're trying to talk over disjoint networks in private IP space.
packets are exchanged directly between the two parties taking part in a call for delay reasons.
Generally, yes. However, part of the role of the gatekeeper is to provide additional services to endpoints that they do not implement for themselves. In order to allow it to do this the gatekeeper is able to intercept and rewrite all the call signalling messages. This allows them to do things like talk to firewalls and get them to open/close ports as and when needed or rewrite messages to redirect traffic in a manner that will get through a firewall (including pointing at a proxy). These things are all likely to need programming, though. The main free H.323 implementation I'm aware of is OpenH.323 (http://www.openh323.org) - someone mentioned a proxy derived from it. -- "You grabbed my hand and we fell into it, like a daydream - or a fever." _______________________________________________ firewall-wizards mailing list firewall-wizards () nfr com http://www.nfr.com/mailman/listinfo/firewall-wizards
Current thread:
- Netmeeting Videoconferencing Patrick M. Hausen (Jul 13)
- Re: Netmeeting Videoconferencing Josef Pojsl (Jul 13)
- Re: Netmeeting Videoconferencing Mark Brown (Jul 15)