It is possible for those running linux to communicate with other 
computers running Microsoft Netmeeting. This can be done by using 
OhPhone, which is one of the programs from the Open H.323 project 
(http://www.openh323.org).
I used this program a few weeks ago, to participate in the monthly 
meeting of my department, the UP College of Medicine Medical Informatics 
unit. I am studying for my MSc here in the UK, and needed to be able to 
voice conference with my co-faculty back there in the Philippines.
By installing OhPhone on my Mandrake 7.2 system, I could be contacted 
via Netmeeting 3.0 running on my colleague's computer. The sound quality 
was quite good, comparable to a long distance call. They could also send 
video, but the additional bandwidth impacted unfavorably on voice quality.
For those running a linux gateway using IP masquerade (to a DSL line or 
PPP line or cable modem), there is an ipmasq module that allows H.323 
connections to be masqueraded. This allows people using H.323 
teleconferencing software (like netmeeting) to be able to connect 
through your linux firewall/gateway. You can find the module source code 
at the URL below.

http://www.coritel.it/projects/sofia/nat.html

Cito

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Philippine Linux Users Group. Web site and archives at http://plug.linux.org.ph
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