Microsoft has some pretty good documentation on how to do this. I recommend starting with Using Microsoft Exchange 2000 Conferencing Server over the Internet. Next, I would review How to Configure Exchange 2000 Conferencing Server and ISA Server to allow audio and video. You might also have a look at How to configure Exchange 2000 Conferencing Server for Internet attendees and Poor quality video in multicast conference over low bandwidth connection for additional information, as well.
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