Additional Firewall Issues
Internet Location Servers do not address two other issues with using NetMeeting behind a firewall. First, although a participant can join the directory from an external IP address, the participant cannot join a meeting unless the internal host manually adds the participant to the meeting from the directory. Second, while this approach is fine for data conferencing, audio or video conferencing requires opening of a wide range of ports on the firewall. In this case, it may be desirable to use a gateway.
Read more about this topic: Internet Locator Server
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