Voice Chat

Microsoft IM audio and visual capabilities use dynamic ports, which is the bane of all firewall administrators. Microsoft recommends that you open UDP ports 5004 through 65535 on your firewall. This is something to think about carefully. Since the ports used are dynamic, you need to have the world have access to your hosts on these ports. If you are going to do this, cover your backside by having someone above you approve this. Anyway, if this is what you want to do, there's more info at the following link:

http://www.microsoft.com/WindowsXP/pro/techinfo/deployment/natfw/fwwinmes.asp#fwwinmes

Does the version of messenger you are using have the plugin for chatting? Did you go through the audio setup for the messenger service?

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