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To enable voice and video communications with Windows Messenger through a non-UPnP firewall, configure the firewall to allow incoming traffic on UDP ports 5004 – 65535.
For other purposes, enable the following ports:
• File Transfer: 6891 (to allow 10 simultaneous file transfers, open ports 6891–6900)
• Application and Whiteboard Sharing: 1503
• Remote Assistance: 3389
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