Suffit d'ouvrir certains ports selon tes besoins, par exemple la voix, la vidéo, la réception de fichiers ou la simple réception de messages
1838 : TCP MSN Messenger (Gamevoice)
1863 : TCP/UDP MSN Messenger primary (incoming)
5004 : UDP MSN Messenger, ports 5004-65535. Used for AUDIO and VIDEO. Caution: securty risc! Do not open ALL these ports!
5004 : UDP MSN messenger (dynamically uses a port in this range 5004 – 65535 - requires uPNP in your NAT router and/or firewall). Used for AUDIO and VIDEO. See Microsoft website for details.
5190 : UDP MSN Messenger (incoming)
6891 : TCP MSN Messenger Filetransfer (incoming) - ports 6891 - 6900, one port per file transfer
6901 : TCP/UDP MSN Messenger Voice Telephony (incoming)