[ubuntu] bittorrent get past firewall

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http://ubuntuforums.org – When I try to bittorrent things at my house, it does not work. Our modem's firewall blocks the default bittorrent port, and my parents do not want me playing around with their modem. We are using a billion bipac 7404VNOX (http://au.billion.com/product/voip/bipac7404vnox.php). I would, however, assume that all billion modems have the same firewall settings by default. The firewall is set to "medium security level". Does anyone know how to get bittorrent to work on a port like port 8080, 80, 23, 1863, etc, which isn't blocked by the firewall? (Hardware)