Sharing Internet Connection via Ethernet from Wi-Fi

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http://askubuntu.com – I have a VoIP box with an ethernet port that needs to have an internet connection, and a laptop with Wi-Fi that can already go online. I need to somehow "bridge" (don't know if I used this term correctly) these two interfaces together so my VoIP box works. I have already used the Network Manager in Ubuntu 11.10 and set "eth0" to "Share to other computers" but the VoIP box is getting no internet at all. I tested the ethernet connection with my dad's laptop and it proves that this "Share to other computers" thing is garbage. I will accept any comments and answers, and I appreciate them as well. (HowTos)