EDIT (February 5, 2011): If you had this working and then it stopped, or if you couldn’t get it to work, check the FreePBX trunk settings and in the USER Details make sure you have “nat=yes” and not “nat=never”. This article sort of assumes...
michigantelephone.wordpress.com/2011/01/30/review-of-the-obihai-obi110-voip-device-part-4-how-to-use-the-obi110-as-an-fxo-port-with-asterisk-and-freepbx/
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