Taoman,
I'm not sure what to suggest to advance your application. I guess you could always say OK OBi you win and accomplish your application using OBiTalk.
The application works for others and myself. It's hard to know what is stopping it for you.
In narrowing down the problem, if you could call the OBi202 by direct ip calling from some other device over your local network and that works you could infer it is something to do with the OBi110. If you can't it probably has to do with your router or the OBi202 itself. If you have some other device to make sip uri calls you could use that on your local network to see if the problem is isolated to sending from the OBi. An old Linksys adapter, an Android Smartphone using CSipSimple, a softphone that allows calling without registration such as XLite.