Well, if you read that linked discussion, which is actually linked to one previous to it, we also pointed out that an OBi will at least operate the attached telephone to use IVR prompts, without any configuration.
Why not try another phone and cord?
If you're going to replace the OBi, I recommend getting a model 200, as it is based on a more powerful SoC and can support 4 service providers and other new features.