Although the OBi is quite capable of passing CallerID as you want and as it's documented to do, Obihai has intentionally withheld this capability in order to offer it as an enhanced feature on future products.
Thanks RonR. Do you think it's worth it to put in a feature request for this?
*sigh* I guess it'll be just like the >2 Service Providers which seem to be part of their ObiPlus offering; which is a bit too much for what I'm looking for.
While I don't mind paying a one time fee for an enhanced feature set, I don't want to have to pay a recurring subscription fee.