Unfortunately, that's set in Google's servers and you have no control over it, whether calling with an OBi or by other means.
Two providers that (as far as I've tested) consistently send the correct caller ID are Anveo and Voxbeam. The latter is less expensive but harder to use. Callcentric does it right in most cases, but to some countries, fail to send caller ID at all. What country are you calling? Landline or cellular?
