Is it possible to have projector that has a phone for presentations meeting rooms be moved to Ring Central portal

I am not sure what are you asking for. But I guess this is a user type of question.

Let me move your question to the User community.

Is the projector phone SIP-capable? What's the model number/make of the unit?

Almost any SIP capable phone can be added in - most likely manually - if you have access to the projector GUI. (assumption is it can connect to your network)