My DX series devices (DX-650, 70, and 80) are working fine when registering directly to my publisher. But when I flip my CM Group to make them register to my subscriber node, they don't register. Phone display error is attached. The error from the console logs is DEB ccservice: Reason: SIP;cause=200
All other phones (non-DX models) register fine to the subscriber.
Are there any particular features that need to be enabled on the subscriber for the DX devices?