No jumps needed. Of course the RF control tab has to refer to each device and the base station it is connected to.
Try some longer delays when you are going from one the station to the other. URC base stations sometimes get confused by stray RF that is being sent to the other one, and have to settle down for just a moment before taking new commands.
There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions.