That's correct. Please always use the vACC charts and frequencies.
Switzerland /
Austria
It is very easy for the ATC Area of responsability. It's the same for the DEP/ARR - Airport:
If there is no ATCo online use unicom 122.8 (only text, no voice)
If DEL is online -> only responsible for the IFR-CRL
If _GND is online -> taxi-CLR, if no DEL then also for the IFR-CLR
If _TWR is online -> DEP-CLR and Landing-CLR (responsible for a Control Zone), if no DEL/GND then also for the IFR-CLR and Taxi
If _APP is online -> responsible for a TMA around an airport, if no DEP then also for Departures in the TMA. If no DEL/GND/TWR, then also responsible for IFR-CLR, Taxi, Dep, Arr
IF _CTR is online -> responsible for a whole FIR, if no DEL/GND/TWR/APP online, then responsible for everything in his area.
stay on unicom 122.8 till.....
... APP online -> around 50 NM of the airport or 5-10 minutes before reaching the first point of the STAR or you will receive a contact me
... TWR online -> established on the ILS
... GND online -> after vacating the rwy, only for taxi clr to the gate