You must provide us with a telephone number (preferably a mobile number) at which you will be contactable during and outside of working hours.
So has CASA changed their interpretation of "free of all duty" then? The last CASA interpretation I heard on this matter was that if you were required to be contactable that was considerd duty and was to be logged as such. I recall a Chief Pilot years ago being busted by CASA for this very offence!!