It is always good to include and compile all the production team members on the CALL SHEETS.
Indicate on the chart the whereabouts of all production personnel, in the event they are wanted on location or On-Set.
The abbreviation O/C stand for On-Call, which means when they are wanted, please call them.
Do not print the phone numbers on the Call Sheets but centralised in a designated folder or software. The AD or Producer should be the parties who have these info.