Yes, you can do that but it is system wide and done in the system. Under Expert mode, Basic settings, System, Flexible menu you can remove options from the service menu. They can still dial the codes if they know them or you can remove them via the service codes option.
I DISABLE ALL FEATURE FROM FLEXIBLE MENU IN EXPERT MODE IN CP600 AND CP400 STILL APPEAR ONE FEATURE NIGHT FORWARDING I CAN'T FIND A WAY TO DISABLE IT BUT IN CP200 WHEN I CLICK MENU BUTTON I CAN ACCESS A LOT OF SERVICES AND I COULDN'T FIND TRICK TO HIDDEN IT
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