Problem with feature codes

Good day, everyone!

I have asterisk and FreePBX

In section feature codes see the list of allowed codes are all working, everything is fine. But it found such a peculiarity / bug - for example using the code * 72 (call forwarding by default) I can put call forwarding from my phone to any extension - just after dialing * 72 does not enter my number(extension), but enter any other number(extension) and it works. As I understand it Admin features code.

how allow to use this feature only admin (because by default it is accessible to all)?
in this case, ordinary users will be able to use call forwarding?

p.s. sorry for my english - i use google

anyone ?