Password for mobile calls

I´m installing a trixbox and configure my extensions, but i need to put a password for a extensions who is going to call for a mobline phonex they start with number 7,8and 9.

Someone can help me?

Sorry my poor english

Thanks in advance.

Very ease use separate outbound route for Mobile calls, and use password protected route, or use PINs for this

Ok, I undestend but now, how can I restrict my first outbond route to make calls for mobile, and how can I use PINs.

Thanks again.