Extension Rules ? possible

Hi I am gradually getting a Trixbox install ready for an office environment.
The office has 6 POTS lines and 24 extensions.

I have 2 Questions I need help with:

** 1. Do extension Rules exist. (see explaination)

the existing system has different extenions with different rules.
for example

Office 1 can call all numbers
Office 2 cannot call 0011
Office 3 cannot call 0011 and mobiles
Office 4,5,6 cannot call inter state or 0011 or mobiles
Office 7 cannot make out going calls.

is there any nice trixbox module or whatnot that i can put rules on extenisons?

** 2. BLF recommendations please

The current old phone system has BLF.
it shows the status of ALL the lines and ALL the extensions.
I can pick up a POTS that has been put on hold. etc.

What is the best IP phone to replicate this sort of thing?
Aastra 57i ???

Your comments would be much appreciated
Thanks
Thomas