Hi Michael,
If your goal is to have your users dial 9 when dialing external numbers, then just create dial-peers for outbound calls with the leading 9 in the destination pattern statement. Eg.
!
dial-peer voice 11 pots
description * Outbound LD Calls *
destination-pattern 91[2-9]..[2-9]......
forward-digits 11
port x/x
!
Hope this helps.
Regards,
Michael.