Basic Digit Manipulation

num-exp 4... 4005554...
dial-peer voice 4000 pots
destination-pattern 4005554...
forward-digits all
prfix 1
port 0/1:23
!
dial-peer voice 3000 voip
destination-pattern 3...
session-target ipv4:10.1.1.1
!
dial-peer voice 3001 pots
destination-pattern 3...
prefix 13005553
preference 1
port 0/1:23