exten => s,1,Answer
exten => s,n,SetMusicOnHold(default)
exten => s,n,DigitTimeout,5
exten => s,n,ResponseTimeout,10
exten => s,n,Background(welcome-getpro)
exten => s,n,Background(press-1)
exten => s,n,Background(press-2)
exten => s,n,Background(press-3)
exten => s,n,Background(press-4)

exten => 1,1,NoOp(User pressed 1)
exten => 1,n,Playback(sales)

exten => 2,1,NoOp(User pressed 2)
exten => 2,n,Playback(whatever)

etc