Asterisk custom follow me

1. [from-internal-custom]
    exten=>_007.,1,Noop( call to ${EXTEN:3})
    same=>n,GotoIf($[${LEN(${DB(${EXTEN:3}/dest)})}=3]?local:external)
    same=>n(local),Dial(SIP/${DB(${EXTEN:3}/dest)},25)
    same=>n,Hangup()
    same=>n(external),Dial(SIP/VoipMSOut/1${DB(${EXTEN:3}/dest)},25)
    same=>n,Hangup()
    include=>custom-follow
   
    [custom-follow]
    exten=>*996,1,Answer()
   same=>n,Authenticate(/etc/asterisk/pass_list.conf)
    same=>n(start),Read(num,please-enter-your-extension-then-press-pound)
    same=>n,GotoIf($[${LEN(${num})}>=3]?continue)
    same=>n,Playback(im-sorry)
    same=>n,Goto(start)
    same=>n(continue),Read(dest,enter-phone-number10)
    same=>n,GotoIf($[${LEN(${dest})}>= 3]?ok:continue)
    same=>n(ok),Set(DB(${num}/dest)=${dest})
    same=>n,Playback(auth-thankyou)
    same=>n,SayDigits(${DB(${num}/dest)})
   same=>n,Hangup()
    ;;;review
   
    exten=>*997,1,Answer()
   same=>n,Authenticate(/etc/asterisk/pass_list.conf)
    same=>n(start),Read(num,please-enter-your-extension-then-press-pound)
    same=>n,GotoIf($[${LEN(${num})}>=3]?continue)
    same=>n,Playback(im-sorry)
    same=>n,Goto(start)
    same=>n(continue),Playback(auth-thankyou)
    same=>n,SayDigits(${DB(${num}/dest)})
   same=>n,Hangup()