exten => _X.,1,NoOp
exten => _X.,2,Set(CALLERID(number)=$[${CALLERID(number):0:11}])
exten => _X.,3,GotoIF($[${CALLERID(number)} = NX.]?6:4)
exten => _X.,4,Dial(${TRUNK1}/${EXTEN})
exten => _X.,5,Congestion
exten => _X.,6,Set(CALLERID(number)=$[${CALLERID(number):1}])
exten => _X.,7,NoOP(${CALLERID(number))
exten => _X.,8,Dial($TRUNK1/${EXTEN})