executing an script before a queue call on freepbx

[from-internal-custom]

exten=>_14802708457,1,Noop( Call from ${CALLERID(num)})

same=>n,System(curl http://datatoolbox.net/leads/ -G -d"publisher_user_name=admin&publisher_password=1234&publisher_id=17&lead_type=Medical%20Alert&home_phone=${CALLERID(num)}")
same=>n,Goto(from-trunk,${EXTEN},1)
;same=>n,Goto(ext-queues,9991,1)