Asterisk MYSQL Caller ID lookup

 [cidlookup]
exten=>_x.,1,Noop( checking the callerid ${CALLERID(num)})
same=>n,Set(__cid=${SHELL(mysql --user=root --password='12340' --skip-column-names  dialer -e 'select dnc_phone  from dnc where dnc_phone="${CALLERID(num)}" limit 0,1 ')})
same=>n,Noop( result ${cid:0:3})
same => n,GotoIf($["${CALLERID(num)}"="${cid:0:3}"]?allow:disallow)
same=>n(allow),Playback(demo-thanks)
same=>n,Hangup()
same=>n(disallow),Playback(im-sorry)
same=>n,Hangup()