exten => _9NXXXXXX,1,Set(DATE=${DATETIME:0:8})
exten => _9NXXXXXX,n,Monitor(wav,${CALLFILENAME},m)
exten => _9NXXXXXX,n,Dial(ZAP/g1/1480${EXTEN:1})

EXTEN:1 cause i require a 9 so it just says add 1480 to the other 7 digits !