[incoming]

exten => s,1,Answer
exten => s,2,Background(hawaii)
exten => s,3,Set(TIMEOUT(response)=5)
exten => s,4,Set(TIMEOUT(digit)=5)

exten => i,1,Goto(s,3)

exten => t,1,Dial(Zap/1,30,t)
exten => t,2,Hangup

exten => fax,1,Set(FAXFILE=/var/spool/asterisk/fax/${UNIQUEID}.tif)
exten => fax,2,RxFax(${FAXFILE})
exten => fax,3,Hangup