[fax-in]
exten => s,1,Set(FAXFILE=/var/spool/astersik/fax/i${CALLERIDNUM}-${TIMESTAMP}.tif)
exten => s,2,rxfax(${FAXFILE})
exten => t,1,hangup




[default]
exten => s,1,Goto(fax-in,s,1)


    -- Starting simple switch on 'Zap/2-1'
Aug 10 15:16:50 NOTICE[23450]: chan_zap.c:6057 ss_thread: Got event 18 (Ring Begin)...
Aug 10 15:16:52 NOTICE[23450]: chan_zap.c:6057 ss_thread: Got event 2 (Ring/Answered)...
    -- Executing Goto("Zap/2-1", "fax-in|s|1") in new stack
    -- Goto (fax-in,s,1)
    -- Executing Answer("Zap/2-1", "") in new stack
    -- Executing Set("Zap/2-1", "FAXFILE=/var/spool/astersik/fax/i-20060810-151652.tif") in new stack
    -- Executing RxFAX("Zap/2-1", "/var/spool/astersik/fax/i-20060810-151652.tif") in new stack
Aug 10 15:16:54 NOTICE[23450]: chan_zap.c:4661 zt_read: Fax detected, but no fax extension
    -- Executing Hangup("Zap/2-1", "") in new stack
  == Spawn extension (fax-in, s, 4) exited non-zero on 'Zap/2-1'
    -- Hungup 'Zap/2-1'