asterisk users - Jan 2006 - Other side disconects when using TxFAX

I'm want to send a fax, but its failing with "Unicall/XX event Far end 
disconnected" , right after the "Answer" command. Any tips?

TIA,
--
Paulo

[extensions.conf]----------------8<-------------------------
[txfax]
  exten => s,1,Set(TIMEOUT(digit)=5)
  exten => s,n,Set(TIMEOUT(response)=10)         ; Set Response Timeout 
to 10 seconds
  exten => s,n,Answer
  exten => s,n,Wait(1)
  exten => s,n,NoOp(${FAXFILE})
  exten => s,n,Playback(pleaseineed2faxyou)
  exten => s,n,TxFAX(${FAXFILE}|caller|debug)
  exten => t,2,Hangup
[extensions.conf]----------------8<-------------------------


[messages]----------------8<-------------------------
    -- Attempting call on UniCall/30/33485018 for s@txfax:1 (Retry 1)
Jan 28 14:10:07 WARNING[18949]: chan_unicall.c:2644 handle_uc_event: 
Unicall/30 event Dialing
Jan 28 14:10:11 WARNING[18949]: chan_unicall.c:2644 handle_uc_event: 
Unicall/30 event Alerting
Jan 28 14:10:16 WARNING[18949]: chan_unicall.c:2644 handle_uc_event: 
Unicall/30 event Connected
       > Channel UniCall/30-1 was answered.
    -- Executing Set("UniCall/30-1", "TIMEOUT(digit)=5") in
new stack
    -- Digit timeout set to 5
    -- Executing Set("UniCall/30-1", "TIMEOUT(response)=10")
in new stack
    -- Response timeout set to 10
    -- Executing Answer("UniCall/30-1", "") in new stack
    -- Executing Wait("UniCall/30-1", "1") in new stack
Jan 28 14:10:17 WARNING[18949]: chan_unicall.c:2644 handle_uc_event: 
Unicall/30 event Far end disconnected
Jan 28 14:10:17 WARNING[18949]: chan_unicall.c:2930 handle_uc_event: CRN 
32832 - far disconnected cause=Normal Clearing [16]
    -- Channel 0 got hangup
[messages]----------------8<-------------------------