asterisk users - Oct 2008 - ATA hangs up with fax detection on...

I have a weird problem with a client.  I recently upgraded to Asterisk
1.4.22 and Zaptel 1.4.12.1 on their server and now there is a problem
when a fax call is received.

	Basically when faxdetect=incoming is set in zapata.conf the call comes
in and the fax extension dials a Linksys PAP2T where a fax machine is
connected.  The fax answers and almos immediately it hangs up and I get
this:

    -- Executing [fax at default:1] Dial("Zap/2-1",
"SIP/5001") in new
stack 
    -- Called 5001 
    -- Got SIP response 486 "Busy Here" back from 192.0.0.14 
    -- SIP/5001-09495388 is busy 
  == Everyone is busy/congested at this time (1:1/0/0) 

	If I set faxdetect=no then I can dial extension 5001 and the fax is
received without problems.  Any idea why fax detection would interfere
with the PAP2T?

-- 
?Telecomunicaciones Abiertas de M?xico S.A. de C.V.
Carlos Ch?vez Prats
Director de Tecnolog?a
+52-55-91169161 ext 2001
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