asterisk users - May 2010 - Faxes from website works, but from regular don't: cause 16

Hi Guys,
I'm having a non-obvious issue, i am using Fax for asterisk to receive
faxes, so when i test using a website that send faxes it's working great:
the fax is received and the fax2mail app is called and i get it in my email
box. but when i try using a regular fax machine everything in logs (turned
on debug) but all of the sudden a line appear saying:
Channel 0/1, span 1 got hangup request, cause 16
and then the fax2mail is not called for some reason and [image: :(] no fax
received, can you help me guys with that?
thanks!!!

-- 
Abdullah
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