[cisco-voip] onramp config problem

[Stift]

Hi,

I try to configure onramp faxing on a 2821. When I do test call to the 
onramp fax number I can hear the well known fax sounds, but when I try 
to test it with a real fax machine nothing happens, no q931 debug output 
, and on the fax machine I receive a busy signal. What I made wrong?