[Freeswitch-users] fax and jpg to tiff

sorry I don't have the personal email of Steve Underwood (I saw a thread of him related of this subject), it's about a problem of spandsp txfax and jpeg files. I didn't succeed to find the right conversion to make the far end accept the fax. I get always "far end cannot receive at the size of the image". this problems occurs only from jpeg to tiff conversion. I use imagemagick for that : sudo /usr/bin/convert -page Letter -density 204x196 -resize 1728x1184 -units pixelsperinch -monochrome -compress Fax <fileToConvert> <fileToSave> I tried numrous options but no luck. Thanks