Exporting to Autodesk Softimage

Hello i am a beginning animator/rigger that just started using blender.
I find rigging much easier in blender but i prefer animating in softimage but recently i got an issue with importing and exporting models.
I rigged a demon character in blender but when i export i get that my bones have dissapeared and all the joints have been replaced by some axysses
Now my question is: What is the best way to export rigs to softimage from blender and/or is there a way to get the bones back in my model in softimage.