Extrema_ExtSS for non parallel Planes

Hello Team!
In my task I tried to use Extrema_ExtSS for obtaining the distance between faces and for two GeomAbs_Plane's it returns non clear for me result. According to the code the algorithm returns the distance only for parallel faces. And I wanted to ask is there another option to obtain the distance between non parallel GeomAbs_Plane faces? It would be perfect if the solution exists within BRepExtrema package.