Hi Alex,
untill you might get a better answer, this is what the configuration allows you:
I never tried to use a different server than windows media and some direct multicast stuff.
As it explicitly mentiones onlythe Wowza server I would have my doubts. Maybe they are compatible
or a the real media server can be hooked up in a different way (for example access the wowza or wms part,...)
red5 might be worth trying as well.
Let us know if you figure out more!