I'm thinking in developing a new module for Freeswitch for commercial use and distribution. It would be a new end point module based in a propietary binary protocol. And here the problem raise, because I'm a bit confusing about MPL license and its implications. Would this module be considered as a derivate work?. 

      If it's considered as a derivate work, is it any kind of commercial license for freeswitch?.

      and the last question, if any of this is possible, could I statically link Freeswitch core or some of its modules in my application if I don't modify its source code?.

Regards,