Adding Route and IP Tables

In NET+OS 7 API Reference I can’t find information on adding static routes or using IP Tables in TRECK IP stack, only PPPAddStaticRoute() for serial PPP interfaces. Where can I find these informations and/or work-arounds to manipulate IP routing?
Thanks for any hints [:D]

NET+OS does not contain any APIs for manipulating the routing tables. A default route (gateway) is set up at device startup and that remains the route of choice.