Streaming from private server with Direct Publisher

Stream content from a private network to a public network?  

Unless the user is VPNed in, no...or, your network is setup to route traffic JUST TO the server that is serving up the media (a "tunnel").  Your firewall can be configured to allow traffic on that port.

Thats alot of work for a Direct Publish channel.  You'd be better severed trying to get something professionally coded against the API.

You can also make the channel private...e.g. "security through obscurity".