I'm interested in completely understanding the "flow" of how an incoming connection is routed out to a particular  USB port, as well as what configuration parameters/files are involved.

I've attached it but I think this list strips attachments so you can get it here.

On a side note..

One thing I've see in extensions.conf is 

exten => ${NODE},1,rpt,${NODE}

This would seem like it would keep you from having to write lines for every extension on the local server but things stop working if I just have that line in my radio-secure staza.  Is there a secret to this?

Thanks!