url callback for server not in dmz

I'm setting up the url callback.  My OneSpanSignConnector service is located on a service in the internal network not the DMZ.

This is how I was going to set it up:

  traffic coming from:   sandbox.esignlive.com
                                   inbound http & https (80 & 443) traffic 

           to:  www.xyz.com
  route to: internal server ip addess using a NAT (network address translation)

so my url callback configuration would be:

    http://www.xyz.com/OneSpanSignConnector service/api/Notify 

Will this work?
Thanks