How does a VCS Expressway solution work?

A.
Packets sent through a firewall are tagged by VCS Expressway and control, so they can
travel through any port.

B.
The VCS control and Expressway have manually configured IP addresses and ports that
the firewall has opened in both directions.

C.
Packets from expressway to the VCS control are only sent on the return path of an
outbound connection

D.
All incoming data sent through VCS Expressway is delivered to the VCS control through
a single port