The Cisco VCS Control provides internal video control and administration for all SIP and H.323
devices. It is normally deployed within your wide area network with endpoints that are behind the
same firewalls or NAT devices.
The Cisco VCS Control replaces the need to have separate H.323 gatekeeper, SIP registrar and
H.323 - SIP gateway servers.

Cisco VCS base applications

Cisco VCS Expressway™

The Cisco VCS Expressway provides standards-based firewall traversal for SIP and H.323 devices
allowing secure firewall traversal of any firewall or NAT device. As well as all the functionality of
a Cisco VCS Control, it also provides registration of traversal-enabled devices and can act as a
standards-based TURN server.
The Cisco VCS Expressway is normally deployed outside of your firewall or within the DMZ.