Cisco Cisco TelePresence Video Communication Server Expressway
Network elements
Internal network elements
The internal network elements are devices which are hosted on the organization’s local area network.
Elements on the internal network have an internal network domain name. This internal network domain name
is not resolvable by a public DNS. For example, the VCS Control is configured with an internally resolvable
name of vcsc.internal-domain.net (which resolves to an IP address of 10.0.0.2 by the internal DNS servers).
is not resolvable by a public DNS. For example, the VCS Control is configured with an internally resolvable
name of vcsc.internal-domain.net (which resolves to an IP address of 10.0.0.2 by the internal DNS servers).
VCS Control
The VCS Control is a SIP Registrar & Proxy and H.323 Gatekeeper for devices which are located on the
internal network.
internal network.
EX90 and EX60
These are example endpoints hosted on the internal network which register to the VCS Control.
DNS (local 1 & local 2)
DNS servers used by the VCS Control, to perform DNS lookups (resolve network names on the internal
network).
network).
DHCP server
The DHCP server provides host, IP gateway, DNS server, and NTP server addresses to endpoints located
on the internal network.
on the internal network.
Cisco TMS server
).
Syslog server
).
NTP server
An NTP server which provides the clock source used to synchronize devices.
SIP and H.323 domain
The example deployment is configured to route SIP (and H.323) signaling messages for calls made to URIs
which use the domain example.com.
which use the domain example.com.
.
Cisco TelePresence Video Communication Server Basic Configuration (Single VCS Control) Deployment
Guide (X8.2)
Guide (X8.2)
Page 4 of 30
Introduction