Cisco Cisco TelePresence Video Communication Server Expressway
Introduction
Cisco VCS Deployment Guide: Basic configuration – VCS Control with VCS Expressway
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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 Cisco 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).
name is not resolvable by a public DNS.
For example, the Cisco 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).
Cisco VCS Control
The Cisco VCS Control is a SIP Registrar & Proxy and H.323 Gatekeeper for devices which are located
on the internal network.
on the internal network.
The Cisco VCS Control is configured with a traversal client zone to communicate with the Cisco VCS
Expressway in order to allow inbound and outbound calls to traverse the NAT device.
Expressway in order to allow inbound and outbound calls to traverse the NAT device.
E20 and MXP1700
These are example endpoints hosted on the internal network which register to the Cisco VCS Control.
DNS (local 1 & local 2)
DNS servers used by the Cisco VCS Control, to perform DNS lookups (resolve network names on the
internal network).
internal network).
DHCP server
The DHCP server provides host, IP gateway, DNS server, and NTP server addresses to endpoints
located on the internal network.
located on the internal network.
Router
The router device acts as the gateway for all internal network devices to route towards the DMZ (to the
NAT device internal address).
NAT device internal address).
Syslog server
A logging server for Syslog messages (see
).
Cisco TMS server
A management and scheduling server (see
).
DMZ network element
Cisco VCS Expressway
The Cisco VCS Expressway is a SIP Registrar & Proxy and H.323 Gatekeeper for devices which are
located outside the internal network (for example, home users and road warriors registering across the
internet and 3
located outside the internal network (for example, home users and road warriors registering across the
internet and 3
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party businesses making calls to, or receiving calls from this network).
The Cisco VCS Expressway is configured with a traversal server zone to receive communications from
the Cisco VCS Control in order to allow inbound and outbound calls to traverse the NAT device.
the Cisco VCS Control in order to allow inbound and outbound calls to traverse the NAT device.
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The Cisco VCS Expressway has a public network domain name.
For example, the Cisco VCS Expressway is configured with an externally resolvable name of
vcse.example.com (which resolves to an IP address of 192.0.2.2 by the external / public DNS
servers).
For example, the Cisco VCS Expressway is configured with an externally resolvable name of
vcse.example.com (which resolves to an IP address of 192.0.2.2 by the external / public DNS
servers).
External network elements
MXP1000