Cisco Cisco TelePresence Video Communication Server Expressway
External network elements
EX60
An example remote endpoint, which is registering to the VCS Expressway via the internet.
DNS (Host)
The DNS owned by service provider which hosts the external domain example.com.
DNS (external 1 & external 2)
The DNS used by the VCS Expressway to perform DNS lookups.
NTP server pool
An NTP server pool which provides the clock source used to synchronize both internal and external devices.
NAT devices and firewalls
The example deployment includes:
n
NAT (PAT) device performing port address translation functions for network traffic routed from the internal
network to addresses in the DMZ (and beyond — towards remote destinations on the internet).
network to addresses in the DMZ (and beyond — towards remote destinations on the internet).
n
Firewall device on the public-facing side of the DMZ. This device allows all outbound connections and
inbound connections on specific ports. See
inbound connections on specific ports. See
.
n
Home firewall NAT (PAT) device which performs port address and firewall functions for network traffic
originating from the EX60 device.
originating from the EX60 device.
n
with a static NAT and Dual Network Interface architecture.
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.
n
DNS SRV records are configured in the public (external) and local (internal) network DNS server to enable
routing of signaling request messages to the relevant infrastructure elements (for example, before an
external endpoint registers, it will query the external DNS servers to determine the IP address of the VCS
Expressway).
routing of signaling request messages to the relevant infrastructure elements (for example, before an
external endpoint registers, it will query the external DNS servers to determine the IP address of the VCS
Expressway).
n
The internal SIP domain (example.com) is the same as the public DNS name. This enables both registered
and non-registered devices in the public internet to call endpoints registered to the internal and external
infrastructure (VCS Control and VCS Expressway).
and non-registered devices in the public internet to call endpoints registered to the internal and external
infrastructure (VCS Control and VCS Expressway).
.
Cisco TelePresence Video Communication Server Basic Configuration (Control with Expressway) Deploy-
ment Guide (X8.2)
ment Guide (X8.2)
Page 7 of 65
Introduction