| Traditional Deployment Methods | 44
Public IP Configuration
If you have a high expectation for the audio and video quality, you can connect your video conferencing
system to the Internet directly.
This deployment method involves a simple setup process but creates a stable network environment.
However, it is more expensive due to leased line costs. This method is often used in the head office.
NAT
Many application-layer protocols, for example multimedia protocols (H.323/SIP), have the address or the
port information. The address and port information included in the H.323/SIP protocol cannot be translated
via the traditional NAT method, which leads to communication problems.
ALG (application layer gateway) feature on the router/firewall can help translate the address and the port of
application-layer protocols, which guarantees the accuracy of the communication in the application layer.
If your router does not support ALG feature, you should configure port forwarding on your router first, and
then enable static NAT feature on your system. It can help convert the internal network address and port
carried in the H.323/SIP payload to the public network address and port when communicating with the
internal and external networks.
Note:
If H.460 firewall traversal is enabled on the system, the system will automatically ignore the static
NAT settings for H.323 calls. For more information, refer to Configuring H.460 for H.323 Protocol .
• Port Forwarding
• Configuring NAT
• Enabling Static NAT Feature for SIP Protocol(SIP Account and SIP IP Call)
• Configuring Route Traversal
Port Forwarding
The most common scenario is deploying the VCS in an intranet (behind a firewall). You must assign a static
private IP address to the VCS. In the meantime, do port forwarding on the firewall.
Port forwarding is an application of network address translation (NAT) that redirects a communication
request from one address and port number combination to another while the packets are traversing a
network gateway, such as a router or firewall.
To receive a public-to-private call, you must forward the following ports to the public network on your
router or firewall.
Description Port Range Port Type
H.323 1719-1720 UDP/TCP
Control and media for audio,
video, content, and data/FECC
50000-51000 TCP/UDP
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