RADVision SCOPIA XT1000 Piccolo Administrator's Manual page 9

Figure 1-2 Using an HTTP/STUN Server for NAT and Firewall Traversal
This approach works well in simple NAT and firewall traversal deployments, typically used
by home offices and Small Medium Businesses (SMBs).
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Using a NAT/firewall traversal server supporting H.460
The endpoints in the private network communicate with the endpoints located in the
public network via an H.460 NAT/firewall traversal server, like the SCOPIA PathFinder (see
Figure 1-3 on page 6). Endpoints in the public network can join a conference hosted in
the private network via the traversal server if there is an open connection through the
firewall. Verify the duration of the firewall pinhole and configure that time in the XT
Codec Unit.
Having a dedicated NAT/firewall traversal server like the SCOPIA PathFinder offers
external endpoints a static address when joining conferences hosted in your organization.
You can dial 1234@pathfinder.company.com to access from outside the firewall, or you
can dial 1234 directly if you are a H.460 client logged in to the SCOPIA PathFinder Server.
H.460 is an extension of the H.323 protocol used for NAT and firewall traversal, employing
ITU-T standards. The traversal server can be a a SCOPIA PathFinder or a third-party ITU-T
compliant server.
RADVISION | Administrator Guide for SCOPIA XT4000 Series Version 3.0 Planning the Topology of the SCOPIA XT Series Deployment | 5