H.460 NAT Firewall Traversal

You can configure RealPresence ITP systems to use standards-based H.460.18 and H.460.19 firewall traversal, which enables video systems to more easily establish IP connections across firewalls.

The following illustration shows how a service provider might provide H.460 firewall traversal between two enterprise locations. In this example the Polycom Video Border Proxy™ (VBP®) firewall traversal device is on the edge of the service provider network and facilitates IP calls between RealPresence ITP systems behind different firewalls.


  1. Enable firewall traversal.
    1. Go to Admin Settings > Network > IP Network > Firewall.
    2. Select Enable H.460 Firewall Traversal.
  2. Register the system to an external Polycom VBP device that supports the H.460.18 and H.460.19 standards.
  3. Make sure that firewalls being traversed allow the RealPresence ITP system behind them to open outbound TCP and UDP connections.
    • Firewalls with a stricter rule set should allow the RealPresence ITP system to open at least the following outbound TCP and UDP ports:
      • (TCP)

      • 14085-15084 (TCP)

      • (UDP)

      • 16386-25386 (UDP)

    • Firewalls should permit inbound traffic to TCP and UDP ports that have been opened earlier in the outbound direction.