Polycom VSX Series Manual De Usuario

Administrator’s Guide for the VSX Series

3 - 18

You can configure VSX systems to use standards-based H.460.18 and H.460.19 

firewall traversal, which allows 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 V

2

IU™ 

traversal server gateway is on the edge of the service provider network and 

facilitates IP calls between VSX systems behind different firewalls.

To use this traversal, VSX systems and firewalls must be configured as follows:

• Enable firewall traversal on the VSX system.

• Register the VSX system to an external V

2

IU Traversal Server Gateway 

that supports the H.460.18 and H.460.19 standards.

• Make sure that firewalls being traversed allow VSX systems behind them 

to open outbound TCP and UDP connections. 
— Firewalls with a stricter rule set should allow VSX systems to open at 

least the following outbound TCP and UDP ports: 1720 (TCP), 

14085-15084 (TCP) and 1719(UDP), 16386-25386 (UDP). 

— Firewalls should permit inbound traffic to TCP and UDP ports that 

have been opened earlier in the outbound direction. 

• For best interoperability, make sure that H.323 protocol-aware features are 

disabled on firewalls being traversed. 

Go to System > Admin Settings > Network > IP > Firewall > Next.

Select Enable NAT/Firewall Traversal.

Gatekeeper

System with 

V

2

IU Server Gateway

Traversal Enabled

System with 
Traversal Enabled

that Supports H.460.18
and H.460.19