Polycom G7500 Reference Manual page 51

The system assigns a port range starting with the TCP and UDP ports you specify (port 3230 is
where the range begins by default).
To allow H.323 traffic, you need two TCP and eight UDP ports per connection. You must also
open TCP port 1720 on the firewall.
To allow SIP traffic, you need TCP port 5060 and eight UDP ports per connection.
Fixed ports range and filters: You might notice that the source port of a SIP signaling message is
not in the fixed ports range. When your firewall is filtering on source ports, in the system web
interface, set voIpProt.SIP.forceConnectionReuse="1". When enabled, the system uses port
5060 and 5061 for the source and destination port (these must be open on the firewall).
Integer (1024-65522)
3230 (default)
net.firewall.fixedPorts.udpStart
The starting value for the range of UDP ports used by the system. The system automatically
configures the range based on the beginning value you set here.
To allow H.323 traffic, you need two TCP and eight UDP ports per connection. You must also
open TCP port 1720 on the firewall.
To allow SIP traffic, you need TCP port 5060 and eight UDP ports per connection.
Because systems support ICE, the range of fixed UDP ports is 32. The system cycles through
the available ports from call to call.
Fixed ports range and filters: You might notice that the source port of a SIP signaling message is
not in the fixed ports range. When your firewall is filtering on source ports, in the system web
interface, set voIpProt.SIP.forceConnectionReuse="1". When enabled, the system uses port
5060 and 5061 for the source and destination port (these must be open on the firewall).
Integer (1024-65424)
3230 (default)
net.firewall.h460.enable
Allows the system to be configured for H.460 firewall/NAT traversal.
0 (default)
1
net.firewall.nat.gabAddressDisplayed
Sets whether to display the system's public or private address in the global directory.
To use this parameter, make sure net.firewall.nat.useNatAddress is set to "Auto" or "Manual".
Public (default)
Private
net.firewall.nat.h323Compatible
Identifies whether the system is behind a NAT that can translate H.323 traffic.
To use this parameter, make sure net.firewall.nat.useNatAddress is set to "Auto" or "Manual".
0 (default)
1
net.firewall.nat.publicAddress
Polycom, Inc.
Network Parameters
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