Networks
Polycom, Inc. 2–23
2 Configure these settings on the Firewall screen:
Setting Description
Fixed Ports Lets you specify whether to define the TCP and UDP ports.
• If the firewall is not H.323 compatible, enable the Fixed
Ports setting. The Polycom HDX system assigns a
range of ports starting with the TCP and UDP ports you
specify, as shown in the following note.
Note: You must open the corresponding ports in the
firewall. In addition:
— For H.323 you must open the firewall’s TCP port
1720 to allow incoming calls.
— For SIP, open the following ports depending on the
configuration of the SIP Transport Protocol setting:
• UDP: 5060
• TCP: 5060
• TLS: 5061
• If the firewall is H.323 compatible or the system is not
behind a firewall, disable this setting.
TCP Ports
UDP Ports
Lets you specify the beginning value for the range of TCP
and UDP ports used by the system when the Fixed Ports
setting is enabled. The system automatically calculates the
ending value for the range based on the beginning value
you set. The ranges are as follows:
• TCP Ports: 6-port range, default starting port is 3230
(default range is 3230-3235)
• UDP Ports: 51-port range, default starting port is 3230
(default range is 3230-3280)
Enable H.460
Firewall Traversal
Allows the system to use H.460-based firewall traversal for
IP calls. For more information, refer to H.460 Firewall/NAT
Traversal on page 2-24.
NAT Configuration Lets you specify whether the system should determine the
NAT Public WAN Address automatically.
• If the system is not behind a NAT or is connected to the
IP network through a Virtual Private Network (VPN),
select Off.
• If the system is behind a NAT that allows HTTP traffic,
select Auto.
• If the system is behind a NAT that does not allow HTTP
traffic, select Manual.
NAT Public (WAN)
Address
Displays the address that callers from outside the LAN use
to call your system. If you chose to configure the NAT
manually, enter the NAT Public Address here.
NAT is H.323
Compatible
Specifies that the system is behind a NAT that is capable of
translating H.323 traffic.
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