AVer EVC130 user manual - Manual (Page 59)

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FIREWALL
Configure the following items to setup the Firewall.
Select Network│Firewall and press .
Configure the following relative items to setup
the Firewall.
TCP/UDP Ports
By default, the system communicates through
TCP/UDP ports in the range from 30000 to
30019. You can specify the range for your
specific network environment.
 You must configure your firewall to allow inbound/outbound traffic through TCP ports 1720/1719 for
H.323 call setup.
NAT Configuration
AVer EVC supports NAT systems that use the
internal IP addresses to communicate with
other devices outside the LAN.