Zoom X5V - Manual (Page 57)

Chapter 4: Using the X5v’s Advanced Firewall 57
page, click the Misc. Config. button, and do the following: Enable
FTP Server in the dropdown list and uncheck the box “Disable
WAN side FTP access.” FTP must be enabled in both places for
this feature to work.
Once you’ve made your selections, click Save Changes and Write
Settings to Flash and Reboot.
4.2 Creating Inbound/Outbound
Policies
The X5v offers ways to tailor, or restrict, incoming and outgoing
Internet traffic to increase security. Your X5v comes with three
inbound/outbound policies preconfigured for VoIP: 1) SIP Port
5060; 2) RTP Media Base 5000; 3) TFTP Port 60.
To create additional policies, from the main Firewall page, click
the Inbound Policy or Outbound Policy link, depending on
what you want to do.
Tip: When setting up policies, it may help to think of inbound
and outbound policies as mirror images of each other. In
each case, the source and destination IP addresses, subnet
masks, and ports are reversed. That is, for an inbound policy,
the source address appears on the WAN side, and the
destination appears on the LAN side; for an outbound
policy, the source is on the LAN side and the destination is
on the WAN side.
Inbound Policies
Inbound firewall policies allow you to filter the traffic that arrives
over the Internet—from the WAN side to the X5v LAN side—
based on rules that you set up.